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bravocharlie

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  1. Tried all the suggestions here to no avail. Interestingly, when I locked focus on a high contrast subject without the filter band then slid the filter into place the image immediately went very soft. Pressing the autofocus button showed the green "in focus" light, yet the image was still extremely soft. Trying to manually focus made no difference. fugu82, I would be interested to know what make of 10 stop filter you used.
  2. Thanks for your reply. I have no experience of solar filters so I don’t know how they compare with normal ND filters but this problem has been found on two separate XT2s with different 100-400 lenses. In both cases they were focused firstly with the filters in place and then with no filter, the filter being added after focusing. The point here is that in the second examples the cameras had achieved perfect focus before carefully adding the filter whilst ensuring no change in focus or zoom. The result was a VERY unsharp image in both cases. I therefore do not believe that this is a focusing problem and having read the post by mdotson90 above I think that it may be that placing a dense ND filter in front of the lens renders it unable to produce a sharp image even if it achieves focus.
  3. Thank you so much for your well considered and comprehensive reply. I was fairly sure that this problem was more to do with asking this lens to do what was probably technically impossible but nevertheless I was still a bit mystified. I would not normally use this filter at such extreme focal lengths but we all want to know the extent of the capabilities of our gear so I thought it worth a try. In answer to your last point, solid Gitzo tripod wth quality head, minimal wind, OIS off and self timer set. Interestingly I have had superb results with the 50-140mm lens using the same filter. Thanks again for your response..
  4. A friend and I both have XT2s and 100-400 lenses. We have both tried to use a 10 stop ND filter at 400mm and it is impossible to get a sharp image at any aperture. At 100mm it seems ok and both lenses perform superbly without filters. Fitting a 10 stop ND is not something I would often want to do but I would like to know why this is a problem. Is there some technical reason? Has anyone else experienced this?
  5. I would also love a 5x4 crop with the next firmware update. At present I use the 6 x 4 grid overlay in the viewfinder. This makes it easy to compose in a 5 x 4 ratio. In the menu go to set up, screen set up, framing guidelines. Not as good as the 5 x 4 crop I had in my Nikon but manageable.
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