Checkout this thread
https://www.pentaxuser.com/forum/viewtopic.php?t=2580 it might help.

I would try taking a few shots with the filter off and see if you get the same/different result. If the lenses image circle is a very close fit to your sensors dimensions or it is slightly off centre (unlikely), vignetting may occur.

Q: Is the vignetting more or less uniform at each corner of the image?

Which lens exhibits vignetting. The 24-90 certainly shouldn't unless you have too small a hood on it. I've never noticed it with my 16-45 on my D either. Maybe your filter is causing it. You'll see other threads on here about opinions on filters. Personally, I can't see the point of buying a very expensive lens high quality lens, then limiting its performance by putting a cheap piece of glass over the front of it.

That seems a lot of expense for a couple of pics. Why not hire them or use 2, 3, or 4, flashes?

Thanks Drew. I had to re-read it a few times myself to make sure. At least we've comprehensively straightened out which lense work with which cameras. Georges summary above is so much simpler to understand than my ramblings.

George, you ought to publish that and have Pentax attach it as a little 'sticky note' to all new cameras

Cheers,

Drew,

I think that is what I have written, but slightly differently. I guess how one achieves 'stopped down metering' differs somehat from body to body and person to person. I simply use the 'green' button atop my D. I'm sure that the DOF and AE-L buttons probably work on the istD too, but I haven't tried.

It is very odd that, when using the pre-A lenses in Av mode, they do stop down . . . too late . . . after the exposure is made at full aperture. I can't fathom why.

Cheers,

Matt,

Fortunately for me, I bought a new Super-A in the 80's and it just went on taking great pics. My next film camera was the MZ-S which I still have and bought after my Super-A became uneconomical to repair. Consequently I'm somewhat lacking in knowledge of all the other film models in between. I did have an MZ-6 for a while and an *ist (didn't like it, too small). Oddly, I was never compelled to have the latest & greatest of the film world. That's all changed with digital. I had my Super-A for the best part of 20 years. I kept my DS for about 18 months, and I've had the D about a year. Now I'm looking seriously at the K10D . . . and this is within 2 years of having my first Pentax Digital SLR (assuming the K10D comes out before next summer ).

How times have changed.

Regards,

Thanks Matt, I had completely forgotten about the *ist but I'm surprised to learn that the Z's and older MZ-?0's can use them. We live and learn.

It is surprising to me how often this question, "Will my old lenses work . . .?" comes up, and "Will xyz flashgun work with abc camera?". Maybe there's a case for an FAQ forum for members to browse in read-only mode but maintained by forum administrators (as if you haven't enough to do). I'm sure many of us would have some sensible contributions.

Cheers,

If your lenses have either Pentax, Takumar, or Asahi Optical on them yes, they'll all work. Pentax's biggest selling point, apart from their excellent hardware, is that all lenses ever produced by them will work on their new cameras. Some with restrictions however. Some third party lenses have issues but I'll not cover that here.

In a nutshell, all SMCP-A series lenses (the ones with 'A' on the aperture ring) and newer will work with all Pentax digital cameras without a problem. If your camera has a custom setting to allow the use of the aperture ring in other than the 'A' setting, you can also use the aperture ring at any aperture (but frankly there is no need as you can set the aperture on the body).

All previous 'K' mount lenses will also work using Manual exposure mode and stopped down metering to set the shutter speed. These lenses will also work in Av mode, but the picture will be taken at full (wide open) aperture, the lens aperture does not stop down until after the image is taken for some obscure reason.

Old screw mount lenses will also work with a M42-K mount adapter in the same way but you have to set the lens to manual. If in auto, the lens will stay wide open as there is no actuator in the camera for the 'auto' pin.

Conversely, the newer FAJ and DA series lenses having no aperture ring will not work on film bodies where the aperture can't be set on the body (all of them I think).

Regards,

Since the original post dates back to November 2006, and the OP has not been back since with any kind of comment, one can only assume that he has answered his own question.