Generally... but don't forget that the aperture chosen is based on a Ev graph (remember those printed in the old Pentax SLR manuals??) The MTF program mode has a kind of "shelf" where the MTF aperture is chosen, but only up to a point. If you fiddle around you can discern what the MTF of the lens is (ie you'll have to point the camera at a bright enough light source to suss it out).

Goodness only knows how auto ISO folds into the mix

Best thing is to download a Z1 PDF manual and take a look at the chart.
(e.g. page 127 of the Z1-p manual)
Matt

Which is what I said before


But the additional info is helpful

If you actually want to find out the MTF manually then it's a long winded process. Have a look at http://www.imatest.com/

Matt

The MTF information is actually stored inside the lens
And it's not always f/8. Some of the lenses I have are f/5.6... and some other values I can't remember...

Matt

If you use Silkypix (especially for shooting RAW) then that includes basic horizontal, vertical distortion correction as well as pincushion/barrel distortion adjustments.

Very helpful

(And it has CA adjustment too )
Matt

Huh?
That's why the centre black bar is so large - to filter out any focus point offset. The focus test chart at 45 degrees has such a huge and unmissable central target that the camera just has to get it.
Ok, so the focus point may be a fraction out (looks less than 1mm for that view), but looking at the 45 degree shot the K10D was a full 40mm back-focussed

That's definitely not to do with where the focus point sits in the viewfinder... that's back-focus error.

(And in fact, it was about the same amount as mine before it was adjusted. As I said, even the 12-24 at 12mm at f/8 you could see it had back-focussed even on a landscape! Having adjusted for a f/1.4 it's great on 12mm )

Matt

The general setup is this:

1. Get the fastest lens you have (an f/1.7 or f/1.4 is a good choice)
2. Use the focus chart
3. Set the camera on a tripod, pointing at 45 degrees to the chart
4. Get the K10D into debug mode
5. Using the AF focus adjust menu, make a note of the current adjustment (measured in "nm" I believe).
6. Use the adjustment to shift the focus - try a smallish value (say 40) first.
7. Take a test shot and zoom into the playback to see what numbers are in focus on the RHS of the shot.
8. Adjust the focus and repeat until happy
9. Once happy, turn off the debug mode

You can try with other lenses, and there may be a small amount of variability between lenses, but you should be able to get it far better than you are showing now!
Matt

EDIT: Did some digging and found this link on DPReview.
Originally from RiceHigh's blog.

You may find this quote useful:
As usual this info is provided AT YOUR OWN RISK, etc, etc, etc (For Vista users, read this thread)

Apparently Pentax have their own software that allows focus adjustment of up to four lenses, but this little "hack" just enables and disables the Debug mode via USB (perhaps they completely removed the awkward button option!)

I'll keep you posted
Matt

The appearance of back focus will seem different based on aperture. So, if you test with a 50mm f/1.4 wide open at f/1.4 you'll really, really see any back focus issues (that's how I sorted mine - which also showed that shooting with the 12-24 was also backfocussing and is now fixed).

With the K10D you can't adjust on a per-lens basis, but given the above point it's unlikely that you'll need to

It's not difficult really. Just a bit fiddly (mostly because no one seems to know how to adjust with the new 1.3 firmware So you have to get v1.1 back in the camera... which is a little tricky, alas).

If you were closer, I'd say pop by and I'd sort it out for you (takes 30min max)... if you're ever in East Sussex, drop me a PM
Matt

My K10D back-focussed exactly the same way

You use the 45 degree one and select centre focus. That way (as in your case) it focusses on the big (unmissable) black bar in the middle. With your example you read off the numbers and check what's in focus - around 30 to 40mm back is what I see.

If all your lenses behave this way, then you'll need to adjust the K10D focus (you need a v1.1 firmware... see other threads here).

Took me about half hour to tweak mine and the K10D has been a different camera ever since

Matt

Unless you used Layers and saved as PSD then you have absolutely no way. All the history information is discarded when you close the file.


A lesson learned??
Matt