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Subject: "Hard to focus correctly at f1.8 ~~" Previous topic | Next topic
MINGZNIKONIAN Registered since 28th Oct 2005Sat 03-Dec-05 12:27 AM
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"Hard to focus correctly at f1.8 ~~"


Regina, CA
          

I use my 50mm f1.8 lens a lot, but find when set to f1.8, the D50 has major difficulties focusing correctly~~

Anyone else experience this problem? is it the Multi-CAM900 at fault or is it the low DOF character at f1.8?


MINGZCAN

http://www.pbase.com/mingzcan

  

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Replies to this topic
Subject Author Message Date ID
Reply message RE: Hard to focus correctly at f1.8 ~~
avm247 Moderator
03rd Dec 2005
1
Reply message RE: Hard to focus correctly at f1.8 ~~
MINGZNIKONIAN
03rd Dec 2005
2
     Reply message RE: Hard to focus correctly at f1.8 ~~
jayswift
03rd Dec 2005
3
          Reply message RE: Hard to focus correctly at f1.8 ~~
edmun
03rd Dec 2005
4
               Reply message RE: Hard to focus correctly at f1.8 ~~
Shred
03rd Dec 2005
5
                    Reply message RE: Hard to focus correctly at f1.8 ~~
MINGZNIKONIAN
03rd Dec 2005
6
                         Reply message RE: Hard to focus correctly at f1.8 ~~
soupdragon
09th Dec 2005
7

avm247 Moderator Awarded for high skills in documentary architecture and aviation photography Charter MemberSat 03-Dec-05 01:36 AM
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#1. "RE: Hard to focus correctly at f1.8 ~~"
In response to Reply # 0


Rancho Cordova, US
          

What sensor are you using? What is the subject? What is the ambient lighting like? Are you sure the focus shift is not due to 1) your body movement, 2) camera movement, or 3) subject movement? Are you sure it is not due to shallow DOF?

Can you post an example?

Anthony

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MINGZNIKONIAN Registered since 28th Oct 2005Sat 03-Dec-05 01:50 AM
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#2. "RE: Hard to focus correctly at f1.8 ~~"
In response to Reply # 1


Regina, CA
          

say i was taking picture of a hand, it seems to calculate the closing distant incorrectly and focus to the background... so the background is sharp, but the hand is all blurry... maybe is the lack of ambient light... I just wonder will the D70s do better?

MINGZCAN

http://www.pbase.com/mingzcan

  

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jayswift Registered since 02nd Dec 2005Sat 03-Dec-05 04:41 AM
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#3. "RE: Hard to focus correctly at f1.8 ~~"
In response to Reply # 2


yonkers, US
          

jayswiftit sounds like a apature problem try changing to a dif ap
setting

jayswift

  

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edmun Registered since 16th Sep 2003Sat 03-Dec-05 04:47 AM
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#4. "RE: Hard to focus correctly at f1.8 ~~"
In response to Reply # 3


eugene, US
          

No the D70's will not do better. The D200, D2x but I do not think they will help.

I think you can solve the problem in 3 ways.

1: uses closest focus setting,
2: use focus lock after focusing on hand and re compose
3: select the focus spot that is on the hand as your prime spot.

and yes you have zero depth of field at f1.8

ledmun

  

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Shred Registered since 28th Oct 2005Sat 03-Dec-05 12:19 PM
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#5. "RE: Hard to focus correctly at f1.8 ~~"
In response to Reply # 4


FI
          

You can check if there is front/back focus issues with this focus chart.
Results are not 100% reliable but it should give some clue.

  

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MINGZNIKONIAN Registered since 28th Oct 2005Sat 03-Dec-05 04:59 PM
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#6. "RE: Hard to focus correctly at f1.8 ~~"
In response to Reply # 5


Regina, CA
          

Thx for everyone advice!

MINGZCAN

http://www.pbase.com/mingzcan

  

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soupdragon Basic MemberFri 09-Dec-05 08:10 PM
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#7. "RE: Hard to focus correctly at f1.8 ~~"
In response to Reply # 6



          

If your subject is not moving very much you could always try manual focus.

  

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Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D60/D50/D40 (Public) topic #828 Previous topic | Next topic


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