16-35 f4 is or Tokina 16-28 or?

Owenmorris wrote:

Thank you for your reply.

Excuse my ignorance, so when shooting night skies/stars etc.....is 2.8 absolutely the best way to go? I am assuming because more light gets in (excuse my non-technical terminology)....and therefore I could use lower ISO's and therefore have cleaner (less noisy) images. Is this correct? It might well be a consideration for me.

Thanks again.

yes, however, its a little more complicated than that.  faster is better, and some use primes, such as new sigma 20 1.4 lens. However, the unique situation is when moving objects are involved in your night skies, specifically stars.  Stars move in the sky much like the sun does (due to earths rotation).  depending on how wide you are shooting you may get away with exposures as long as 20 seconds, and still not get a "star trail" at 15-20mm.  to get proper exposure at this relatively short times, at iso 1600-3200, you do often need at least a 2.8 lens.

another option is getting and astrotacker, which you mount your camera on, and essentially it compensates for rotation of the earth.  there you have to shoot a separate shot for the non sky portion of your shot, and then blend the two.

If you are interested in shooting nightscapes with stars, and you want a zoom, you simply cant beat the tamron for quality.  if budget is an issue, both the tokina 16-28, as well as the samyang 14 2.8 are good opitons.