Using Fuji lenses for astrophotography

Started 2 months ago | Discussions thread
biza43 Forum Pro • Posts: 11,727
Re: Using Fuji lenses for astrophotography

Montanawildlives wrote:

The problem with using long focal lengths in astro photography though is that the star movements will blur quicker at longer focal lengths than wide focal lengths. So while you may be letting in more light, you will have blurry, messy looking stars.

At the same shutter speed, yes, ok.

Enter stacking - take many shots and stack them after. You will get much better results with stacking anyway.

Generally, the rule for "sharp" non blurry stars is exposure time = 500/focal length. Luckily here, there is no exponential function, so doubling focal length only halves the amount of exposure time for sharp stars (see Star trackers to avoid this).

OK

Again stacking is fine, tracked, or untracked.

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