Talk:Dawes' limit

The third equation on this page appears to be wrong. The first two equations give results consistent with other references. The third one R = 0.1384/D D in meters, R in radians does not.

By my calculations fo D in metres and R in radians, R = 5.61530598x10^-7 / D

Regards,

Al Sheehan.

Deleted the formula for meters/radians per observation above (but by my calculation the factor would be 0.005624). I do not recall where the formula originally came from, or maybe I did the unit conversions incorrectly.

Brianhe 03:53, 24 October 2006 (UTC)

Examples

It would be nice to see some pictures, examples, and a rough idea of what interesting targets are at those limits. Doing nebulas doesn't seem to need these unless you are doing a high-res mosaic? Thanks! Hansschulze (talk) 01:27, 2 February 2021 (UTC)

If someone wants to take this on, you could use the double and multiple star showpieces table on page 12– of Cambridge Double Star Atlas by Wil Tirion as a guide.

Hansschulze, there are other reasons aperture is desirable. For example, all things being equal, greater aperture gives greater signal-to-noise ratio for the imager. You'd also be less subject to tracking error/blurring because shorter exposure times are required. ☆ Bri (talk) 04:53, 2 February 2021 (UTC)