Thursday, February 26, 2015

Wide fields

As I mentioned in http://astrojolo.blogspot.com/2015/02/new-telescope-first-light.html my new scope has piggybacked camera lens, so I can try to picture some wide field starfields during imaging sessions. Currently regular, H alpha blind 1100D camera is attached, but in near future I will make full spectrum mod to my 450D camera and this one will be used for piggyback imaging.
So far two pictures only:
Orion belt (at right) and some nebulaes: M42, Horsehead, Flame nebula
Gemini constellation, nearby Tejat Posterior star (at left). Monkey Head nebula (bottom) and M35 cluster (top)

Tuesday, February 24, 2015

New telescope first light

My old 6 inches newtonian served me well for over two years, but finally I managed to complete building of the new 8 inches fast f/4 newtonian. I have made carbon fibre tube by myself and then equipped it with all necessary devices - mirrors, mirror cell, spider, focuser, dovetail, astrobox (with USB hub and focuser controller) and others.
Main 8 inches f/4 mirror in the cell and aperture mask
Focuser and Arduino based astrobox controller during final tests 
Telescope top view with both cameras and filter wheel attached. 
Piggybacked lens for simultaneous wide field imaging.
In the field, before first light.
First light - M1 Crab nebula. Still needs some adjustments in collimation, but looks promising :)

Monday, February 9, 2015

Colors of the Moon


Moon is not as colorless as you can suspect. When you take good quality picture moon with color camera you can postprocess the frame to saturate the colors. Then you will notice some colors of our not-gray-anymore satellite. There are two dominant hues. Red/yellow indicates iron related content, like iron oxide FeO for example. Another color occurs in darker regions with lower reflectance. It is related to titanium presence, and this component shifts the color of the mares from red to blue.

Clear skies!