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Suggestions for wide angle lens (for landscape/astro/street)

Started Jun 11, 2021 | Questions thread
biza43 Forum Pro • Posts: 15,074
Re: Suggestions for wide angle lens (for landscape/astro/street)

Tim van der Leeuw wrote:

biza43 wrote:

For astro, the important thing is the light gathering ability of the lens, not so much the focal length. The X100V is a fantastic camera that is suitable for a lot of applications.

The wider the focal length, the longer you can expose without seeing the movement of the stars. Depending on the actual light gathering abilities of the lens (lower f-stop is not always a guarantee for more light) and the focal lengths you're comparing, the lens with a wider focal length but somewhat higher f-stop might win in actual light gathering ability.

At some point I downloaded a spreadsheet comparing various camera/lens combos for astro using the NPF rule that calculated actual EV numbers, and started modifying that to add my own lenses and lenses that I was considering. That gave me a table of what settings (camera, ISO, focal length, f-stop) would give me the lowest EV (lower == better in this case).

Light gathering ability from the subject:

https://clarkvision.com/articles/characteristics-of-best-cameras-and-lenses-for-nightscape-astro-photography/

Example provided: a 35mm f/1.4 lens has a light gathering ability from the subject 21x higher, compared to a 15mm f/2.8 lens.

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