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07-08-2018, 10:19 AM   #1
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K-1 and DA lens compatibility

I recently mounted all of my DA lenses and tested them on the K-1. I only have three: The Pentax-DA 1:2.8 35mm Macro Limited; The Pentax DA 1:1.8 50mm; and the SMC Pentax-DA 1:3.5-135. I was surprised to find the 50 mm lens was the only one that had no vignetting at any aperture. Has anyone found other DA lenses that are fully compatible with FF bodies?

07-08-2018, 10:28 AM   #2
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Others have. I don't own the K-1 or K-1II

Here's a couple links

Pentax K-1 Lens Compatibility Guide - Articles and Tips | PentaxForums.com

DA lenses on Full Frame: Test Shots thread - PentaxForums.com

Enjoy!
07-08-2018, 07:12 PM   #4
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QuoteOriginally posted by Texas-expat Quote
I recently mounted all of my DA lenses and tested them on the K-1. I only have three: The Pentax-DA 1:2.8 35mm Macro Limited; The Pentax DA 1:1.8 50mm; and the SMC Pentax-DA 1:3.5-135. I was surprised to find the 50 mm lens was the only one that had no vignetting at any aperture. Has anyone found other DA lenses that are fully compatible with FF bodies?
I read a comment today that I hadn't thought about. Apart from some excess vignetting and loss of peripheral quality all the DA primes that are > 35mm cover the FF image circle. The DA 35 f/2.4 would also fit that bill. The quality level and acceptability are debatable and there are no official correction profiles for the vast majority of them.

07-09-2018, 12:51 AM   #5
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For some reason people tend to forget about this official source where you can see images taken with the K-1 and almost every DA, DA* and DA limited lenses amongst others...

PENTAX K-1 Laboratory | PENTAX K-1 Special site | RICOH IMAGING

There you can judge yourself as @UncleVanya very well put it.
07-09-2018, 01:06 AM   #6
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QuoteOriginally posted by Texas-expat Quote
Has anyone found other DA lenses that are fully compatible with FF bodies?
*Fully* compatible? DA*200, DA*300, DA560. That's coming from Ricoh.

As for the rest, off the top of my head:

The DA35/2.4, DA50 and DA*55 are as near as dammit, and the DA40 and DA70 aren't far behind. The DA*60-250 works quite well if you modify the rear baffle, thus voiding your warranty.

The DA35 macro is OK (not great) at close focus only. The DA10-17 covers the full frame from 14-15mm, but (like the 35 macro) not without IQ loss at the edges. The DA12-24 is apparently also quite usable after about 14mm. The DA*50-135 is OK with the teleconverter, while the TC makes many other lenses worse. The 55-300 variants only work well around the 200mm mark.

I'm sure I've missed some, but that'll do for now
10-10-2019, 12:44 PM   #7
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QuoteOriginally posted by Texas-expat Quote
Has anyone found other DA lenses that are fully compatible with FF bodies?
Which ideas did you get from this thread?
By the way, here's an timeline of Pentax AF lenses in which fullframe lenses can be identificated by color:
Template:Pentax K-mount AF lenses timeline - Wikipedia
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