Focusing Problem - Help! - DPChallenge Forums

Sony 24-70mm F4 Vario-Tessar T* FE OSS

11/03/2005 10:40:23 PM · #1

Hello,

Check the image. It is of a doll at 1/500 F3.3.

I was on manual focus on Nikon 60mm F2.8 Macro lens on D70.

I focused in on the "right" eye as looking at the photo. However as you can see, it is the left eye that is in focus. I tried on a few other objects and more of the same resulted. It seems that the eyes are too far apart for me to be moving enough to lose focus in one eye and gain in the other.

Has anyone else seen this issue before?

Kenskid

Bear_Music

Samsung Galaxy S24 Ultra

11/03/2005 11:21:08 PM · #2

Several immediate answers to this come to mind:

1. You have not used your dioptric adjustment at the viewscreen to compensate for slightly deficient vision; your eye is focusing slightly in front of the screen.

2. Your camera is slightly out of alignment and the optical distance from lens to viewfinder is slightly different than the distance fromn lens to sensor plane.

3. Your 60mm lens has a back focus problem, although to be honest I'm not sure exactly how this comes into play with manual focusing. I know with autofocus, back focus shows up when the camera thinks it's in focus on point "x" when it's actually focused on point "y" somewhere behind point "x".

You should try doing this with a ruler at a 45-degree angle and figure out precisely what's going on...

R.

11/03/2005 11:31:39 PM · #3

Thanks bear...I'm uploading some ruler shots in about 5 mins.

Originally posted by bear_music:

Olympus 12-45mm f/4.0 Pro

11/03/2005 11:38:08 PM · #4

Here are a couple of 45 degree ruler shots... focused on 6" auto focus and then 6 inch manual.... as you can see it looks like it is dead on. So I guess I may just be a bad focuser.

I also check my vision/dioptric and it is ok.

Comments?

OdysseyF22

Panasonic DC-G9

11/04/2005 12:12:20 AM · #5

I'm still new to all this, so bear with me...

How do you adjust the dioptric so you know its right? I've played with it a bit, but I don't really know what "right" is, so I'm not sure what to look for.

Bear_Music

Samsung Galaxy S24 Ultra

Sony 24-70mm F4 Vario-Tessar T* FE OSS

11/04/2005 12:12:58 AM · #6

Doesn't look like you have a problem, technically. Prolly just missed your focus on the others?

R.

Bear_Music

Samsung Galaxy S24 Ultra

Sony 24-70mm F4 Vario-Tessar T* FE OSS

11/04/2005 12:14:15 AM · #7

Originally posted by OdysseyF22:

point your camera at a plain, bright sky or wall, to get a bright viewfinder, and adjust the dioptric wheel until the markings on the viewscreen are in tack-dharp focus.

Robt.

OdysseyF22

Panasonic DC-G9

Olympus 12-45mm f/4.0 Pro

11/04/2005 12:20:01 AM · #8

Originally posted by bear_music:

Originally posted by OdysseyF22:
I'm still new to all this, so bear with me...

How do you adjust the dioptric so you know its right? I've played with it a bit, but I don't really know what "right" is, so I'm not sure what to look for.

point your camera at a plain, bright sky or wall, to get a bright viewfinder, and adjust the dioptric wheel until the markings on the viewscreen are in tack-dharp focus.

Robt.

Okay, so it is as simple as it looked! Thanks bear!

11/04/2005 12:32:42 AM · #9

I adjust it by:

Going to autofocus and focusing on something...if your autofocus cam "beeps" to tell you that you have "focus" and you see it clearly through the eyepiece then your dioptric is set properly..

Originally posted by OdysseyF22: