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07-09-2009, 02:28 AM   #1
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Pentax "A" lens and "F" 1.7X converter on K10d

I am using an "A" lens and a SMC F 1.7X converter. My K-10d controls the apertures well, but it does not recognize the focal length of the "A" lens or the lens attached to my F 1.7X converter.

Is this normal? The K10d seems to need the focal length value to have the lens properly stabilized.

Thanks a lot.

07-09-2009, 03:17 AM   #2
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QuoteOriginally posted by yyyzzz Quote
I am using an "A" lens and a SMC F 1.7X converter. My K-10d controls the apertures well, but it does not recognize the focal length of the "A" lens or the lens attached to my F 1.7X converter.

Is this normal? The K10d seems to need the focal length value to have the lens properly stabilized.

Thanks a lot.
That's normal, you have to dial in the focal length manually, since the camera cannot know it - The old A lenses don't have a micro chip with that information.

Ben
07-09-2009, 03:37 AM   #3
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If your have SR ( shake reduction ) on when you turn on your camera it will automatically pop up on LCD to set focal length. Otherwise you will find in menu. Good luck.
07-09-2009, 03:52 AM   #4
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Thanks Man!

Yes. I do manually put in the focal information. But it is hard for zoom lenses. I might have to put a middle value in it.

It is hard to understand why my F 1.7X converter does not convey the focal information, even if attached lenses are FA or F lenses.

07-09-2009, 05:04 AM   #5
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QuoteOriginally posted by yyyzzz Quote
Yes. I do manually put in the focal information. But it is hard for zoom lenses. I might have to put a middle value in it.

It is hard to understand why my F 1.7X converter does not convey the focal information, even if attached lenses are FA or F lenses.
The 1.7x AF-adapter is very old. At that time, nobody anticipated Shake Reduction or even EXIF data. So there was no need to add any intelligence into the adapter. We cannot expect old equipment to perform like current one - and we should be happy, that we can still use it at all.

Ben
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