a longtime d7000 & d5100 user's thoughts

Started Jan 12, 2013 | Discussions thread
Mako2011
MOD Mako2011 Forum Pro • Posts: 24,580
Better decription.

ocean76 wrote:

Mako2011 wrote:

ocean76 wrote:

JakeB wrote:


and I assure you that I really really want to love my d7k and get sharper results and want to trust it 100%..
but whenever I make a quality test there's sth wrong with the quality..(I havent done too many though)

And the tests do seem tp point to a lens issue...not a body issue.

I dont understand, sorry... If the problem is with my lens then how do i get sharper results with the very same lens when it is on my d5100...

A lens can work great on on body and not on another.....that is normal and doesn't mean your body is off.

From Lensrental article

"Most people assume that ‘fine’ means ‘perfectly calibrated’. In reality cameras are like any other manufactured item, calibration is within a given tolerance range.... say the manufacturer will consider a camera or lens to be ‘in specifications’ if its + or – 3 ‘focus units’ from perfect. We can assume they reached this number because anything within + or – 3 focus units will be within the depth of field of a wide aperture (probably f/2.8) lens.

Lets consider that I have a camera body that is -2 focus units from perfect, and a lens that is +2 focus units from perfect. Both are considered ‘fine’ according to the manufacturers definition, although they certainly aren’t perfect. However, the combination of a +2 lens on my -2 camera will be absolutely perfect, I’ll love the lens on my camera.

But what if the lens was -2 focus units from the theoretical perfect and I put it on my -2 focus units from perfect camera? Well it depends. If the lens is say an f/4 maximum aperture, probably not much: the depth of field from an f/4 aperture lens may well mask a bit of front focusing or back focusing. You might notice the lens frontocuses 3 feet in front of the subject at 20 feet if you pixel peep, but since the depth of field is 10 feet the subject is still in focus and the lens seems fine.

But if its an f/1.4 lens with a very shallow depth of field, the front focusing will be noticeable: the subject will be out of focus and soft. If I know how to do a front/backfocus test I may have figured out the problem, but here’s the kicker: if I sent the lens in to the manufacturer to fix the problem they would check the lens out, say it was fine (because it is fine, its within specifications) and send it back. Ony if I send the camera and lens together to be calibrated would the fact that the two together are out of focus be apparent, and then the manufacturer would be able to fix the calibration.

... If the camera calibration was adjusted as part of the fix, I might find that another lens in my kit that used to be great, now backfocuses a bit. In the past, many full time pros who were aware of these issues, would send their entire collection of cameras and lenses to the manufacturer to be calibrated together. This was one of the original reasons Canon and Nikon formed their Professional Services groups. Most of the rest of us just made do, or sent copy after copy of a given lens back until we got one that was sharp ON OUR CAMERA."

AF Fine tune would/may have solved your issue.

Also, i have 4 different lenses and according to this reikans focal software test, all of my lenses require fine tuning, all the 4 lenses.. Isnt it weird?

No, that is normal. If they had all required -15 or higher...then I would have sent both camera and lens to Nikon so that camera could be calibrated.

More info

Why we should all AF fine-tune our lenses

How to use the AF Fine-Tune function

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My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)

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