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Model: ak_pp_642-bp_125Part Number: 10227125
"BP" are short for "Bandpass": The filter gives you a 200nm spectral window from 642nm to 842nm. Contrary to the other two ProPlanet filters it blocks the longer infrared. Together with the Astronomik ProPlanet 742 and the ProPlanet 807 you can now have three choices to match your needs when imaging in the IR. The Astronomik ProPlanet 642 BP will be the right choice for the best image quite often!
Three Filters in One!
Depending on your camera, the Astronomik ProPlanet 642 BP is a great tool either for daylight IR-imaging with your digital camera, or it will reduce seeing effects and enhance contrast when used for lunar- and planetary imaging, and third it will be a very good and low-priced H-alpha Filter for getting started in Deep-Sky Astrophotography of H-alpha regions. Daylight IR-imaging
Short exposure times, about the same as normal VIS-imaging
Perfect choice for Infrared-Videos
High-resolution Lunar and planetary imaging
Short exposure times
Effective reduction of Seeing
No ghosts and best sharpness due to blocking the longer IR
Deep-Sky Astrophotography of HII regions
Best transmission of the H-alpha line at 656nm
About 40nm FWHM with astro-modified DSLRs
Amazing contrast under light polluted skies or moonlight
Low priced filter for getting started in H-alpha imaging
Easy focussing using camera display plus LiveView!
Guiding for Astrophotography
installing the 642BP in front of your guiding camera dramatically improves guiding quality, as image-motion from one frame to the next is minimised.
The major emission lines of artificial light pollution:| Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm || Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm |The major emission lines of nebulas:H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm
I purchased this to complete the set for use with an ATIK 383L+ and a EFW2 filterwheel. The complete set is Baader-C, Baader-R, Baader-G, Baader-B, Baader-L, ProPlanet-642, ProPlanet-807, Staranalyser-100, and a solid blank for darks. This gives me two different sets across the 400nm to 1000nm window, i.e. Penta-colour (R, G, B, 642, 807) and Tri-colour (L, 642, 807). The Atik 383L+ is sensitive between around 300nm and 1050nm. At the IR end there is a massive atmospheric absorption spike around 1100nm so there is no point going past there. Between them these filters chop the range that most CCD sensors can cover into usable chunks. I might now look for a low pass filter stopping at 400nm to replace the Baader-C, although it is useful to have a wide filter for focusing and target alignment. Perhaps I don't need the blank for darks perminantly fitted, the camera does have a darks shutter.
I've been using it only once until now. I captured Saturn via a SC 9.25 XLT telescope with 2,5 x Barlow lens and Zwo ASI camera. The quality of the final image become essentially better than without this filter, in spite of the fact that the max altitude of the planet is ab. 6 degrees here in the Middle Finland now. So, highly recommended !
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