Help needed.

Started May 5, 2014 | Questions thread
Nordstjernen
Nordstjernen Veteran Member • Posts: 6,876
A lens issue

VirtualMirage wrote:

I use EFCS all the time and I have never had any issues with high shutter speeds, even as high as 1/8000s.

Depends on the lens.

With most lenses I don't have problems, but with some lenses I get this dark upper part of the frame from 1/2000 sec when cusing first electronic shutter curtain, even with astronomical telescopes without any diaphragm mechanism.

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