I can send photometric measurements if I don’t use photometric filters?.
Thank you
Hi Victor. Yes you can. Are you using any filter at all (like R,G, or B) or just not photometric filters (like B, V, Rc, and Ic)?
-Walt
Thanks for replying.
I don’t use any filters, and my camera is monochrome.
Later, once I’ve mastered photometric techniques, I’ll buy a filter.
Regards.
The AAVSO Guide to CCD/CMOS Photometry has the following to say about photometry with no filter:
“… there are several cases where unfiltered observations are useful: when the source is known to have a neutral color (where all wavelengths are equally bright, as is typical in hotter objects like cataclysmic variables in outburst), when the object is very faint and simply detecting the source has great value (as in gamma ray bursts), or where timing or period determination is the overriding scientific goal (as with eclipsing binary stars). In fact, clear filters are commonly used for situations where temporal variation is of primary interest and where targets are so faint that any loss of flux through standard filters is unacceptable.”
There will of course be other situations (e.g., photometry of very red stars) where unfiltered photometry may not yield accurate results, particularly if the response of your unfiltered sensor is quite different from its response when used with scientific filters.
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Indeed, I do a lot of unfiltered work. It is specifically for one of those cases – time series of cataclysmic variables where the goal is maximum cadence and maximum S/N to be able to see time resolution. Not knowing your system or your interests Victor, maybe it makes most sense to do some practicing of photometry techniques without a filter for a while and then consider getting a V filter.
-Walt
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I use mono camera just for eclipses timing and send data as CV or CR. Using of clear sensor helps to decrease exposures - it is important for old mount without guiding!
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