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Message: <blockquote data-quote="billb9430" data-source="post: 3584553" data-attributes="member: 98032">Another type of reflex sight - the NydarI like red dot reflex sights for nighttime astronomy use, but use another reflex sight that needs no batteries with my spotting scope in daytime. It is the Nydar Shotgun Sight. It uses a little prism with ambient light to illuminate the white bullseye reticle. These were first marketed in 1947 for aiming shotguns, but have been discontinued for many years. They do appear regularly on Ebay, however. If you check, you'll find some with asking prices over $300, but these rarely sell. With patience, you should be able to find one for $10 - $40 plus shipping. Check photos supplied or ask the seller before buying to be sure the front window is still in good condition, since these are old sights.I'll attach four photos showing how I modified mine to use with the Nikon ED50A. I also use one with a Pentax PF100ED on a larger tripod and find it adequate for aiming the scope even on rare occasions when I use the scope at 90x or more.  - Bill</blockquote>