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Chroma Filters - Photometry - Good or Bad ?

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#1 levyjoelh

levyjoelh

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Posted 24 February 2021 - 03:35 PM

I get the impression from the AAVSO folks that they do not like the Chroma Filters for Photometry.  

 

It is not explicitly stated, but certainly implied from a recent webinar.  

 

The filters are not cheap (50 x 50) and I would appreciate the feeback from any actual users.   It appears they are available.   Everyone else is sold out.

 

Note:  Because I want to get the Ha / OII / SIII filters as well, I would like to stay in the same "family".

 

Thanks!


Edited by levyjoelh, 24 February 2021 - 03:40 PM.


#2 CPellier

CPellier

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Posted 25 February 2021 - 03:03 AM

I have not tested them (except U), but the transmission's curves are very explicit: they do not fit correctly the Johnson UBVRI profiles (old profiles, not squared, long transmission tails). So it could bring problems when attempting to transform your data.

This is quite a shame because this is an excellent brand for filters. I do have the Bessel U, and it is a dream for planetary UV imaging. 


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#3 levyjoelh

levyjoelh

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Posted 25 February 2021 - 12:03 PM

As a follow up - Any use the Andover Corporation set?




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