Luv my Canon EF 24mm f/1.4L II lens EXCEPT for starscapes

Started Feb 28, 2013 | Discussions thread
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Re: Luv my Canon EF 24mm f/1.4L II lens EXCEPT for starscapes
In reply to Royce - Into the Night Photography, Aug 6, 2013

We typically advise people to avoid shooting the lens wide open when shooting star fields. While some macro lenses incorporate field flattening in the optics (for copying), the many other lenses lack the ability to provide the desired effect, especially wide-angle lenses.

When I'm shooting the Milky Way or the Orion/Bernard's Belt with my Canon 16-35mm f/2.8L II, I shoot at F4. Not only does this eliminate edge-of-field issues, but it provides tighter stars...especially if I'm doing multiple long exposures over a long period of time (tracking on AstroTrac of piggybacking on telescope) as temperature changes cause optics the expand/contract, resulting in focus shift.

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