Go to a  "printer friendly" view of this message which allow an easy print Printer-friendly copy Go to the page which allows you to send this topic link and a message to a friend Email this topic to a friend
Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D7100, D7000 (Public) topic #33569
View in linear mode

Subject: "7100, 300 f/4 and 1.4x Focussing Issue" Previous topic | Next topic
brada Silver Member Nikonian since 29th Jan 2008Fri 18-Apr-14 02:47 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
"7100, 300 f/4 and 1.4x Focussing Issue"


US
          

I have a D7100 and D300, 300 f/4 and the current 1.4x.
I am having repeated issues with the D7100, 300, 1.4x and focussing. It will work for a while, stop focussing and start working again. If I cleaned the contacts, this would clear up the problem for a a little while. It would work for a couple of months between cleanings, then less and recently only a 1 week ( roughly 2000 shots) before it stopped focussing entirely. Right after not working on D7100, connected to my D300 it worked fine with no issues. If I take off the 1.4, the D7100 and 300 f/4 works flawlessly.

Do you think this is a 1.4x or D7100 issue?

Thank you,
Brad

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

Replies to this topic
Subject Author Message Date ID
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
bgs Administrator
19th Apr 2014
1
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
20th Apr 2014
2
     Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
Leonard62 Gold Member
20th Apr 2014
3
          Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
20th Apr 2014
4
          Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
Leonard62 Gold Member
20th Apr 2014
6
          Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
JosephK Silver Member
20th Apr 2014
7
               Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
Leonard62 Gold Member
20th Apr 2014
10
               Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
Webbo51
24th Apr 2014
16
          Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
Webbo51
24th Apr 2014
15
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
jbloom Gold Member
20th Apr 2014
5
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
20th Apr 2014
9
     Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
billD80 Silver Member
22nd Apr 2014
13
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
factotum
20th Apr 2014
8
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
20th Apr 2014
11
     Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
Montereyman Silver Member
22nd Apr 2014
12
          Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
23rd Apr 2014
14
               Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
Lunastar Silver Member
29th Apr 2014
17
                    Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
29th Apr 2014
18
                         Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
km6xz Moderator
03rd May 2014
19
                              Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
09th May 2014
21
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
radkrishr Gold Member
06th May 2014
20
Reply message RE: 7100, 300 f/4 and 1.4x Focussing Issue
brada Silver Member
09th May 2014
22

bgs Administrator One of the two c-founders, expert in several areas Awarded for his valuable Nikon product reviews at the Resources Charter MemberSat 19-Apr-14 10:32 PM
5442 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#1. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 0


Bratislava, SK
          

Brad,

Some thoughts;

Possibility 1: It is an optical issue and not enough light is transmitted to the camera for the AF to work properly. You should check all optical surfaces to ensure they are clean and dust free.

Possibility 2 (I think this is unlikely though): It is an electronic issue and the voltage drop through the tele-converter is large enough to cause this to happen. You cleaning contacts may indicate that this is the case. If (1) does not help, it might help with using a proper contact cleaner, available from e.g. electronics/hardware stores.

Is this a Nikon 1.4x or a third party tele-converter?

Bo Stahlbrandt. Nikonians Founder and Administrator located in Bratislava/Slovakia and in the Black Forest/Germany.
Find out more about The Nikonians Team -- See the latest, hottest posts

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

    
brada Silver Member Nikonian since 29th Jan 2008Sun 20-Apr-14 03:55 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#2. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 1


US
          

This is the Nikon version.
This issue happens in all conditions including bright light.
I have cleaned the contacts multiple times including a cleaner from an electronics store.
I went out yesterday morning, tested at the house, it seem to focus fine. When I got to my local bird sanctuary, it wouldn't focus for 1 photo. Attached the 300/1.4 combo on my D300 and was able to shoot all day. If I used just the 300 on the 7100, it worked great.

Another interesting issue… I was shooting a hawks nest from a fair distance but still within reason for a nice photograph. A LOT of the photos came out of focus, verifying in ViewNX, the square is clearly on the subject, but the leaves and moss a couple of feet behind are in perfect focus. When in 1.3 crop mode, the issue rarely happened. Used both 9 and 21 point focussing, but unfortunately the software does not say which was used. If I focussed lower, the accuracy was much better. If I am focussing on a closer subject, the focus seems to be dead on. Is this something I can adjust?

