duncsuss

Lives in United States Boston, United States
Joined on Jun 7, 2007
About me:

Pentax K10D
-- smc Pentax DA 50-200mm F4-5.6 ED
-- smc Pentax-M 50mm 1:2
-- Tokina AT-X 28-85mm 1:3.5-4.5

Olympus C-5050z
-- Olympus PT-015 u/w housing

duncsuss' recent activity

  • I've got the Tamron 19AH too -- and it's a very nice lens. I can't say that I prefer it to the Vivitars, though. Perhaps it's just my copy, the zoom and focus mechanics are very light to the touch, ...
  • I'm not certain I understand your criteria exactly, but I have a manual-focus f=28mm lens with front glass diameter 29mm. The housing is significantly larger, but if it is purely the exposed glass ...
  • Peter, I wonder if you have any evidence (apart from "it looks the same") to support your assertion that these two lenses share anything beyond the zoom range? The Pentax has a constant aperture ...
  • Vivitar S1 / Pentax-A K-mount / KA-mount 15 elements in 10 groups / 13 elements in 10 groups weighs 879g / weighs 680g filter 67mm / filter 58mm It doesn't look like they are closely related to me.
  • I think it came first. Very solid, but weighs less than the S1 70-210. I don't have any shots that can be compared side-by-side, but have no reason to think badly of it. Perhaps a little more ...
  • I have the same version of the lens in screwmount. Plus a couple of the earlier non-S1 75-205mm zooms, also Kiron (serial #s starting with "22").
  • This is the best information I've found on the variants of the Viv S1 70-210 zooms: http://www.robertstech.com/vivitar.htm
  • Maybe I didn't get the terminology correct. But one thing I do know for a fact -- the Nikon D70 had x-sync up to 1/500 shutter speed, so clearly nothing has to be invented. According to the spec in ...
  • One of the great advantages of an electronic shutter (IMO) is that it's possible to get really fast flash sync. For example, it's very useful for fill-flash on a bright sunny day when I don't want ...
  • My first thought was cropping so that autofocus can more quickly track a target.
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Total messages 925
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Last entry Aug 10, 2012
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Last upload Aug 10, 2012