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Weird shadow at the top of pictures

Started Sep 2, 2018 | Discussions thread
brightcolours Forum Pro • Posts: 15,885
It can be the camera

Matei111 wrote:

Tair-3 is a vintage soviet lens. It was meant for a 35mm Zenit camera. It has 300mm (480mm on my crop sensor) with f4.5.

I also took more pictures in the last days. I don't think it is a sensor or mirror issue because with othere lenses I have no problem (I tried the EF-S 10-18 and the EF-S 18-55).

The strange thing is that it happens especially when shooting against the sky.

Those two picture were taken with same apperture, same ISO, the only difference is in the shutter speed. You can notice how the picture that frames the sky at the top appears to have the black gradient.

However, I noticed that this issue only happen at f4.5. When I switch it to f8 there is almost nothing.

Photo taken at f4.5

Photo taken at f8

I have no ideea what this might be, but it very weird.

What I notice is the exposure time difference:

1/4000th sec big issue, 1/2500th sec big but lesser issue, longer exposure times no issue.

Try with a normal EF lens with 1/4000th or 1/2500th sec and see if the issue is there or not?

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