Archived posting to the Leica Users Group, 2014/05/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Try the Zeiss ZF.2 25/2 and Sigma Art 35/1.4 if you can, I think those are currently regarded as the best lenses in those focal lengths for Nikanon... john -----Original Message----- Both good points. I guess my response to the one would be that high-resolution FF-sensor cameras will be used in the same way that MF cameras are used. All the images I made here were done hand-held (carefully) and I don't see evidence of movement smear. As for the other, I cop to carelessness. I should have set things manually, with a wider aperture. That said, however, I just repeated this test, and found that the f/1.4 24mm and 35mm primes (the current G models) don't give up much in being stopped down to f/10. But rather disturbingly, I discovered that the camera autofocuses both lenses, especially the 24, PAST the infinity mark on subjects that are effectively at infinity, like the house in the pictures, about 300m away. I found by manually changing the focus setting that best focus is achieved when-surprise!-the index mark points exactly to the middle of the "infinity" symbol. The error is hardly noticeable at apertures of f/5.6 and beyond unless the image is examined at high magnification. But at f/1.4, it doesn't take close examination at all. At the same crops used in the examples I posted, the autofocused image at f/1.4 was horrid. The only thing that saved these images was that they were taken at small apertures. It's difficult for me to envision where this error arises, since the camera's autofocus optoelectronics examine the actual image, not a surrogate like a split-image RF does. I haven't experimented at closer distances, or with other lenses (yet) but clearly the function of these two is highly compromised by the present state of affairs. Also inexplicable to me is why there isn't an infinity stop on so many current lenses! Not sure what my recourse is for wide-aperture use, other than manual focusing by the index mark for subjects at infinity. At any other distance, manual focusing through the finder is more inexact than the AF. Nikon servicing? Nikon user forums? -howard On May 5, 2014, at 12:41 AM, John McMaster <john at mcmaster.co.nz> wrote: > Just taken a look at your settings, not sure what Nikkor lenses you are > using (or their quality) but you have stopped them down so much that the > D800 will be hit by diffraction limitation, try again at f5.6 or f8..... > > john > ________________________________________ > > The other thing, other than how an end image looks, is that as pixel count > increases the camera has to be held steadier. At ~36-40MP and you are > looking at faster than 1/3xFL as minimum to hand hold IMO, higher MB backs > are usually used on tripods. > > What size output are you envisioning that will need this resolution? > > john