dsjtecserv

dsjtecserv

Lives in United States Northern, VA, United States
Works as a Technical Director
Joined on Jan 21, 2005

dsjtecserv's recent activity

  • Replied in Nope!
    I suppose I wouldn't disagree with your point that there is a difference in quality. But I don't think that do to a greater tendency to post-process by FMers, I think it simply reflects a smaller ...
  • Replied in Nope!
    I still don't see any definitive, qualitative difference between them. Any of them could be from either source. Dave
  • That, correct, but it is determined by the relationship of focal length and focus distance. For a simple, thin lens the equation is: M = F / (F-d), where M is magnification, F is the focal length, ...
  • Comments on photos are more likely to be thoughtful and constructive, and good pictures recognized as such. Granted, there are plenty of reflexive "great picture" comments. But the substantive ...
  • I'm not sure your generalization about the characteristic "look" actually holds. But regardless a key factor is going to be that different photographers of different interests, experience, and ...
  • Not sure where you get that from the article, or anywhere else. If everything else is held equal (f-number, shooting distance, print size and viewing distance), and equivalent focal lengths (with ...
  • The DPR forums software originally didn't allow any editing; it was only after years of requests that they added that feature. I agree that it would be even better if it showed the audit trail of ...
  • No offense. Substantively changing a message, without disclosing that, after posting is a fairly major violation of online forum ethics, and accusations of that are not taken lightly, so it is ...
  • I didn't add to my post after posting. Are you saying that you did? Be careful there, my friend. The point is that regardless of what you do, if the framing of the subject is the same, the depth of ...
  • See my reply to your reply to Chris, above! Well, yes you kinda did. By suggesting using a shorter focal length, most people would assume that you would want the framing of the subject to be the ...
  • Your math is correct as far as it goes. But Chris is pointing out that DoF is ultimately a function of the degree of enlargement need from the capture (the size of the negative or sensor) to the ...
  • No, that won't work. Depth of field is a direct function of magnification. So for any given sensor size, if the subject is framed the same, it will have the same depth of filed. It wouldn't matter ...
  • I forgot that you mentioned that before. Go figure. Thanks for reminding me. OP, if you are using a Nikon dSLR in live view, then what I said doesn't apply. But I don't know if, in that case, ...
  • All cameras (as far as I know) that have autofocus do so at maximum aperture; that is, the diaphragm as open as it can be during focusing. It is not until right before the shutter is opened that ...
  • Me too. I hate it when people misuse apostrophe's. I would want to second Jay's appeal for patience. many of us have a long history with photography, and many of us have an innate sense of how ...
  • The two effects are unrealted. A CPL on a wide angle lens will reveal the gradient of polarized light that is present in the blue sky , but this differential darkening is not present across the ...
  • When you get into the range of 6 stops of neutral density and more, even the highest quality filters will produce some color cast. Without an ND, the light striking the sensor is primarily in the ...
  • You will need about 10 stops of neutral density. Each stop doubles the exposure time, so the exposure adjustment can be figured by (original exposure) x (2 ^ NDStops). So a 6-stop ND will multiply ...
  • Your problem would be the same whether a "walled funnel" were involved or not: you simply need to achieve greater magnification of your subject, so its image on the sensor is larger or, ...
  • Interesting; I didn't know that. On the Canon I can use the DoF preview in live view if I want, but I wouldn't want to have to try to do critical focus (either auto or manual) in that state. But I ...
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