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)[reply]

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)[reply]

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)[reply]