I shot M45 this time last year with the Tak BRC250 and an Apogee U16M camera using Astronomik filters.
This year I used the same Tak BRC250 but this time a FLI Proline 16803 (I swapped over from Apogee to FLI) and Baader filters. Also this year I had a FLI PDF focuser (not sure if that was used in last years - it may have been).
I processed the latest version separately but also combined last years data with this years.
Of interest the latest data has way sharper stars - FWHM of as low as 1.7 arc seconds which is tight. Last years were more like 5-8 FWHM.
Perhaps that was also the focuser but I think also the Baader filters are sharper with less reflections than the Astronomik (not latest low reflection version). Perhaps also the FLI Proline is sharper although I don't know that this is the factor.
Anyway.
M45.
Latest version is
LRGB 50 60 40 40
http://upload.pbase.com/gregbradley/...87346/original
The combined version is;
LRGB 110 90 70 70
http://upload.pbase.com/image/118087554
Processing is similar although not the same.
Greg.