Frage von kreativfactory:
I've just added a new elite with the Letus SonyEX-3 (the special achromat is indeed tested included) and found that if the optimum focus is set to the middle of the ground glass, the edges are somewhat blurred. Alternatively, I can adjust the sharpness of the edge area, then the center of this is not optimal. Question: is this usual or is the achromat designed not quite 100% for the EX 3rd
Can we expect a 100% sharpness over the entire focusing screen?
'm Happy about your experiences and feedback.
Greetings Roland
Antwort von Chezus:
The Picture-itself would be completely sharp, not only in the middle or s.Rand.
Possibly. you have not yet purely zoomed far enough. So far zoom in, until no vignetting is to see more
Antwort von kreativfactory:
Thanks for the quick reply. Reingezommt I have strong enough, I am safe on the page. Have not synonymous vignetting.
Antwort von Chezus:
is the uncertainty in all corners of the same?
Antwort von kreativfactory:
yes, the corners are the same everywhere blurred. If I set the focus to the edge, are synonymous, all sharp corners, but the center is no longer optimal. That actually shows that the ground glass is generally well adjusted and plan. My guess is that the achromat is perhaps not optimally corrected.
Antwort von kreativfactory:
nor an addendum: I did the test with a Siemens star, and there the problems are clearly visible. In the field tests (landscape, etc.) the problem falls on not so, but is still recognizable. Average is the thing already, but unfortunately not optimal.
Antwort von Chezus:
s.Achromat could really are. Würd ich mal contact the dealer. For me the problem occurs not on prop
Antwort von domain:
Zoom lenses are generally not optimized to the macro range, but vary widely in this area, a field curvature, synonymous with the double lens achromatic lens is not as easy to correct.
For perfect results, there is therefore in your own photography macro lenses, usually calculated as a fixed focal length and constructed.
Antwort von Axel:
With Letus Extreme + EX + EX3 Optimization Kit (standard optics) no blur fields in None EX-Focal, synonymous not fully zoomed. Gegentest: Without Lens stationary ground glass against the light (visible grain with peaking).
The KB optics can even produce sharp vignettes. Cheap poorly calculated. Good way extreme wide Anglehaben calculated sharpness still spherical fields baubedingt. Nobody can trick out the physics. Then, the Siemens-star benefit nothing.
Antwort von kreativfactory:
Have this test with the graininess of the ground glass synonymous performed. Also here: either I can set the optimum focus on the grain in the middle or at the edges. Maybe it's just a little too much glass (standard lens) for optimal results in between.
It is indeed Letus of a relay lens that is used instead of the standard optics and thus perhaps achieved more optimal results. But I can not afford this relay ($ 3,500).
But with you is indeed the sharpness with the standard lens io
'm A little perplexed when the fault is.
Antwort von Axel:
'm A little perplexed when the fault is. Since the Ultimate, I do not know, I do not know what it is with the "back-focus ring is" up. The most important of these is, of course s.Setup Back Focus, which tolerates no tolerance. He is the
depth, that is not in Comparison to the EX-adjusted Flange focal point of the KB-adapter, which can be naturally tilted synonymous, but. At the extremes with his three Seckskant indoor adjusting screws recalls s.einen song in which
Yabba-dabba-dooh occurs. German mowers seem to be precisely designed. Would consider this as a problem?
Antwort von kreativfactory:
So it is for the elite, but he has a back focus synonymous. The back focus, however, refers to the Flange of the superior lens and not the focus of the ground glass. Thus, the back focus does not affect the problem.
Antwort von Axel:
You're right. Other possibilities are the flange, with which the adapter is attached s.Filtergewinde (but the Flintstones' screws!), And (starting from the extremes) of the achromat itself Background: With the Extreme alone, you
have such a blur fields. Therefore, the oe kit that only one alternative and one achromat is 77mm flange (72mm Extreme is standard). Change the achromat is easy. It turns out, however: Can easily misunderstood. The so you could still check. Whether he is properly seated and (just how?) Whether it is the right one.
Antwort von kreativfactory:
Yes, thank you. I think that's the next measure. Sure times I go with my adapter to the Dealers and the flange ring and try to compare times, whether really the right achromat is used.
