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09-06-2007, 07:21 PM   #1
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Help with lens settings

OK....I took the plunge and acted on the advice of Pentax that the K10D can use old Pentax lenses. I got the SMC Pentax-M 35-70 zoom 2.8/3.5

First time I have used an old lens. Fits OK, but can't get the shutter work work. Obviously I am doing something wrong, and must have to change the settings....

Can anyone tell me what to do?

09-06-2007, 07:40 PM   #2
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Make sure you're not leaving it in an auto-focus mode. When in AF, the camera will not allow the shutter to release unless there's a positive focus lock. Switch to MF, and you can release the shutter no matter how blurry or sharp your shot is.

When in AF mode, you can move the focusing ring until the camera detects focus (green hexagon in viewfinder). As long as the focus indicator is lit, you can take a shot. Some people do what's called a "focus trap" where the shutter button is held down while manually focusing in AF mode. Since the camera won't shoot until focus is achieved, the shot will be taken automatically the instant the subject is made sharp. It's a cool trick that only works with manual focus lenses.
09-06-2007, 07:42 PM   #3
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You also need to go into custom functions and allow release in "other then A". Otherwise the camera will think that the lens is not mounted properly.
09-06-2007, 07:46 PM   #4
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OK

I have discovered the secret......and the lens works a treat!

09-06-2007, 07:49 PM   #5
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QuoteOriginally posted by davemdsn:
You also need to go into custom functions and allow release in "other then A".
Ahh yes...I forgot the more obvious setting in my response. =)
09-06-2007, 08:02 PM   #6
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QuoteOriginally posted by aerodave Quote
Some people do what's called a "focus trap" where the shutter button is held down while manually focusing in AF mode.
as in full press?
09-06-2007, 08:17 PM   #7
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Thanks to everyone

Your help was greatly appreciated....I went into the "C" menu area. Now I just have to discover if I have to go out of it again when I use the normal DA lenses! This form is sooooooo great in terms of help!
09-06-2007, 09:28 PM   #8
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You shouldn't have to change that setting back when using an auto-aperture lens. The reason aperture ring use is prohibited by default is, as mentioned above, to prevent you from taking pictures with an incorrectly mounted lens. The camera can't tell the difference between a not-quite-mounted FA lens and a properly mounted M lens.

And praxxis, yes, a full press. Even a full press in AF mode won't release the shutter if there's no focus lock. With no lock, the camera just waits for that condition to be met. Once it is...*click*

09-06-2007, 10:57 PM   #9
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thanks for enlightnening me...
09-07-2007, 03:43 AM   #10
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A bit more information

Just a few more pointers to help you using M and K series lenses with your K10D:

Expose in Manual mode: set the aperture on lens then press the green button The camera will set the shutter speed. You can also hold the optical DOF preview lever open and the meter will appear....you can the turn the aperture or shutter speed dial and see the light meter reading change.

Limited Av mode: if you are sure you want to shoot wide open you can use Av mode. But remember the exposure will take place at widest aperture irrespective to what the aperture is set to on the lens.

Note on overexposure: All m and K lenses progressively overexpose on the K10D as you stop down. A fix for this is to replace the focus screen with a DS screen. This solves the problem while leaving correct exposure with the newer A;F;FA;DA lenses unafected.
09-07-2007, 05:38 AM   #11
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QuoteOriginally posted by pschlute Quote
Just a few more pointers to help you using M and K series lenses with your K10D:

Expose in Manual mode: set the aperture on lens then press the green button The camera will set the shutter speed.
Note that in V1.3 of the firmware pentax increased the time the lens is stopped down by almost a factor of 2. this is undocumented in the upgrade

QuoteQuote:
You can also hold the optical DOF preview lever open and the meter will appear....you can the turn the aperture or shutter speed dial and see the light meter reading change.
You can also press the green button while doing this to set exposure, and pentax rep's at one time suggested this was a better way to set manual exposure
QuoteQuote:
Note on overexposure: All m and K lenses progressively overexpose on the K10D as you stop down. A fix for this is to replace the focus screen with a DS screen. This solves the problem while leaving correct exposure with the newer A;F;FA;DA lenses unafected.
I ran some tests on this, and it seems that the over exposure is generally 1-2 stops, and levels out at between F5.6 and F8. from there to F32 it seems to come back about 1/2-1 stop. The best way to set exposure, I have found is to do some trial shots on a medium grey surface, (like a road or sidewalk) and look at the histogram. once you get the exposure set, leave it until the light visibly changes. This is no different than what people used to do with many manual only cameras.
09-07-2007, 05:57 AM   #12
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QuoteOriginally posted by Lowell Goudge Quote
Note that in V1.3 of the firmware pentax increased the time the lens is stopped down by almost a factor of 2. this is undocumented in the upgrade
I haven't upgraded to 1.3 yet. Do you know if this affects the metering?


QuoteQuote:
You can also press the green button while doing this to set exposure, and pentax rep's at one time suggested this was a better way to set manual exposure
I will give this a try. Do you know if this affects the metering at all.

QuoteQuote:
I ran some tests on this, and it seems that the over exposure is generally 1-2 stops, and levels out at between F5.6 and F8. from there to F32 it seems to come back about 1/2-1 stop. The best way to set exposure, I have found is to do some trial shots on a medium grey surface, (like a road or sidewalk) and look at the histogram. once you get the exposure set, leave it until the light visibly changes. This is no different than what people used to do with many manual only cameras
I found overexposure to vary between lens. I didnt do any scientific tests but seem to remember that almost all lenses would expose ok-ish at or near widest, and then would progressively overespose. from the f8 you suggest that seems to be how i remember it.
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