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

        
Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Nikonian since 15th Mar 2009Sun 20-Apr-14 04:48 PM
2956 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#3. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 2
Sun 20-Apr-14 04:51 PM by Leonard62

Hatboro, Pa, US
          

What you're seeing is the AF sensor area is spilling over onto the background and focusing there.

Here's an example. The 1st photo has a little spill over causing the main object to be out of focus. The red square is the focus area as reported by CNX2.

In the 2nd photo the focus area was moved ever so slightly so there is no spillover. The main object is now in perfect focus.





Both photos were taken using LiveView and built in flash. The camera was tripod mounted. The lens used was the AFS 24-120mm f4 lens set to f5.6. The camera was 9 feet from the target. The camera was the D7100.

Len


Visit my Nikonians gallery.

Attachment #1, (jpg file)
Attachment #2, (jpg file)

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

            
brada Silver Member Nikonian since 29th Jan 2008Sun 20-Apr-14 05:05 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#4. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 3


US
          

Thanks for the example!
I wonder why the focus gravitates to the background even though there is not much exposed, probably less than 20%. I photograph a lot of birds, perhaps I should use live view and a loupe more often.
I did not notice this situation as much with my D300

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                
Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Nikonian since 15th Mar 2009Sun 20-Apr-14 05:19 PM
2956 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#6. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 4


Hatboro, Pa, US
          

I think it gravitates to the back because there is nothing in front to focus on. In the case of a bird in a tree and a small branch in front it may focus on the branch even though the sensor is mostly covering the bird.

Len

Visit my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                
JosephK Silver Member Fellow Ribbon awarded for his excellent and frequent contributions and sharing his in-depth knowledge and experience with the community in the Nikonians spirit. Nikonian since 17th Apr 2006Sun 20-Apr-14 05:31 PM
4211 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#7. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 4


Seattle, WA, US
          

The focus points are actually bigger than marked. In this case, the part of the sensor over the bear is having problems because there is not much contrast and the bear is fuzzy to start with. The address plate in the back is a great focus target: lots of contrast and straight lines. The part of the AF sensor over it took control.

When the AF sensor was moved to cover only the bear, now the camera and photographer agreed on what the subject was.

---------+---------+---------+---------+---------+
Joseph K
Seattle, WA, USA

D700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II, TC20e3,
50mm f/1.4 D, 70-300mm f/4.5-5.6 VR, 18-70mm f/3.5-4.5 DX

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                    
Leonard62 Gold Member Awarded for excellent contributions and sharing his in-depth knowledge and experience with the community, especially of Nikkor Lenses Nikonian since 15th Mar 2009Sun 20-Apr-14 05:48 PM
2956 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#10. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 7


Hatboro, Pa, US
          

I think you're right Joseph. But it does illustrate a common problem which is reported a lot here.

Len

Visit my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                    
Webbo51 Registered since 27th Feb 2014Thu 24-Apr-14 03:31 AM
10 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#16. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 7


Brisbane, AU
          

Thanks Joseph, great explanation.
Steve

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

            
Webbo51 Registered since 27th Feb 2014Thu 24-Apr-14 03:29 AM
10 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#15. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 3


Brisbane, AU
          

Thanks Len, though not the original poster, this has helped me too.
Steve

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

jbloom Gold Member Awarded for the continuous and generous sharing of his high level expertise and his always encouraging comments in several forums. Nikonian since 15th Jul 2004Sun 20-Apr-14 05:09 PM
6166 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#5. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 0
Sun 20-Apr-14 05:10 PM by jbloom

Wethersfield, US
          

Does the 1.4 TC work reliably on your D7100 with a lens other than the 300/4? Perhaps your 70-200? If it does, and it's only the combination of 300/4, TC and D7100 that fails, you probably need to send all three to Nikon to look at it.

I saw something a little similar a couple years ago where a lens didn't work reliably with a TC, although in my case it was the same on all bodies. Ultimately, Nikon replaced the mount on the lens and that solved the problem.

