 |
| Deep Sky objects at Cygnus Constellation and some "air glow" not Aurora. |
Nikon D610 + EQ-3 Sysncan mount
When humidity levels are too high after a thunderstorm, dew forming on the main objective of the scope is a major problem of any astro -imager. And that is what exactly happened on my imaging session one night at Saskatchewans Cypress Hills Inter-provincial Park. So i have to pack up the scope and use a normal DSLR lens instead, mounted on a tracking mount i was still able to take pictures of the sky on a wider view. The Nikkor 85mm f1.8 lens proved to be an excellent astro lens. Corner sharpness are excellent even wide open and coma is very negligible. When used on a tracking mount, f1.8 is even too much. I had to stop down to f2.8 to avoid over exposure, or just adjust the ISO but sometimes i can be lazy. =D
No comments:
Post a Comment