bob5050

Joined on Jan 1, 2013

bob5050's recent activity

  • Replied in Meteor impact
    ... it is well informed fact ... Had I this level of certainty about a market's future, I wouldn't be hanging around here; I'd be busy with my broker making the appropriate highly leveraged ...
  • Actually, if money were no object, what I'd probably really want would be a bearer.... Someone who could always speedily pass me a body with just the right lens mounted. More seriously perhaps, ...
  • Since you generalized this to 'Often ... an OP', I'll take it you didn't mean this case. But to be more specific about the use (past the example picture): I try to travel with a very light kit. I ...
  • Don't know--its weird. The Sigma site clearly says that OS isn't available on Pentax or Sony mount versions. On the other hand, The Amazon listing specifically calls out the stabilization for ...
  • Okay, thanks. I tracked down the source of the bad info. "As we've already mentioned, the Sigma 17-50mm f/2.8 OS lens uses an in-lens Optical Stabilization system. On Pentax bodies, this system can ...
  • Thank you very much to all who responded--I read each and every post with interest. I posted a few sample shots of the use situations, and felt that the answers considered those and were generally ...
  • Created discussion thread 17-50mm lens compare
    Anyone who has used both the Tamron and Sigma 17-50mm lenses? The Sigma is more expensive--is it really a better lens? How so? Use--I'm looking at this as an evening walk-around lens where my ...
  • There's not much meat to the first assertion when in the second you define 'quality' so broadly as to mean anything. A more specific observation, for example that Sony seems to have taken a lot ...
  • Created discussion thread when would both these things be true?
    In another thread I don't care to extend, the following two statements were made > I usually shoot wide open > I simply cannot use a camera with cramped up AF points only on the center To me, the ...
  • Created discussion thread Price drop on Sigma for Pentax lenses
    Noted today the the prices of the Sigma Art 35mm, 18-35mm, and 30mm prime all dropped by a hundred dollars this morning. Multiple vendors, so must be a Sigma thing. Just ordered the 30mm F/1.4 ...
  • I'd guess that this is a temporary situation, based primarily on the economics of chip manufacture failure rate. If you think of manufacturing fail rate at the level of the photocell, then a cell ...
  • Obviously not--all other things are never equal, and there are additional considerations like individual photocell size (where smaller cells, higher density trades off higher resolution vs greater ...
  • It's not a boolean where weight either is or is not an issue. Different people have different tolerances, and different senses of the sweet-spot in the trade-off between how much IQ/resolution ...
  • a thoughtful response, but I still have some quibbles: Everything's a compromise until infinite resolution can be had at trivial cost and size <g>. We could all carry medium or large format ...
  • Created discussion thread personal take on post K-3 upgrade path
    I've never understood the push for photo/video convergence. ISTM that SLR technology is inherently a photo thing. If I wanted to take movies, I'd get a movie camera, or switch to mirrorless. Full ...
  • Concur--very good post. The changing environmental factors here are significant, and should be the starting point of any analysis. ILC camera makers have to adapt--they do not just compete with ...
  • Whereas I own a 'plastic fantastic' Pentax 35mm f/2.4, and am saving my pennies for a either the Sigma 35mm f/1.4, or the 18-35mm f/1.8. Both are significantly larger, and significantly more ...
  • My complements and respect--some really beautiful work there. bobD
  • Background: I used a K-30 for about 3 years before upgrading to a used K-3. Loved the K-30, and love the K-3 now. I do landscapes, but also street scenes and interiors--all hand-held. The primary ...
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