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06-23-2007, 06:55 AM   #1
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K mount lens on K10D, restrictions?


What restrictions are there for an older K mount lens on the K10D?

Just set it to "A" and manual focus?

Anything else?

Does the focus indicator lock when you manually focus???

Thanks to All!

06-23-2007, 07:37 AM   #2
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If the lens has an 'A' setting there aren't any restrictions, other than focus. You can set the focus indicator with manual lenses in the custom setup (like 'FI with S Lens Used' or similar Japaneselish setting).

With the M-series and K-series (originally just the SMC Pentax lenses with no M or A after the Pentax) you must shoot in M mode and use the 'Green Button' to get a meter reading. With those lenses, you can only select center- and spot-metering as well. Flash must be adjusted and fired manually, too.
06-23-2007, 01:27 PM   #3
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I posted this to another thread with basically the same question. Yes the focus assist will work with any manual lens as well.

here's the previous post:

I agree that all (even screw mount versions w/ adapter fit) including almost all other K mount 3rd party or other brands.

But want to add a qualifier to the thread. Newer Ricoh K mount (PK/R Mount ) lenses look the same as their older versions that DO fit Pentax. But the ones with the "Program" button will jam on a Pentax K mount AF body. The program pin on the mount will drop into the AF drive slot and jam on the camera before the lens locks in place. It is a bugger to get off the camera and often will require a trip to the service shop to remove the lens.

Also there are some (Vivitar and maybe some others) that have a longer collar that sheilds the aperture link tab. These were designed before AF was introduced with the SF series. The older cameras had a more wide open Mirror bucket. Once AF was introduced the Mirror bucket was partly taken up by contact pins and the AF motor. The open space behind the camera's mount was reduced and these lenses will not mount without cutting part of the collar off the lens. So if you are buying one of these older versions make sure the collar is the same size and length as a Pentax K mount lens. (99. % fit just fine without worry and this longer collar was rare)
06-23-2007, 06:35 PM   #4
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Restrictions for K mount, (not KA mount, no electronic contacts) are as follows.

Must shoot in either manual, and use the green buitton to set shutter, or stop the lens down with depth of field to meter, and adjust both shutter (on the camera) and apature (on the lens)

or shoot in apature priority with lens wide open.

Also note flash metering does not work unless wide open.

For flash, if you have the AF540 FGZ you can set it to "auto" and then it is just a matter of setting the ISO and Fstop oof the lens on the flash and the sensor in the flash does the job. (just like 1980)


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