K100D-Super Manual lens compatibility

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sam-joseph

Link Posted 06/01/2010 - 00:46
Hello all,
I've just bought a Takumar 135mm f2.5, and can't seem to get it to work in M mode on the K100D Super. It looks like I'm restricted to using it wide open in Av mode. Is it possible to set the aperture on this lens/camera combination? Incidentally, I've done a quick comparison between this lens, a Sigma 70-300APO and a Tokina 80-400 AT-X. All lenses were at 135mm and wide open. (f4 for the Sigma and f4.5 for the Tokina). The subject was garden plants and white bird-bath on a bright sunny day. The Takumar and Tokina had the richest colours, but the Sigma showed the best control of fringing around the bird-bath. The Tak only just lags behind the Tokina in this case. Not bad for a $100AUD lens. But I digress...
Sam-Joseph
Pentax K7, Sigma 17-70 f2.8-4.5, Sigma 70-200 f2.8 APO EX, Sigma 70-300 APO, Sigma 1.4x TC, Vivitar 2x TC. Takumar 135mm f2.5, SMC Pentax A 50mm 1:1.7, SMC Pentax -M 1:4 200mm, Pentax X70

bforbes

Link Posted 06/01/2010 - 01:09
I believe if the lens does not have the "A" setting on the aperture ring you have to enable the use of the aperture ring in the camera Menu. I don't know about the K100 but on the K20 it's under Custom Settings
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

sam-joseph

Link Posted 06/01/2010 - 01:39
bforbes wrote:
I believe if the lens does not have the "A" setting on the aperture ring you have to enable the use of the aperture ring in the camera Menu. I don't know about the K100 but on the K20 it's under Custom Settings

I've done that already. I was wondering if the K20D mount is exactly the same as the k100D Super, eg crippled Kaf2?
Regards
Sam-Joseph
Pentax K7, Sigma 17-70 f2.8-4.5, Sigma 70-200 f2.8 APO EX, Sigma 70-300 APO, Sigma 1.4x TC, Vivitar 2x TC. Takumar 135mm f2.5, SMC Pentax A 50mm 1:1.7, SMC Pentax -M 1:4 200mm, Pentax X70

sam-joseph

Link Posted 06/01/2010 - 06:35
Hello all,
It's wonderful what you can find out on the internet. Turns out, I wasn't using the AE-L button correctly. I've now learnt how to "stop down"as the pros say, and whats more, that purple fringing has miraculously disappeared from the bird-bath at apertures of f4 and above.
Stand down chaps,
Regards
Sam-Joseph
Pentax K7, Sigma 17-70 f2.8-4.5, Sigma 70-200 f2.8 APO EX, Sigma 70-300 APO, Sigma 1.4x TC, Vivitar 2x TC. Takumar 135mm f2.5, SMC Pentax A 50mm 1:1.7, SMC Pentax -M 1:4 200mm, Pentax X70

bforbes

Link Posted 06/01/2010 - 10:06
Is not the internet a wonderful thing
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

zealousdp

Link Posted 23/03/2010 - 21:39
OMG, thank you for this post. I just bought a "new" lens and was wondering how to stop down in ANY mode - I thought I was going mad when I adjusted the aperture ring and the DOF was EXACTLY the same at every stop. Now working with M instead of Av for this third party lens.

Thanks again. Will definately try to get lenses that work stopped down in Av mode - any suggestions?

(I going to start a thread on this in a minute)

Anvh

Link Posted 23/03/2010 - 22:04
RTFM Page 188

Here is the digital manual http://www.pentaximaging.com/images/temp/63391640861465894351294K100D_Super_e_we...

go to page 190 to get page 188 of the manual.
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Last Edited by Anvh on 23/03/2010 - 22:05
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