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02-10-2013, 07:19 PM   #1
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K-30 and old 35 mm lenses

Hi all. Wanting to get into the dslr thing and have decided to get a k-30. I had a pentax sf-1 back in the day and I still have like an 18-55 and a telephoto lens , both were from sigma and both were pretty nice. What are the odds they'll work, and work well? thanks in advance...

02-10-2013, 07:29 PM   #2
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All K-Mount lenses work in the K-30. The SF-1 used autofocus lenses that ought to work on the K-30. You can look them up in the lens database here for more info.
Sigma Lenses - Pentax Lens Review Database
02-10-2013, 07:32 PM   #3
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Backwards compatibility is a big marketing feature that seems to have failed in this case :-)
02-10-2013, 07:47 PM   #4
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I pulled them out... one is a 75-200 sigma af zoom, made in japan has a number 2021283, cannot find a model number though. the other is a sigma, made in japan, 35-70. the camera no longer works but the lenses look to be in excellent shape. do they need, or would they benefit from, some type of lube??

02-11-2013, 11:34 AM   #5
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Be aware that every time you change the focal length on your lens that you will have to input the data into the camera. Even if yours is an auto in terms of exposure you will still have to change focal length data every time you zoom the lense. I have an old Sigma 75-300 and it works fine expect for the stopping to correct the focal length data every time I zoom the lens. I plan on replacing it soon. If I sound repetitious it is because inputing the new focal length every time you change it begins to feel like that. But get the K30 anyway it's a great camera. I love mine.
02-11-2013, 01:06 PM   #6
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QuoteOriginally posted by Steven Chain Quote
Be aware that every time you change the focal length on your lens that you will have to input the data into the camera. Even if yours is an auto in terms of exposure you will still have to change focal length data every time you zoom the lense. I have an old Sigma 75-300 and it works fine expect for the stopping to correct the focal length data every time I zoom the lens. I plan on replacing it soon. If I sound repetitious it is because inputing the new focal length every time you change it begins to feel like that. But get the K30 anyway it's a great camera. I love mine.
If not using the shake reduction then you do not necessarily have to enter the focal length each time you zoom.

The focal length information is mainly used only for two things, that is to properly adjust the shake reduction and secondly to record the information in the exif data.

It is also used to some extent when you are in the auto and program modes, as it influences to some extent the choice of aperture/f/ISO but in general you wouldn't be using such modes with older lenses anyway.
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