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03-27-2009, 02:57 AM   #1
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My K200D is asking me a question?

I bought the SMC Pentax M 50mm F1.7 yesterday. Haven't yet fully experimented with it.

Now for using it I set the aperture ring setting to "Permitted". Now when ever the M 50mm is on the body and I turn the camera on, it asks me the focal length of the lens.

Why does it need the focal length?

I know the k200D has a smaller sensor so 50mm of the lens is not a 50mm for the sensor. So, what is the crop factor for the K200D?

03-27-2009, 03:00 AM   #2
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The camera need the focal length for the SR (Shake Reduction),
nothing to do with the crop factor, (crop factor for the k200 it's 1.5)
03-27-2009, 04:58 AM   #3
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QuoteOriginally posted by atyab Quote
I bought the SMC Pentax M 50mm F1.7 yesterday. Haven't yet fully experimented with it.

Now for using it I set the aperture ring setting to "Permitted". Now when ever the M 50mm is on the body and I turn the camera on, it asks me the focal length of the lens.

Why does it need the focal length?

I know the k200D has a smaller sensor so 50mm of the lens is not a 50mm for the sensor. So, what is the crop factor for the K200D?
Like the previous member said it is asking this to set the SR. Older lenses lack the ability to communicate this information to the camera. Newer lenses have this ability, that's why it never asks the question when using a DA lens.

Crop factor is still 1.5X, but when it asks that question you should input the length of the lens; i.e. 50mm.

Simple answer - a 50 mm lens is always a 50mm lens; regardless of crop factor.
03-27-2009, 06:12 AM   #4
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Thank you guys!

03-27-2009, 10:47 AM   #5
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Indeed...those guys are right! Enjoy the M50 (you can see I do)
03-27-2009, 01:39 PM   #6
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Thanks ryan_s. I had been looking forward to buying a 50mm for some time now. So hopefully I will enjoy it.
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