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Forum: Repairs and Warranty Service 06-12-2019, 11:39 AM  
Pentax FA* 300mm f2.8 Back focus issues
Posted By Mikkel128
Replies: 6
Views: 486
I have tested both with and without a filter in the rear holder. To me it made no difference in the autofocus.

Can anybody recommend a service facility in Europe that will be able to calibrate the lens?
Forum: Repairs and Warranty Service 06-12-2019, 01:27 AM  
Pentax FA* 300mm f2.8 Back focus issues
Posted By Mikkel128
Replies: 6
Views: 486
Hi Forum,

I have recently purchased a Pentax FA* 300mm f2.8 secondhand from a dealer in Germany. It is a lovely lens and I am very fond of it. However the lens have severe back focusing issues when using auto focus.

I have tried to correct this using the in camera autofocus correction on my Pentax K3 body. The adjustment range on this camera is not sufficient to fix the issue.

Using debug mode I have adjusted the camera autofocus and this combined with a autofocus correction of +8 has resolved the issue. Unfortunately the corrections made in debug mode now cause my other lenses to have front focus issues.

I have contacted my local Pentax service center (I live in Denmark so my closest center is in Sweden) and asked if they could calibrate the lens. I received the following reply, " Sorry your lens is to old so it canīt be adjusted."

Now my question is this:
Is it true that this lens cannot be adjusted for back focusing issues?
What would you guys do? I have a 30 days full refund return option on the lens. However I like the lens, and it is not likely that I will come across another one anytime soon.
Are there any other options I should consider?
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