Problem with Sony A7, reflections on the sensor.

Started 9 months ago | Discussions thread
blue_skies
Senior MemberPosts: 7,138Gear list
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Re: Confirmation ...
In reply to bjhk, 8 months ago

bjhk wrote:

blue_skies wrote:

blue_skies wrote:

bjhk wrote:

You better go through the thread.

I finally did - most at least - and I still repeat what I noticed earlier:

To get this type of reflections, I noticed that such shots are stopped down and over exposed.

If you use a wider aperture, and exposure normally, or under-expose + pull shadows, the reflections are far reduced, and may not even be noticeable.

The other factor that seems to play is the rear-exit-pupil distance, or better, in this case, the position of the lens closest to the sensor as one, or the other seem to be reflecting back and forth.

If you switched to an SLR lens, the problem may go away (or be no worse than a DSRL).

Lens coating and sensor topping may play a role. It is interesting to see that Leica cameras are 'clean', but Leica has only one CMOS model out today (M240), so we may be comparing apple and oranges here.

Or, as remedy - if you shoot stopped down and over exposed, use a SLR lens. If not, try a wider aperture and expose normally (or for the highlights at night), and avoid sun-shots.

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Cheers,
Henry

Something everyone can try out for themselves.

I used a CV lens for this (35mm Nokton) and just took a nightshot on my driveway (outdoor house lights).

At f16 and f22, I noticed the light glare with multiple reflections at the lights. Heck, there was even a center reflection of the aperture itself.

But at f/5.6 and wider, the reflections had pretty much disappeared.

Again, don't over-expose and don't stop down too far, or use an SLR lens(?) and you will be fine.

-- hide signature --

Cheers,
Henry

Most of the following are quite wide open

Hard to tell - some are with fast lenses, but a few were definitely shot stopped down - look at the DOF in the image.

All of them are over-exposed though. I see this in my images as well. Only when I reduce the exposure levels, the halo's and reflections disappear.

http://farm8.staticflickr.com/7348/11686024844_6ae5806105_c.jpg

http://farm3.staticflickr.com/2830/11686025324_07fe86b5db_c.jpg

http://youtu.be/G87zTTBLRs0

http://youtu.be/WnkxHGskGzo

http://farm3.staticflickr.com/2837/11515763043_ccb5ef0ad6_h.jpg

https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-prn2/1526950_10152110317659684_664384378_n.jpg

http://www.vahonen.com/2013/A7temp/20131211_213107_35mm_f1.4@f1.7_ISO250_flare.jpg

http://lh3.googleusercontent.com/-0dLJ728ukNU/Ure1qwVIneI/AAAAAAAADtE/h0AXGIukpq8/w1000-h381-no/_DSC0208-flare.jpg

http://www.alphafans.net/data/attachment/forum/201401/03/191900ujel6p4v49v00dvd.jpg

http://www.alphafans.net/data/attachment/forum/201401/03/191917v0mzptax1q6d16sd.jpg

http://www.alphafans.net/data/attachment/forum/201401/03/192046bfh2ifx7d4zlb44h.jpg

http://www.alphafans.net/data/attachment/forum/201401/04/000125k48g04b6ggoh3fo1.jpg

http://www.alphafans.net/data/attachment/forum/201401/04/000239gd7kv5pvqsfls8dd.jpg

http://farm3.staticflickr.com/2830/11686025324_07fe86b5db_c.jpg

-- hide signature --

Cheers,
Henry

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