IR-pass filter for planetary imaging

[RafalT73]

Hi, have anybody heard about IR-pass filter in 36 mm unmounted size? I have already found IR-pass filters in different sizes but unfortunately no one fit to my ATIK filter wheel 36 mm.

 

[riklaunim]

Astronomik or Baader may have it in their catalogues (but not widely shipped to shops) and if not - custom size filters are an option like from UQG: http://uqgoptics.com/catalogue/Filters/SCHOTT_LONGPASS_FILTERS.aspx

[RafalT73]

I have found 36 mm ProPlanet filters at Astronomic webpage, but it doesn't look like unmountet type. I will explore link you posted. By the way, did you use this kind of filters for planetary imaging?  Looks promising in case of seeing improvement. 

http://www.astronomik.com/en/photographic-filters/proplanet-742-filter/astronomik-proplanet-742-ir-o36mm-ungefasst.html

 

[RafalT73]

5 hours ago, RafalT73 said:

I have found 36 mm ProPlanet filters at Astronomic webpage, but it doesn't look like unmountet type. I will explore link you posted. By the way, did you use this kind of filters for planetary imaging?  Looks promising in case of seeing improvement. 

http://www.astronomik.com/en/photographic-filters/proplanet-742-filter/astronomik-proplanet-742-ir-o36mm-ungefasst.html

 

I am quoting myself because I have already found technical specification of ProPlanet IR-pass filter and even if it does not looks unmounted but in fact it is . Only a question I have, does anybody use it? What is your opinion?

[riklaunim]

ProPlanet 742 works on the Moon, can sometimes show some detail on Venus (deeper filter better), with good camera also on Jupiter or even Saturn. Now I use much wider Wratten/Schott filters and those work better in most cases.

[RafalT73]

Thanks, soon I will see - I have already ordered ProPlanet 742 filter especially for Moon and Jupiter imaging. I hope it will also give me a good results as Luminance filter for Jupiter in RGB techniques. Riklaunim can you post some planet or Moon images done with and without IR-pass filters? 

[riklaunim]

The more infraredish the filter is the more pink/bright coloured IR-RGB Jupiter will be

 

RGB vs ProPlanet-RGB (old photos):

 

And other:

 

If you want more filters you can ask UQG how much they would want for 36mm diameter filters. 50x50 square is 26 GBP.

 

[RafalT73]

Many thanks for sharing. Differences are definitely visible! By the way what is YRGB?  Did the images taken at the same seeing condition (same time)?

[riklaunim]

Those side-by-side are captured at the same time: L, R, G, B, Y, RedLum where Y is visual yellow, redLum is visual red (those visual filters pass infrared and part of visible spectrum). In some photos I also used visual orange. Without dispersion corrector L, yellow and for low targets even orange won't work efficiently as dispersion will blur the image.