> HOW TO IMPROVE OUR POLAR ALIGN ACCURACY
To check the polar alignment of your telescope look trough the polar scope. When turning the Ra axis the polar star should move in the exact circle in the eyepiece without any deviation. From the Go To control panel, you can check the polar accuracy after alining the telescope by going to align – > display polar alignment. The deviation should be not more then a few minutes. You can use the menu option to correct the alignment. The telescope will point a star and then you will have to center it in the field of view by moving only the azimuth and altitude axis.
So in short : align -> polar align, you can use the the procedure for precise polar alignment. The telescope will first point the last object in the field. You will need to center it with the controls. Then the scope will point again and you will need to center the object again but this time using the azimuth and latitude axises of the head. when done the RA mount axises will point at the celestial pole and star trails during long exposures will be reduced.
Good alignment is critical for long exposure photography. Good luck!
Recently I got one very good lens the Asahi Takumar 135mm 1:2.5. This is fast telephoto lens and from my point of view a good lens should be with aperture from 1:1,2 to 1:2,8.
Moon at 45% illumination and 70x magnification. With aperture of 200mm,14,1 stops dynamic range, color depth of 23.7 bits at this image there are slight color variation on the moon surface that reveals it’s structure.
This is the beginning of my research on how dark the sky could be and what is benefit of a dark sky for astrophotography. I was inspired from those 2 sites. First one presents mathematical model of how dark the sky is.
You can find my last DSLR Astrophotography article in Bulgarian at page 76. I am sharing my last findings for this publication, Specially written for the Institute of Astronomy.
Satellites, cosmic trash or UFOs, the moving spots are everywhere on the sky. Typical satellite behavior is to reflect sun light. It should be yellow or white and could fade and shine due to its rotation.