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12-20-2010, 09:35 PM   #1
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Noob Question IS on manual focus A Zoom lenses

IE: If I use 70-200mm A lens in low light does Image Stabilization still work through all focal lengths with slow shutter speed. Any and all help greatly
appreciated.

12-20-2010, 09:53 PM   #2
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As far as my understanding goes... yes, it does.

Does that answer your question?
12-20-2010, 10:01 PM   #3
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SR still works; there have been some discussions as to which focal length you must set when the camera prompts you.
12-20-2010, 10:12 PM   #4
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Thankyou for replys. However if I turn on IS and Turn cam on it does not ask for FL conformation. So therefor can I assume that IS is fully aware of lens and will compensate for all focal lenghts?

12-21-2010, 12:41 AM   #5
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It's simple to check if you have the lens. Just check the EXIF data of some photos taken with the lens; the should indicate the FL used.

According to the K10D manual (page 208), the K10D can not acquire the focal length of an A lens and therefore should ask you for the FL.
12-21-2010, 07:43 AM   #6
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The camera should ask for the FL information.
What lens exactly are you using?
12-21-2010, 03:42 PM   #7
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Are you talking about an IS lens, or are you asking about the SR IN the camera? The camera will only prompt you for the focal length if the SR is turned on. If the lens has IS, the SR on the camera should be turned off, in which case the camera would not ask for the FL.
12-22-2010, 05:37 PM   #8
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I Have been toying with vivitar 70-210 4.5-5.7 A lens. I like shoots taken from 70-120mm stopped down 2 stops 200mm is woefull and wide open suxs. However this lens does not give me a choice with SR so do I assume that SR is aware of this lens IE: all focal lenghts in low light.
K(s)evin
The lens is not an IS lens.
Thankyou for responses

12-22-2010, 06:36 PM   #9
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The camera will not ask if you don't have SR (IS) turned on when you power up the camera with a manual lens. There is No way for the camera to know what Focal length your Vivitar is. When using a lens of this sort, I usually set the focal length somewhere in the middle of the range. You can change it (if SR is active) in the Record menu of any camera I've ever used.

12-23-2010, 09:04 PM   #10
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With Pentax, shake reduction or image stabilization in done inside the camera body, and separate from any lens. Any lens you place on a DSLR with SR (Most of them from the K10D/K100D era and forward) will be able to take advantage of it. There is a switch or menu setting that turns it off and on.

With newer lenses the body can "see" the focal length and adjust, but with older glass (M or A glass for sure, your vivitar for sure) you need to tell the body what focal length you are shooting at.
12-28-2010, 11:24 AM   #11
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IS will help but It has its limits. So brace yourself or use a tripod to be sure once the exposure time exceeds the inverse of the focal length , i.e. if at 200 mm and the time is longer than 1/200s, (1/150s e. g.).
12-29-2010, 03:50 PM   #12
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To clarify... Sorry...

QuoteOriginally posted by sterretje Quote
SR still works; there have been some discussions as to which focal length you must set when the camera prompts you.
If using a zoom lens the camera does not recognise... Say 100-300mm...
Should you enter a focal length of 200mm when prompted? (middle of the lenses range)
Or...
Enter the focal length at which you'll be shooting? (ie; 135mm etc.)

If it's the latter... It kinda make the flexibility of the chosen zoom... Obsolete... Doesn't it? (ie... might as well have used a prime)

Last edited by DaveHolmes; 12-29-2010 at 03:52 PM. Reason: missed a bit.
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