-- Jon
Wethersfield, CT, USA
Connecticut High School Sports Photos

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

    
brada Silver Member Nikonian since 29th Jan 2008Sun 20-Apr-14 05:44 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#9. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 5


US
          

GREAT QUESTION!

I did a quick test with the 70-200 and it seems to be working good.
I am not wild about sending all 3 to Nikon… could be a pricey adventure and time consuming.

Any thoughts on why it works without any issues on my D300?

I am headed to MN for a long weekend of shooting the first weekend of May and have decided to rent the new 80-400. Don't feel like traveling with lens concerns. I prefer to use the D7100 for multiple reasons (pixels and noise) over the D300. Might have to wait for the summer when there is a gap in birding activity.

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

        
billD80 Silver Member Nikonian since 22nd Jan 2007Tue 22-Apr-14 09:02 PM
2141 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#13. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 9
Tue 22-Apr-14 09:04 PM by billD80

US
          

>Any thoughts on why it works without any issues on my D300?

Yes. I'm thinking the alignment of the D7100 contacts is fractionally at issue, and the contact integrity with the 300mm and the tele-converter can be compromised.

The 300mm is a weighty lens, and the total system integrity with a tele-converter attached isn't as good as a straight lens. That's why the problem appears after time. Cleaning helps because slightly less flush connection may be extended via super-clean contacts (for a while).

That's why, as you indicated, it works for a couple of months after a cleaning, then acts up again. When the focus just stops working, the connection tolerance has probably been exceeded.

So, I think the D7100 body is the item very slightly out of alignment...

www.billkeane.zenfolio.com

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

factotum Registered since 17th Jun 2007Sun 20-Apr-14 05:44 PM
342 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#8. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 0


US
          

This lens/TC combo sometimes drives my D90 batty. I jus turn the camera off and when I turn it back on, it works. The lens works fine without the TC. The problem presents itself sporadically, and I just live with it. I think I once removed and replaced the setup on the camera to clear it.

I never considered it a big thing, and restarting the camera has always cleared it.

"Beauty is in the eye of the beholder and it may be necessary from time to time to give a stupid or misinformed beholder a black eye."
Miss Piggy

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

    
brada Silver Member Nikonian since 29th Jan 2008Sun 20-Apr-14 05:56 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#11. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 8


US
          

Wish I could just turn it off and on… when it is not working (like now), I have tried cleaning all 3, off and on, lens off and on, TC off and on. Sometimes I wonder if it is related to the aperture ring.

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

        
Montereyman Silver Member Nikonian since 18th Feb 2013Tue 22-Apr-14 07:36 PM
96 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#12. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 11


prunedale, US
          

From your description it sounds like a problem with the teleconverters contacts or internal wiring connection. I would check for end to end signal pass through with an Ohm meter. All it takes is one imperfect connection and the teleconverter is going to interfere with the camera to lens chip communication.

I use the D7100 with the 1.4, 1.7, and 2x teleconverters with a 70-200mm f2.8, 80-400mm f5.6, and 500mm f4 lens. It works exceptionally well with respect to autofocus with all three teleconverters.

With the 2x teleconverter the 500mm f4 becomes a 500mm f8 lens and I need to be sure to use the single row of f8 AF sensors with the D7100 (or the D800 for that matter).

Visit my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

            
brada Silver Member Nikonian since 29th Jan 2008Wed 23-Apr-14 01:24 AM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#14. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 12


US
          

finally heard from Nikon and they want me to send in all 3 items… bummer.

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                
Lunastar Silver Member Nikonian since 06th Jan 2010Tue 29-Apr-14 12:50 PM
3073 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#17. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 14


Mankato, US
          

It could be just the TC. Years ago I had a 300/2.8 that I used with both a 17TC and a 14TC. The 14 worked flawlessly all the time but the 17 would act up and stop focusing from time to time. I'd clean the contacts and it would work for a while then stop. Very frustrating! There was obviously a communication problem between the lens/TC as the 17 TC worked with my other long glass, a 300/4 and a 200-400/4.

