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Lens-Telescope adapter (Help identify this equipment?)
I wasn't very precise in my first comment.
My adapters are from 4 manufacturers/distributors, including Vivitar. These are definitely all 5x. Bought my first one some 30 years ago, so they've been around a long time. My statement on 80-210 & 300mm mirror lenses was a useability comment, not an optical judgement. My primary interest for these telescopes is for a light, small, high-quality, telescope for wildlife & maritime stuff, 'tho I used to be a pretty serious aircraft anorak... I've tried the adapters with many lenses. It's helpful to have zoom -- makes target-finding quicker. Short lenses below 75mm don't work as well. You don't need automatic, autofocus or anything that adds costs or complexity. Least moving parts the better -- telescope image is limited by the quality of your eye, not film resolution (unless you're trying to be very clever, & use this adapter to produce images to be photographed ) Little use with my 120-600 Vivitar unless on a rock-solid tripod base (which I do have as a permanent fixture, as I overlook an interesting waterway). Problem with really long lenses is that the adapter makes them much longer! Firld of view becomes a degree or so, & locating what you are trying to see can be tiresome without a finder -- some wildlife is very small -- & fast ..... Hand-holding a 3000mm lens is an art form destroyed for me by 60 years of beer drinking. Some camera accessory folk do (did?) sell detachable tripod collars, usually some form of clip-on collar that surrounds the lens barrel. Must confess that on my adapter set of ancient cast-off lenses I've used crude rigs including jubilee clips 'thru to aralding a suitable nut straight onto the lens barrel. Easy to make somthing up, either permanently or temporarily. Often see old lenses on eBay for a few pounds with tripod mounts. The best optical quality lens I've used with an adapter for everyday usage in the field is a '60's 200mm f3.5 prime pre-set by Asahi Pentax. Mine has tripod mount, light in weight & image, wonderful quality -- but mint, & has sentimental family connections, so not used in the hurly-burly of cliff walking etc. Must find a battered one ..... Adapters get called different things. No universal name. Quite often on eBay -- I've bought 3 there, between $30 & $50 each. (All new, or as new).. Nothing to go wrong with them, so a safe buy. |
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