The acronym CA300 stands for carbon astrograph 300mm. It is a homemade Newton telescope dedicated for astrophotography.
Initially it was built to operate with my full-frame SBIG-STL11k and a 3″ Wynne Corrector. On an old Vixen Atlux mount, it was a mobile scope. Finally the scope has been retired and after some years it came back with the purchase of a Skywacher EQ8 mount which now resides in my backyard.
|Diagonal Mirror||120mm (40%)|
|Focal lenght||1200mm (F/4)|
|Mirror||Orion UK Ultra Grade|
Strehl = 0.993
|Corrector||ASA 3KORRW 3″ Wynne Corrector 0.95x,|
|Focuser||DIY ASCOM Focuser Pro v1|
|Tube||Carbon sandwich, homemade. Mount without tube rings|
|Thermal control||8 Point diagonal heater 2W, 3 Fans 50mm|
Backyard Astrophotography Soft-/Hardware Chart (left)
In the field I use my NON200 Telescope. Structure, Diagonal and OAZ are from a Lacerta 200/1000 Newton. Mirror was replaced with a GSO 200/1000mm.
It is an extremly fast Newton telescope, optimized for photographic use. BA200 is a acronym for “Boren-Simon Astrograph 200mm”, because it has the same optical system design as the famos commercial 8″ Boren-Simon Newton. The primary goal was to built a scope for narrowband imaging. My dream was to finish an object per night. The telescope is normally used with my Moravian G2-8300 CCD camera. First light was in June 2012 shooting M13.
After initial difficulties this scope has been a great success. At this point I have decided to let it imaging unattended in my garden. During the night, temperature drift was not a problem, but filter change required refocusing and I had to get up from bed. A motorfocus and autofocus stands on my wishlist. I tried Robert Browns myFocuserPro and this was the begin of a great DIY success story. Today, all of my three photographic newton telescopes have this motorfocus. Robert Browns design and software works stable and reliable and it is very well documentated.
|Primary Mirror||GSO 200mm f/4|
|Secondary Mirror||Orion UK 75mm diagonal|
|Focuser||Feather Touch FTF2008BCR|
|Reducer||ASA 2″Korr 0,73x|
|Messured focal length with corrector||618mm (f/2.9)|
|Carbon Sandwich Tube||Klaus Helmerichs|
|Motorfocus||Robert Brown: myFocuserPro v1|
|Misc.||Integrated secondary mirror heater|
low profile vixen style rail, no tube rings
Skywatcher Esprit 100
The Skywatcher Esprit 100 is a triplet apo suitable for full frame cameras. It was my new optic for the SBIG STL11000 and my Canon 6D and finally the sucessor of the Pentax75. It came with a complete package: finderscope, tube rings, all adapters for photography like an M48 adapter, Canon M48 ring and a special designed field flattner. Unlike the FSQ106 the temperature drift nearly close to none. The first light was in May 2014 imaging the antares region. Many images made with this scope are in my STL11000 gallery. In October 2019 a myFocuserPro2 was added to the scope.
Special purpose telescopes
Lunt Ls60T Ha B1200 CPT
TMB Refractor is mainly used for solar observing and the moon
a special scope for moon and planets
ZWO ASI183MM with EFW7, TS 9mm Off-Axis Guider, GPU coma corrector. Filterwheel has 36mm Baader filters (LRGB,Ha, SII, OIII)
Moravian Instruments G2-8300, EFW-2S-10, Moravian OAG, QHY Guidecam. Photo made at Kiripotiop Namibia
SBIG STL11000M C2 full frame interline CCD camera. I never wanted such a big thing, but there was a good chance to purchase a used one in June 2008.