Plan your equipment
Turn the numbers on your telescope, eyepiece, or camera into clear observing choices—with every result explained simply.
Simple answers from your equipment
Each result includes a plain-language explanation, so you do not need to know the formulas first.
Telescope setup
Practical magnification for many targets.
Approximate useful maximum: 260×See before you observe
This object fits inside the view with room around it.
Brightness and comfort
Bright view; good for nebulae and star clusters.
Uses the same telescope and eyepiece values from calculator 01.Camera planning
Take a test photo and zoom in. Modern high-resolution cameras may need an even shorter exposure.
These are practical estimates, not absolute limits. The atmosphere, optical quality and the observer's eyesight can change the result.