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10-17-2010, 11:24 AM   #1
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Sears 135mm F2.8 on K200 not working

hello,
I am new to third part lenses as well as prime lenses. I have a K200 model of Pentax and recently started experimenting with primes. I bought a auto sears 135mm f2.8 with pk mount on ebay. I mount it on my K200 and it doesn't work . When I switch on my camera in manual mode, looks like the camera can not recognize the f number. The F number on my display shows F-- and keeps blinking. Am I missing something ?. How do I get this lens to work?
Appreciate greatly any help.
Thanks

10-17-2010, 11:46 AM   #2
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Sears lens

Look in your manual for "use aperture ring". It should be one of the last items in the custom menu. Once you have activated this feature the lens should work. Keep in mind that you will pretty much be in full manual mode and the metering on the camera may not tell you much so you will have to experiment. I have a KX but I know someone who uses a istDS and he uses an old pentax manual focus-m lens and it works great.
Hope this helps, good luck.
10-17-2010, 12:06 PM   #3
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Thanks rekordboy...It works!. As you mentioned, I permitted use of aperture ring in my custom settings. Did not know about that setting.
Thanks a lot.
10-17-2010, 12:32 PM   #4
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Here's an article on how to meter with the lens- thought it might also be helpful!

https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-manua...7-k-x-etc.html


Adam
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10-18-2010, 12:21 PM   #5
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Hey Adam,
Thanks for the link. I am planning to buy some Super Tak telephoto lenses as well. The link will be of great help. Thank again for putting the article together.
10-18-2010, 12:35 PM   #6
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QuoteOriginally posted by Adam Quote
Here's an article on how to meter with the lens- thought it might also be helpful!

https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-manua...7-k-x-etc.html
Adam, I think this needs editing:

"Pictured below is the genuine Pentax adapter."
10-18-2010, 12:40 PM   #7
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QuoteOriginally posted by photovats Quote
Thanks rekordboy...It works!. As you mentioned, I permitted use of aperture ring in my custom settings. Did not know about that setting.
Thanks a lot.
You'll still get the F-- because the lens can't communicate the aperture to the body, but at least it ain't blinking any more!

And be aware that many older manual focus Pentax and third model lenses WILL communicate the F stop data. It just depends on the series of the lens.

I basically use all old, manual stuff (see my signature), and aside for my K-x's kit lens, it's F-- all the way for me.
10-18-2010, 05:54 PM   #8
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QuoteOriginally posted by Ira Quote
You'll still get the F-- because the lens can't communicate the aperture to the body, but at least it ain't blinking any more!

And be aware that many older manual focus Pentax and third model lenses WILL communicate the F stop data. It just depends on the series of the lens.

I basically use all old, manual stuff (see my signature), and aside for my K-x's kit lens, it's F-- all the way for me.
yes I realized that. After I changed the setting, the blinking stopped and yes F-- still shows, but I can take pics now. As you said it can't communicate aperture setting to the body. Thanks for the input.

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