When things slow down I'm afraid you're gonna have to send in the entire rig although, I'd bet it's the lens and TC coupling and not the D7100.

Good luck and a smart move to bring a 80-400 on your trip. The 80mm end will come in handy for wide wildlife "scapes."

Mark




www.mercuryoutdoorcommunications.com

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                    
brada Silver Member Nikonian since 29th Jan 2008Tue 29-Apr-14 12:59 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#18. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 17


US
          

You are probably right…
I am still gonna bring the 300 /4 and my 70-200 f/2.8.
The 80-400 is a nice lens but it needs light to work at its optimum.

BTW, thanks for the location at Crex Meadows. Will probably look in that area on Sunday and Monday, depending on weather.

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                        
km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009Sat 03-May-14 05:55 AM
3301 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#19. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 18


St Petersburg, RU
          

A common element between these cases is cleaning. How and with what solvent. Contacts almost never become dirty, I have hardly ever seen intermittent conduction due to dirt in 5 decades of work with electronics. What is very common however is oxidation of metal contacts. That is not dirt but a normal chemical process on metals exposed to atmospheric oxygen.
What chemical did you use to clean?
Almost anything listed as a cleaner will make the problem worse. A de-oxidizer is needed. The most readily available is De-Oxit from Caig Laboratories.
Any type of abrasive such as pencil eraser or abrasive cloth will harm the contacts and shorten their life and make contacts have higher contact resistance.
Stan
St Petersburg Russia

Visit my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

                            
brada Silver Member Nikonian since 29th Jan 2008Fri 09-May-14 02:28 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#21. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 19


US
          

I did clean with Deoxit from Caig Labs.

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

radkrishr Gold Member Nikonian since 29th Nov 2005Tue 06-May-14 09:10 AM
173 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#20. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 0
Tue 06-May-14 09:11 AM by radkrishr

Bangalore, IN
          

I have seen this nasty problem at a local dealer when I wanted to buy the AF-S 300mm f/4 with TC 1.4x for my D600. A brand new AF-S 300mm f/4 with a brand new Nikon TC14E-II on a 5100, 7100 and a D90 bombed while the dealer was demonstrating the lens. On the 5100 and 7100 mounted with the TC14E-II would not autofocus. The D90 locked up its mirror and could not be released. The dealer had to send the units back to Nikon.

I still went ahead and bought a new AF-S 300mm f/4 along with the TC14E-II and TC17E-II and mine worked flawlessly from an autofocus and IQ perspective. First day in to the shooting, the AF-S motor started making a squeaking noise when focused. I got worried and contacted the Nikon Service. They inspected my brand new Nikkor AF-S 300mm f/4 and said the AF-S motor has failed. Luckily its brand new and is under warranty. The lens is still with them for a AF-S replacement.

But the time it was working, the performance and the IQ was awesome. I absolutely love this lens with 1.4x for its performance. I just wish I had a good copy of this lens. You can find it all in this thread here:

http://www.nikonians.org/forums/dcboard.php?az=show_topic&forum=146&topic_id=231293&mesg_id=231293&page=


- Radha
D600 & N80

Visit my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

    
brada Silver Member Nikonian since 29th Jan 2008Fri 09-May-14 02:52 PM
369 posts Share on Facebook Share on Twitter Share on Linkedin    Click to send email to this author Click to send private message to this authorClick to view this author's profile
#22. "RE: 7100, 300 f/4 and 1.4x Focussing Issue"
In response to Reply # 20


US
          

I have been very happy with the performance with this combination. Just this intermittent problem and now permanent focussing problem. Looks like I have to send my entire rig in for a repair.

http://www.bradaphotography.com
my Nikonians gallery.

  

Alert Printer-friendly copy | Reply | Reply with quote | Top

Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D7100, D7000 (Public) topic #33569 Previous topic | Next topic


Take the Nikonians Tour and learn more about being a Nikonian Wiki /FAQ /Help Listen to our MP3 photography radio channels Find anything on Nikon and imaging technology - fast!

Copyright © Nikonians 2000, 2014
All Rights Reserved

Nikonians®, NikoScope® and NikoniansAcademy™ are trademarks owned by Nikonians.org.
Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation.