[gwoodward]

Hi. If you use a DA* 16-50 lens (APSC) on a K1 camera, do you get the whole image or vignetting? If so is the problem across all focus lengths (mm etc)? Thanks.

[krazny]

DA* 16-50/2.8 usable at 24mm on the K-1? - PentaxForums.com

[gwoodward]

Krazny: Thanks. I spent ages searching but didn't find this. It won't work at any scale! Regards GW

[TwoUptons]

I’ve found it works better with the hood off... but it still vignettes like mad at most focal lengths...

I’ve also noticed that outside of the APS-C image circle it gets worse fast.

But it’s more usable for square format shots.

-Eric

[david94903]

You might find this resource helpful.

Pentax K-1 and SMC Pentax-DA* 16-50mm F2.8 ED AL [IF] - Compatibility | PentaxForums.com

And also this one.

http://k-1-lab.com/en/smc-pentax-da-s-16-50mm-f28ed-al-if-sdm

[bikehead90]

I’ve found you can TECHNICALLY use it On the K-1, but like everyone has said you get crazy vignetting. The only time I’ve used my DA* 16-50 Ion my K-1, I’ve switched it to crop mode

[gwoodward]

Thanks everyone. If you switch to crop mode on the K1 you only have access to 15 megapixels - 10 less than my K3-II camera. Having checked other sites it seems that the same problem will occur with all my current lenses - 10-17mm fisheye, 15mm limited, 16-50 DA*, HD 55-300 telephoto etc. The only real solution is to buy some FA lenses! With the camera costing £1700 (£900 secondhand) and an HD FA 24-70mm lens costing £1033, that might not be soon! Thanks again.

[UncleVanya]

Thanks everyone. If you switch to crop mode on the K1 you only have access to 15 megapixels - 10 less than my K3-II camera. Having checked other sites it seems that the same problem will occur with all my current lenses - 10-17mm fisheye, 15mm limited, 16-50 DA*, HD 55-300 telephoto etc. The only real solution is to buy some FA lenses! With the camera costing £1700 (£900 secondhand) and an HD FA 24-70mm lens costing £1033, that might not be soon! Thanks again.

The primes are less restrictive. Da 35 (not macro), 40, 50, 55, 70, 200 & 300 all give good coverage (not perfect) on FF.

[pschlute]

If you switch to crop mode on the K1 you only have access to 15 megapixels

If you were to use the 16-50 in FF mode and then crop the picture to remove the vignetting, say to an aps-c sized picture you will also only be getting 15MP. They are both two sides of the same coin.

The answer is to use FF lenses. I agree they are not cheap. You do of course have access to many Pentax legacy lenses, some manual focus and exposure but F and FA lenses are fully automatic. I like the FA 50mm 1.4 lens on the K1. You can pick these up new still or best bet is grab a second hand one for a couple of hundred pounds.. Great IQ and very fast.

[gwoodward]

Thanks Pschlute. I've decided not to bother trying with my old lenses and save up for a K1 and an FA 24-70 lens, almost the same range as my APS-C 18-50 DA* lens. On current prices I need around £900 for the 2nd-hand camera and about £500 for a 2nd-hand lens. Watch this space in about 6 months time. Regards and thanks to all.

[pschlute]

Using all my old film lenses on the K1 at the FOV they were made for is half the fun of owning a K1

[Sakura]

Using all my old film lenses on the K1 at the FOV they were made for is half the fun of owning a K1

Vivitar 80-210 series 1 has always been my favorite lens for my Pentax MX. And finally i can use it again with my K1 with a viewfinder that reminds me at my MX.