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02-22-2007, 08:57 PM   #1
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? to enter for A Series lenses on the K10D

When you use an A or earlier series lens on the K10D you have to enter the focal length on startup.

Do you enter the standard focal length or the effective focal length?

I can't find anything in the manual specifically saying one way or the other.

I also can't find anything that says if this even matters.

Thanks in advance,
joe

02-22-2007, 10:10 PM   #2
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I'm pretty sure it's the standard focal length

It matters because shake reduction is likely to blur your photos if you enter a focal length greater than the actual one. As strange as that may sound, it's true- I've experienced it myself.

I was once out on a shoot with my A* 200mm and A 50mm/1.2, and after taking some tele's with the 200, I snapped on the 50 (my first time using it, and also my first experience with such a fast lens) and started taking sample shots. In anticipation of superb image quality, I browsed through the images and found every since one to be blurred. After much confusion, I decided to try turning SR off, and that did the trick. I later realized that the focal length was still set to 200mm...

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02-22-2007, 10:16 PM   #3
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Where the heck do you enter the focal length?
02-22-2007, 10:31 PM   #4
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On my K100D, it asks for the focal length when I turn it on after mounting a manual lens.

02-22-2007, 10:49 PM   #5
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QuoteOriginally posted by Artyste Quote
Where the heck do you enter the focal length?
QuoteOriginally posted by Tom Brown Quote
On my K100D, it asks for the focal length when I turn it on after mounting a manual lens.
And if you ignore the prompt, you can always change it in the menu. The entry is on the very bottom of the first tab.

Artyste: This only applies to manual lenses

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02-23-2007, 03:15 AM   #6
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You enter the standard focal length. As an added note. If you are using a tele extender enter the total focal length. ie; 200mm lens with a 1.7x TC enter 340mm in the SR prompt.
02-23-2007, 07:08 AM   #7
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"When you use an A or earlier series lens on the K10D"

with an A on the aperture ring it doesnt ask.. it knows.. without the A u have to tell it.. the camer will only ask when its turned on if SR is on.. if not it wont ask..

if the lens is a 200mm lens u tell it 200mm..

at least this is how my k100 does it..

trog
03-01-2007, 09:04 PM   #8
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I just got my Pentax-M SMC 50mm F1.7... so I enter focal length of 50?

03-01-2007, 09:13 PM   #9
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Yup, that sounds right.

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03-01-2007, 09:32 PM   #10
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Yes, you enter the true focal length. Which is interesting on a zoom lens, you might have to re-enter the focal length if you zoom way out or way in.

Too bad the A zooms can't tell the camera what the focal length is. Even the A primes prompt you for the focal length when they're on the A setting. I would have thought they'd tell the camera the focal length, but apparently they don't.
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