Does anyone have any experience with the Tiffen "Hot Mirror" filters on a digital camera? They are supposed to remove a significant amount of the infrared component of the light reaching the CCD, which, due to its extended sensitivity to infrared, can influence the color accuracy of a digital image.
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Re: Tiffen "Hot Mirror" filters ...
The Tiffen hot mirror works fine on my D500. On some cameras it's not needed as the lens system already has some amount of IR filtering. When IR is present it causes some tinting of sky towards purple. The filter works as a mirror by reflecting the 800 - 1100 nanometer wavelengths. This is the range that causes the problem. I wouldn't just buy one without determining if the camera really needs it. Mine may not need it in most cases but many of my pictures come from the Arctic and there's no way to do some over again. I had a real problem with a previous Casio so I didn't want to take any chances.
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Tiffen is a brand of filters not a lens.
if your sigma lens will work on 1 camera and not on the other then check the lens mount, electronic contacts, clean them if needed.
check the settings in the camera if there needs to be a change.
gently lift the mirror and check the shutter blades. Shutter failures are common on these. Also check the door switches. There is a switch with a small flipper that is closed when the battery door is fastend to the camera, and the same for the SD card door. If either of these switches is damaged the camera will not power up
The enhancing filters I've used (58, 62 and 77mm) have a pink magenta color to them. What I found was I needed to do a custom white balance with the filter in place to come out with a more pleasing enhancement. I also ran into the problem using neutral density filters giving me pink clouds, once I did a custom white balance this ended.
The filters reduce excess red tones that affect daylight film when shooting early morning or late evening. They are also effective if your flash exposures are too 'warm'. The filters I believe have a filter factor of 1.3 and require 1/3 f-stop of additional light.
I was testing the new Kenko 2x teleconverter I just got. Seems to work, but only at full zoom. But I left the epson supplied adapter ring on when I turned the camera off, and it interferred with the lens cover, and jammed it. It's a 4 leaf shutter assembly, and mine is screwed up so it won't open or close. Needless to say I'm kind of unhappy. I've heard Epson service is good, guess I'm about to find out.
If you use the adapter, take it off when you turn the camera on or off!
Get a CLA-1 lens tube. It screws into the camera body. The other end accepts 43mm accessories. Put on a 43-49mm step-up ring. Into that screw a 49mm UV filter. (The step-up ring is needed to separate the filter from the extended lens.) Leave the UV filter on at all times. Throw away the lens cap.