Hi, I am using AAVSOnet to monitor several variable stars. I receive images from MPO61u and OC61 which have filter sets B,V,R,SI and B,V,SR,SI respectively. I use Vphot for the analysis and all available comparison stars in the field of view have magnitudes available in B,V,R,I bands. So I am not able to determine magnitudes in SR- and SI-band. Any advice on how to solve this? For example, can I request SR- and SI-magnitudes for these reference stars using CHET?
Thanks!
Roel