[Guest]

Hi Klaus



I'm very interesting to this test because I have this lens

and I'm not pretty happy with its performance although I knew -prior

buying it- that I would normally expect quite mediocre results and I have

tried hard to get usable results. Thus, I'm curious what results

you'll get from your side as also as the quality of the sample photos.



The key is to have a very stable tripod, Mup, wireless triger and

super-extremely careful focusing.



This lens is able to focus very close thus you can use the imatest chart

for resolution testing but I believe that close focus is not its strong

point and the results will be disasterous. I believe its best performance is around

300 meters away.



I would be interesting to see whether the T-mount adapter makes any difference

regarding its space from the sensor, given that the focusing ring has a lot of space

past infinity in order somebody to use a quite thicker T-mount to increase

sensor distance from the lens.



I find that the best use for this lens is videography which does not require

much resolution from a lens but the 800mm focal length is wow for some

video applications e.g. sunset, wildlife, moon.