Originally posted by UserAccessDenied Any suggestion on a lens to use?
That's a good question and one many of us face. I understand the faster the better, as long as IQ is maintained.
If you are using astrotracer, slower is an option as you take one long exposure for the foreground without tracer and then multiple traced images and use the first as the mask (in Sequator).,
Shorter focal lengths give the option of longer exposures without astrotracer (xx/300) = seconds and if fast and short, well that nails it first time?
The DA15 is too slow and poor in the corners I think.
The DA70 is a PF monster for stars wide open.
I can't speak for the other lenses.
I am considering a Sigma 17-50 f2.8 for the versatility beyond astro, rather than get a single purpose dedicated lens.
---------- Post added 06-09-18 at 02:15 PM ----------
I should add, the new DA* 11-18 F2.8 has astro written all over it if you can wait