Question about Pentax *ist DS Digital Camera

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Ist DS problem

So exactly two weeks after making my order at B&H, my package arrived! *ist DS, 18-55, 28-105/3.2-4.5, 1 GB Ultra II So far, things are positive. The 28-105 is great even on my MX, and if it had autoexposure, the kit lens vignettes at 18, but appears fine in my MX's viewfinder at 24mm. ISO and AF are miles ahead of my A80. The 28-105 does a bit of ping-pong occassionally, but the 18-55 is snappy. ISO 1600 is about as clean as 100 on my A80 (which is already a pretty clean P&S), although 3200 is quite noisy (about 400 on my canon). My Tokina doesn't seem to work well though. In the A position, it sometimes causes all the modes to appear as "Aperture Priority", and only with some wiggling or moving it back and forth out of A to numbered f-stops does it work automatically in P, Tv, and Av. Both it and the M50/1.4 work ok with ring-set apertures. What would you have to say about the tokina? i think it could be some loose connection, but I can't seem to isolate the problem. When it works, it works like any A lens. It would be nice to have autoexposure with that lens rather than manual, however simple AE-L can be. I am also going to purchase filters for every lens. Of the four lenses that don't yet have one, two are 52, one is 49, one is 58. Which brands are to be avoided or bought? The 50mm has had a Hoya filter on it for as long as I can remember, but it seems to be all right.

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I have a Tamron 28-200 that has the same problem. There is a little play at the A lock position on mine as well. I always make sure the aperture when in the lock position is all the way to the right, as that seems to work. The problem is definitely with the lens - it has the same issues on my MZ-7.

I suspect the aperture lock design, which originated with the old manual "A" series lenses may not translate well into plastic construction, and tends to wear out more quickly than their metal bodied ancestors. I have a 28mm "A" that is still in like new condition, though heavily used.

Posted on Jan 04, 2008

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