Using RVB Photometric Filters for DSO Imaging?

[Mr Ian David Sharp]

I’m sure this is an oft-asked question but is it ok to replace regular R,G and B filters for R, V and B filters of the photometric variety? (in this case Baader Bessel filters)

I ask because I have the age-old problem of space in my filter wheel. I have a 7-pos FW and currently have L,R,G,B,Ha,OIII,SII fitted. I need to fit RGV filters so thought this might be the way to go. It’ll be in a C11 Edge HD system and I still want to image galaxies and planetary nebulae etc.

Thanks
Ian.

[Mr Ian David Sharp]

Hi all,

There has been quite a healthy discussion on this in the AAVSO forums and it seems that the answer is yes – there should be no problems doing this.

I’d still be interested in any experiences on this.

Cheers
Ian.

[Dr Paul Leyland]

On my last trip to La Palma I took some images in Sloan i’, r’ and Johnson V (I don’t have any other JC filters nor Sloan g’) of the M67 Landolt field. The primary interest is photometry calibration but I also realised that tri-colour images should be possible, even though they may look odd.

The images have not yet been processed but I will report back later.

Paul

[Eric Watkins]

I once had a go at imaging M51 using clear,g’ and r’ sloan filters. A friend, Mark Large processed a small number of frames using Pixinsight.
clear 10 x 50sec. r’sloan 20 sec x 50 sec and g’sloan 20 x 50 sec.

See the result on my BAA web page

https://britastro.org/observations/observation.php?id=20170821_004500_f3b880f4b6792db7

Eric

[Mr Ian David Sharp]

Thanks Eric and Paul,

With the amazing Photometric and Spectrophotometric colour calibration processes in PixInsight these days I’m pretty sure it will all work out fine.

Cheers
Ian.

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