Note! The exposure portion of this simulator currently does NOT work with Internet Explorer! Please use Chrome or Firefox instead.

This tool attempts to simulate the astrophotography triad (telescope aperture, focal length and image resolution), very similar to the well-known photography triad (exposure, aperture and sensitivity).
Sliders' spacing is set to √2 in order to simulate a stop-based arithmetic like the one used in photography.
This page has been adapted from Tim Andersen's exposure simulator (with the author's permission).

Assumptions:
Total exposure is fixed to an arbitrary duration.
Camera's square sensor has a fixed linear size (14.3mm) and a base resolution of 3800x3800 pixels measuring 3.76um (pixel size of the widespread IMX571 and IMX533 Sony CMOS sensors).
The third slider allow to simulate a bigger pixel size, with BIN2 and (close to) BIN3 operating modes.
Please note that BIN modes for OSC cameras has some quirks to be aware of (Bayer pattern). Thus, it's better to think about BIN modes in terms of monochromatic shooting.

A camera meter is located above the simulated picture and will tell you whether the current exposure is underexposed or overexposed by up to three stops, or more if the arrow begins to blink.