nikonians

Even though we ARE Nikon lovers,we are NOT affiliated with Nikon Corp. in any way.


Sign up Login
Home Forums Articles Galleries News Workshops Shop Recommended
members
All members Wiki Contests Vouchers Apps Newsletter THE NIKONIAN™ Magazines Podcasts Fundraising

sharpness: my perpetural struggle

HBB

Phoenix, US
8578 posts

Click to send email to this author Click to send private message to this author

"RE: There's no need for this..."

HBB Moderator Hal is an expert in several areas, including CLS Awarded for his excellent article contributions to the Resources. Charter Member
Wed 30-Jan-13 12:05 AM | edited Wed 30-Jan-13 12:08 AM by HBB

Bob:

I suspect that those suggesting you shoot something (a 12 inch ruler for example) at a 45 degree angle mean the following:

1) Place camera/lens configuration on tripod as above.

2) Place 12 inch ruler, or yard stick, at a 45 degree angle relative to the sensor plane of the camera, and parallel with the lens axis, at a subject to lens distance that fills the image with the ruler/yardstick.

3) Open the lens up to maximum aperture.

4) Focus on the midpoint of the ruler (6 inches) or yardstick (18 inches) and capture an image.

5) Look at the image at "actual pixels" on screen and see if the sharpest part of the image is at the 6 inch or 18 inch point. If the midpoint of the ruler/yardstick is the sharpest point of the image, this probably rules out a focus issue. If the sharpest point of the image is ahead of the midpoint, you may have a near focus issue: the lens is actually focusing closer than indicated in the view finder. If the sharpest point of the image is behind the midpoint, you may have a far focus issue: the lens is actually focusing beyond the point indicated in the view finder. Either of these may possibly be be fixed by a fine focus adjustment in the camera, unless there is a problem with the lens that is beyond the range of fine focus adjustments.

Hope this helps explain things a bit.

Neil is our resident guru in these matters ... you are in good hands.

Regards,

HBB in Phoenix, Arizona
Nikonian Team Member

Photography is a journey with no conceivable destination.

This is a hot, active topic! sharpness: my perpetural struggle [View all] , bobpilot Silver Member, Tue 29-Jan-13 07:19 PM
Subject
ID
Reply message RE: sharpness: my perpetural struggle
1
Reply message RE: sharpness: my perpetural struggle
3
Reply message RE: sharpness: my perpetural struggle
2
Reply message RE: sharpness: my perpetural struggle
4
     Reply message I don't think it's your tripod Bob....
5
     Reply message RE: I don't think it's your tripod Bob....
6
          Reply message Shoot a ruler at 45 degrees Bob...
7
     Reply message RE: sharpness: my perpetural struggle
8
     Reply message There's no need for this...
9
     Reply message RE: There's no need for this...
10
     Reply message Post them here Bob...
11
          Reply message RE: Post them here Bob...
13
               Reply message Sorry, shoot wide open Bob...
15
     Reply message RE: There's no need for this...
14
          Reply message RE: There's no need for this...
16
               Reply message RE: There's no need for this...
19
     Reply message RE: sharpness: my perpetural struggle
12
          Reply message f/4 2000 ISO; 1/800
18
               Reply message Focus looks pretty good to me Bob...
21
                    Reply message RE: Focus looks pretty good to me Bob...
22
     Reply message RE: sharpness: my perpetural struggle
23
Reply message RE: sharpness: my perpetural struggle
17
Reply message RE: sharpness: my perpetural struggle
20
     Reply message RE: sharpness: my perpetural struggle
24
     Reply message RE: sharpness: my perpetural struggle
25
          Reply message RE: sharpness: my perpetural struggle
26
          Reply message RE: sharpness: my perpetural struggle
27
               Reply message RE: sharpness: my perpetural struggle
28
                    Reply message RE: sharpness: my perpetural struggle
29
     Reply message RE: sharpness: my perpetural struggle
31
          Reply message RE: sharpness: my perpetural struggle
32
               Reply message RE: sharpness: my perpetural struggle
33
               Reply message RE: sharpness: my perpetural struggle
35
               Reply message RE: sharpness: my perpetural struggle
34
                    Reply message RE: sharpness: my perpetural struggle
36
                    Reply message RE: sharpness: my perpetural struggle
37
Reply message RE: sharpness: my perpetural struggle
30
Reply message Bob, did you re-shoot that bolt?
38
Reply message RE: Bob, did you re-shoot that bolt?
39
     Reply message RE: Bob, did you re-shoot that bolt?
40
          Reply message RE: Bob, did you re-shoot that bolt?
41
          Reply message RE: Bob, did you re-shoot that bolt?
42
Reply message RE: sharpness: my perpetural struggle
43
Reply message RE: sharpness: my perpetural struggle
44
     Reply message RE: sharpness: my perpetural struggle
45