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Forum: Pentax DSLR Discussion
09-21-2007, 04:00 AM
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Your findings sound very strange to me. As the AF is measured with lens wide opened TTL-ly, I cannot see why the Av setting in the camera can affect the final achieved focus unless this Av value is *also* used as one of the correction factors (as a parameter) in the calculation / adjustment of the final AF point. But this looks rather illogical, technically.
Even if this is true, the outcome proves that this algorithm is just a failure, as the lens focus wrongly at wider apertures..
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Forum: Pentax DSLR Discussion
09-20-2007, 10:41 PM
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Frank, since you've just got your copy, why not exchange another to see if you have the luck?
But do note that Benjamin did have got 4 copies (IIRC) of the DA21 and he was only satisfied after several exchanges, even that was arranged by Pentax France. So, it seems that the DA 21 does have some kind of mis-focusing problem when used on Pentax DSLRs but at least Ben finally was able to get one which is accurate.
So, good luck and hope that next time you post you have got a good copy (maybe out of all those other numerous "lemons" in the pool).
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Forum: Pentax DSLR Discussion
09-20-2007, 03:51 AM
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IIRC, as frank said, nothing is different with the pictures (and thus there is also EXIF).
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Forum: Pentax DSLR Discussion
09-20-2007, 03:49 AM
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Forum: Pentax DSLR Discussion
09-20-2007, 02:36 AM
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Yes, it is just because with the Debug mode activated, the LCD is always turned on. So, it is not so practical afterall. The work around is that you turn off the main switch immediate after each shot but then it will be very troublesome then.
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