Bintel Astronomy Calculator & Simulator 1.3
Developed by Dylan O’Donnell

Choose Telescope

Choose Camera


*This is a randomly generated telescope and camera combination. It may be stupid. Contact Us if you need help picking your perfect telescope!

TELESCOPE: Celestron FirstScope Telescope

Focal Length (mm)

F Ratio / F Number

CAMERA: SBIG Aluma CCD 814 Cooled Monochrome CCD Camera

Pixel Size (µm)

Pixels Wide

Pixels High


Focal Length (mm)

Field of View / FOV (°)

Binning Magnifier or Reducer
Aperture 75.95mm /2.99 inches
Maximum Magnification :151.90x
Resolving Limit (Dawes): :1.5273" arcseconds
Resolving Limit (Rayleigh): :1.8170" arcseconds
Visual Magnitude Limit: : mag 12
Native Focal Length / F: 300mm / F3.95
5x Rule (Ideal Planetary F-Ratio): F18.5
7x Rule (Ideal Planetary F-Ratio): F25.8
Ideal Resolution : 0.67" - 2" arcseconds
Resolution 2.5371" arcseconds per pixel
Slight Undersampling ✅
This setup is slightly undersampled so if you look closely on your images you may find the stars blocky or surfaces lacking the potential detail. This isn't significant though and can be improved with slightly more focal length or post processing.

Camera Chip FOV 2.39° x 1.91°

Preview Targets by Relative Scale

*Note that planets apparent size is based on oppositon and will change throughout the year depending on their proximity to Earth.

Click on a telescope, camera or combination in the yellow boxes below to preview how large near and deep space objects will appear and whether the sampling is good for astrophotography. It’s easy! You can also enter in the specifications for any items that aren’t listed here.

The goal for astrophotographers is to choose a combination of telescope & camera that is neither under or oversampled. Note however that a little of either is ok and post processing can improve the end result. For example, Dither & Drizzle improves undersampling. Noise reduction & sharpening improves oversampling.

Need help? Just ask us! 


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