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32mm - Milky Way at f/1.4 tonight (PICS)

Started Sep 27, 2018 | Discussions thread
bmike
bmike Senior Member • Posts: 2,644
Re: 32mm - Milky Way at f/1.4 tonight (PICS)
1

For anyone interested in the 32 or 22 for astro / low light (I have used the 22 for Milky Way and night shots, then adapted a Sigma 35 before moving to a full frame camera - but the 32 1.4 was on my radar)

The 32 f/1.4 has a physical aperture of 22.86mm.

This is an area of 410.12 sq. mm (3.14 * (22.86/2)^2 = 410.12)

The 22 f/2 has a physical aperture of 11mm (22mm / 2 = 11mm)

This is an area of 94.98 sq. mm (3.14 * (11/2)^2 = 94.95)

The 32 lnearly 4.3x the light of the 22 hit the sensor in the same exposure time (410.12 / 94.98 = 4.3)

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