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I wonder if anyone has come across viewfinder covers for X series cameras? I know there is lots of advice that mirrorless cameras don't have a light path to their sensors through the viewfinder but I've had bad experiences using my XT2 for long exposure night images and with my converted XE1 for infra-red. Somehow unwanted light is getting on to the images in both cases.

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Hi Chris,

that seems unusual, yet if it is going to occur it will most likely be during long exposures. However, there is no light path from sensor to viewfinder - the connection is purely electronic signal.

If you really feel that unwanted light is entering that way try covering the camera with a layer or two of dark cloth. I've not had a problem with my IR converted XE1 either.

Can you post some images showing the problem?

Vic

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Hello Vic

Thank you for responding. The images I had in mind were some I took at night in Bath a year or so ago. I recall that it was dark but there was some overhead street lighting above and behind me. Searching my archive reveals that I must have deleted them as being no good for my picture library purposes. Next time I'll try a black cloth over the top and back of the camera during exposure as you suggest. For the converted XE1, I think I was confusing my IR sensor hotspot problem with the extraneous light issue.

 

Chris

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I've tried all of my suite of X series lenses except the 100-400 and the 50-140. So that's the 35mm, 60mm, 16-55 and 10-24. I think I'm finding the last-named the one where hotspots appear less frequently than the others. But none are hot-spot free. Which do you find works for you Vic?

 

Sorry, I've taken this thread a bit off topic.

 

Regards

 

Chris

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I don't know about the 100-400mm but I'll try it soon - I don't have the 50-140mm. Known good lenses 14mm f2.8 (the absolute best for IR to f8). 23mm and 35mm f1.4s are good to about f5.6 or a little less. 16mm f1.4 is good to f8. 60mm f2.4 is no good at any aperture likewise the 18-55 zoom. The 55-200mm zoom is excellent at all apertures and focal lengths as is the 90mm f2. 16-55 works for me too although I don't have a lens filter to fit that lens, the basic conversion (580nm) shows it to work well (whether a lens filter might interfere with the light path to give a hot spot is another thing). I mostly use a Hoya R72 (720nm) on my lenses and sometimes 850nm (B&W). My favourite lenses for infrared are 14mm f2.8 and 55-200mm.

I've read that 10-24 is not good.

I have read that the f2 Chrons are ok for hotspots and I'm hoping the new 16mm f2.8 will work although I'm happy with the 14mm and cropping if necessary. I don't shoot IR with much else than the 14mm and the 55-200mm.

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