Nikon Rumors Forum » Topic: lens problem, machine problem or the problem will be mine?

vicente on "lens problem, machine problem or the problem will be mine?"

vicente — Sun, 18 Apr 2010 08:22:19 +0000

hello again ..
someone can indicate me some tests more reliable to make the lens to see this part of the focus and sharpness?
what is the best test I can do?
Thank you all again.

vicente on "lens problem, machine problem or the problem will be mine?"

vicente — Sat, 17 Apr 2010 16:11:17 +0000

PB PM said:
Okay, you didn't exactlly explain the pictures the first time, but it all makes sense now. Seems fine.

sorry,my fault.

I can say that I was relieved to be okay, if not completely discouraged and that ..

PB PM on "lens problem, machine problem or the problem will be mine?"

PB PM — Sat, 17 Apr 2010 16:09:28 +0000

Okay, you didn't exactlly explain the pictures the first time, but it all makes sense now. Seems fine.

vicente on "lens problem, machine problem or the problem will be mine?"

vicente — Sat, 17 Apr 2010 16:06:09 +0000

PB PM said:
Ah looks like a back focus problem. The only way to fix back focus is to take your camera and lenses in to have the AF sensitivity adjusted.

I did the test back focus, as you can see here:
I focused on in this box:
http://img117.imageshack.us/img117/6374/pi2.jpg

I focused on this stack:
http://img709.imageshack.us/img709/699/pi1k.jpg

probably this test does not guarantee anything ..but, shooting at close looks, it`s seems okay.

PB PM on "lens problem, machine problem or the problem will be mine?"

PB PM — Sat, 17 Apr 2010 15:57:19 +0000

Ah looks like a back focus problem. The only way to fix back focus is to take your camera and lenses in to have the AF sensitivity adjusted.

vicente on "lens problem, machine problem or the problem will be mine?"

vicente — Sat, 17 Apr 2010 15:48:04 +0000

PB PM said:
Are you shooting with the 50mm F1.4 wide open? If so that would explain the apparent softness.

yes.

vicente on "lens problem, machine problem or the problem will be mine?"

vicente — Sat, 17 Apr 2010 15:46:42 +0000

I have a few pictures to show:
focus on the dog's head, and look better if the ground in front of the dog and that it focused.
http://img52.imageshack.us/img52/3255/dsc01461bk.jpg

some test.
http://img62.imageshack.us/img62/9873/dsc0003c.jpg

http://img117.imageshack.us/img117/6374/pi2.jpg

http://img709.imageshack.us/img709/699/pi1k.jpg

PB PM on "lens problem, machine problem or the problem will be mine?"

PB PM — Sat, 17 Apr 2010 15:23:15 +0000

Are you shooting with the 50mm F1.4 wide open? If so that would explain the apparent softness.

mb on "lens problem, machine problem or the problem will be mine?"

mb — Sat, 17 Apr 2010 15:05:20 +0000

The problem is yours anyway.
If you have focus problems it is more likely your lens then the camera (machine).
If you can try different lens and see what happens.
I would give the lens and the camera to service for check.

vicente on "lens problem, machine problem or the problem will be mine?"

vicente — Sat, 17 Apr 2010 14:52:03 +0000

Hello everyone, I would say that this is my first post here, on the forum.
I have a problem and is very demotivating to me.
I have the following equipment: Nikon D90 + AF-S NIKKOR 50mm 1:1.4 G f
((Recently i made an upgraded from D80 to D90, and to be honest was getting better results in D80 ..)
I have noticed that the focus of the machine is not in the right place.
that is, if i focus in two or three meters of the object the focus is not in the right place, but if i focus in top of the object that's okay.
i also made a test focusing lens and everything seems in order ...
has anyone had problems with this lens?

Another problem is sharpness, I do not manage to get the sharpness I want, now i dont know if the sharpness out of this machine is ok, or I'm demanding.
has anyone had problems with this lens?
and where do I find out what the best settings for my machine (D90)

a thanks to all.