I've not found a Pentax lens yet that's been a problem in that way, but I doubt that any of us have tried them all with IR in mind.

Manual lenses tend to have IR focusing marks, so that could be useful. A series lenses would be the most convenient as they will meter and stop down correctly without any hassle. However, some AF primes may also have IR marks, so they can be used manually anyway.

We went to camera fairs for a few years, but eventually found that the same stuff and the same people were just endlessly rotating, with very few new things appearing. The exception was when somebody started selling a huge collection of Exacta SLRs and accessories, which must have been amazing for Exacta collectors.

As for Pentax, too many badly looked after lenses and bodies, but occasionally.....something magic!

What sort of finish is the lens? Some Sigma lenses have a rough finish that I don't particularly like, some have a smooth finish. Sorry to be pedantic, but when you're handling a lens it's important if feels right in use.

The K10D needs firmware 1.30 to use SDM, so anything prior to that should do the trick.

I would phone JPS and talk to an engineer to check how you should do it.

On the other hand, the complete full version of Photoshop and Lightroom can be had for less than £10 per month and that is regularly updated.

That would add some significant functionality.

Doesn't sound like they've heard of Customer Service, more fans of Basil Fawlty's style......

Still, at least you now actually have it.

Hope the foot is back to normal very soon!

If it's consistent, it's predictable and doesn't seem much of a problem. Incidentally, even if the camera indicates 1/800s the actual shutter speed might be something close, such as, say, 1/760s or 1/820s.

Given that every image is given a quick tweak in Photoshop it should be fine.

The metering is complicated by the fact that the amount of IR light varies and, as you say, the meter measures visible wavelengths by and large. Live View would be helpful.

The technique is to meter without the IR filer, then fit the filter and adjust for the IR focusing mark and simply adjust the exposure by the filter factor. From memory this might be three stops, but full instructions will no doubt be available via a Google search.

It can be a bit hit and miss, but when it's right it can be really spectacular.

The manuals are not printed as well as they used to be, but we should probably be grateful that we get a manual at all. It's better than being directed to download the manual and print it out ourselves.....

Thanks Gareth, the new link works fine.