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Forum: Pentax DSLR Discussion
05-22-2009, 03:26 AM
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stevebrot: Interesting that the problem is alluded to in the manual. I keep forgetting that I don't actually have a K10D but a Samsung GX-10, and I've not seen any mention of this in the GX-10 manual.
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Forum: Pentax DSLR Discussion
05-21-2009, 11:14 AM
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Lowell, you are evidently a patient man - most commendable!
What strikes me as strange about this whole business is that the error was not picked up by Pentax before going into full production. It's not a subtle, hard to reproduce problem - I was surprised how gross the error was (at least with the lenses I've tried), even after reading about it here. Am I right in thinking that it does not apply at all to A series lenses? Unfortunately I only have 1 of those (a 28mm), whereas I have 35mm, 50mm, 135mm and 300mm prime lenses and an 80-200mm zoom all in the M series (along with a couple of Ricohs).
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Forum: Pentax DSLR Discussion
05-21-2009, 10:05 AM
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Lowell, thanks for that - you were one of the people I hoped would reply! I'll give the testing a go - I imagine Photoshop will have something comparable to the PSPX2 feature you use.
If you are not using the LL-60 screen (or the one from the *ist), am I to take it that you do the kind of overriding of the metering that we're talking about? or does your split image screen sort the problem?
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Forum: Pentax DSLR Discussion
05-21-2009, 09:33 AM
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I've read quite a bit now on the web about the exposure problems associated with using pre-A series lenses on the K10D (the stop-down metering is inaccurate and the error varies with aperture). I've run into the problem myself, with overexposed images at small apertures and underexposed ones at large apertures. A number of people seem to have had success switching over to an LL-60 focussing screen, and that's a route I may have to go down, although I'm nervous about the work involved in swapping the screens over. In the meantime, though, I was hoping I could kludge around it by metering at a certain known 'good' aperture and then making the necessary adjustments for the aperture / shutter speed I want. Have others found this to be a successful (albeit fiddly) approach? To that end, I'd need to be sure that a given aperture does have a correct exposure, for which I imagine I need to use the histogram. Any tips for doing this 'calibration' would be most welcome - I'm something of a newbie in this area.
On the subject of histograms, am I not right in thinking that the histogram should not vary at all according to aperture (as long as the corresponding shutter speed is set, of course)? Solid evidence of this metering problem is provided by histograms which are different for each aperture, the apex of the curve moving over to the right as the aperture reduces (i.e., f-stop increases).
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