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then polished flat on both sides to a quarter wavelength to ensure maximum image sharpness and distortion over the entire filter
and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i
Travel Scope™ 70 DX includes two eyepieces (20mm and 10mm)
Shooting Meteor Showers
Askar 50P Finderscope then polished flat on bothA portable, versatile 50mm quadruplet APO astrograph Askar's petite new 50P Petzval optic provides sharp images with APS C and smaller cameras, providing wide angle views and fast, f 3. 8 imaging. With its 190mm focal length, you'll get a roughly 7 field across the long side of APS C cameras, and a still wide 3. 4 with the popular ASI585 cameras This is a great choice for beginners: The 50P's light weight makes it ideal for use on small tracking
