The filter transmission as measured by Rodrigo for the B, V, VE1 and VE2 filter up to 800 nm and the IRCUT filter for a much wider range as given by the manufacturer.
Colour filters
Optical design Posted on Dec 27, 2011 14:52- Comments(2) https://earthshine.thejll.com/?p=323
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We chose VE1 as well as IRCUT even though they are quite similar so that nobody could say ‘oh, well, you did not use the same filter as BBSO’ – a sort of insurance policy! 🙂 The IRCUT filter is the exact same as BBSO uses.
Thanks Henriette, that’s very useful. VE2 is very similar to I band — that explains the photometric results on the open cluster M41 perfectly. VE1 and IRCUT don’t seem to be very different. Do you know why we have both – is there a major difference which is not obvious from these tracings? The good correlation of VE1 with V is also makes sense, as it brackets it by about the same amount on each side.