Quote:
Originally Posted by postcardcv
...... Without the mod the flash will output IR and visable light and the filter on your camera will block the viable light leaving only IR to be recorded by the camera. I'm struggling to see the advantage of adding an IR filter to the flash, but that's probably just me being slow.
As an aside I decided to order a screw in IR filter to give it a proper go, they are relatively inexpensive so will give me a way to try it out before spending out on a conversion.
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Not at all Peter, your statement sounds quite logical.
Pure instinct told me the result would be different though hence adding a filter. That is probably based on the fact that I know that years ago Nikon sold a IR/UV specific flash plus the relavent filters. In fact Andy posted a link in post no. 54 to that particular bit of kit. Nobody is going to make specialist kit like that unless there is a requirement based on experiences.
Just to confirm my instinct was correct I took a pic without the filter to compare later while I was at it.
Attached is a side by side screen grab of each Nef with it histogram. It is fairly large 1122 x 764 to give a reasonable view. Exposure on both is identical. White balance was custom, and taken from grass in sunlight. The difference I think you will agree is quite significant, hence I am going to do a job on my three portable flashguns.
As you are going to give it a go, and myself not being familiar with Canon lenses, does the lens you hope to use have an infrared focusing mark. I mention that, as with most lenses infrared focusses in front of the normal light distance. So it is a case of focus then manually refocus on the IR mark.
I will do a pic of one of my lenses to explain that.
Don