Quote:
Originally Posted by Atmos
The lens does also help, to explain.
My first 85mm was a Nikkor 85mm F/1.8G, one of my first tests with it was some time on the Crux region. Ended up just ditching all of the data as the amount of CA was unusable even at F/5.6. It wasn't overly sharp with my D7200 so the colour rendition was non-existent , stars were soft and surrounded by purple halos.
It wasn't so bad for daytime use but for astro, I ditched most of what I took with it as it just wasn't well corrected, especially in coma as well.
Logan is correct though in that even a cheap tracking mount will help. I do a lot of wide field stuff with a 10 year old HEQ5 with stepper motors. An expensive mount with a poorly corrected lens will do better than a non tracking mount due to longer exposures. It also isn't about expensive lens'. My dirt cheap 50mm F1.8D at F/4 slaughters the 5x more expensive 85mm F/1.8G at any aperture.
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The Tamron is an excellent match for my Sony Alpha a58 and the tracking mount is on the wish list. I realize that a Robber Fly in my garden can't be equated straight across to astrophotography but it does seem to work nicely so far
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