Quote:
Originally Posted by Wavytone
While 170X is possible it’s rather more than 2x per mm which is really the practical upper limit for refractors and TBH 170x is hype.
I could push my 70mm to 300X with a 1.6mm eyepiece, but there’s no point.
Can’t beat the physics of diffraction.
FWIW APM have a large selection of small APOs available from 50mm up, and assorted focal ratios, some clearly aimed at imaging while others are dual visual/imaging, the difference being the backfocus and focusser travel. Another aspect for imagers concerns all-screwed adapter rings to connect a camera - far more precise and secure than a cheap slip-fit 2” adapter. Add to that availability of 2.5” or 3” focussers including tack & pinion types able to lift heavy loads securely.
|
Really high mags like that Wavy , truly are only useable when splitting bright and mostly equal Double Stars ; and rarely even on the Moon in excellent seeing... so much of it is hype indeed, and useable on only a handfull of nights per year for most of us.
Still it will be a handy little scope for many, many uses.
bigjoe