Robert Schroeder

Robert Schroeder

Lives in Germany Germany
Joined on Jul 2, 2004

Robert Schroeder's recent activity

  • You know there used to be a Four Thirds mount version of that lens, too? I once tried a used copy, but, if I remember correctly, it was somewhat decentered, too, and anyway, to me, it didn't seem ...
  • Are humans not nature? ;-)

  • Alan WF already gave a comprehensive answer, I think. In short: The reduced focal length is not just an altered "effective" focal length, it is the "real" focal length of the whole optical system. ...
  • True, but then again, the XE (XE-7 in North America, XE-1 in Europe) already marked the beginning of Minolta's long cooperation with Leica, it was the base for the Leica R3 :-) There wasn't the ...
  • Allow me to disagree ;-) – while I agree with regard to the XE (the black plastic prism box really looked ugly on the silver body and in any way was a disgrace for the otherwise robust camera), I ...
  • Right, thanks for correcting... It was of course focus shift what I meant... Did I mix up anything else? ;-)
  • With both (D)SLRs and mirrorless cameras, actual full aperture only – except if and only if the lens suffers from focus breathing severe enough to let the focus become off when stopping down after ...
  • LMCTFY: To customers who use them to maximize their profits, thereby helping Raytrix to maximize their profits, too. WIthout profit, things and ideas, however sensible, useful, pioneering or...

  • Very interesting! Indeed, I would have expected more from the focally-reduced Tokina, too, at least in the frame centre. On the other hand, I have no idea how good (or bad) the lens is on it's own. ...
  • Sounds plausible. If you look at many current lens designs, especially some of those which are designed with attention to image quality, like a few newer 50mm f/1.4 designs or even most of what ...
  • Replied in "White Papers"
    As Sittatunga already correctly stated, an optical system does not create more than one image. There can only be one, and It is the one that comes to existence on the focal plane, i.e. on the sensor. ...
  • Interesting. Although I know Metabones has different optical designs for their MFT and APS-C Speed Boosters, I just didn't realize it must be the same with the Lens Turbo II, in order to correct ...
  • Yes... "Prone to vignetting" with telephoto lenses "starting at 135mm", because 135mm is the shortest focal length of which I've seen one or two reports of such vignetting. If I sounded like every ...
  • That's for a single, "thin" lens. For a more complex optical system it's a bit more complicated. Not quite. There's only one image, and that's what is projected on the sensor. What the focal ...
  • Replied in "White Papers"
    This is not about whether we call the combination a lens or something else. It's about what it does. But as your arguments to the latter seem exhausted, I see nothing new here to argue against. ...
  • From what I've read and seen, it doesn't happen with all of them as it somewhat depends on the optical formula, and it tends to happen the more the longer the focal length is. And some who have ...
  • Replied in "White Papers"
    Easy to answer. For two similarly good lenses, the combination of the longer lens plus Speed Booster will give a very similar image in all aspects (field of view, depth of field, brightness, ...
  • As far as I'm informed, the Lens Turbo II's quality is good and comparable to the expensive Metabones Speed Booster, but because of the limited diameter of the optical group it is prone to severe ...
  • Who would've thought that you can turn a mirrorless system camera back into an SLR!
  • I, too, think that for wide-angle I don't need perfect ultra-fast AF. Sounds good so far. Probably not yet; I've just decided to see whether I can get my old Zuiko Digital 11-22mm f/2.8-3.5 ...
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Total messages 1609
Threads started 34
Last post 3 weeks ago
Total comments 173
Total likes 481
Last post 1 month ago
Total reviews 1
Last review Jul 2, 2004
Entries 1
Votes cast 0
Last entry Apr 25, 2009
Photos uploaded 19
Last upload Jul 10, 2011