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Edmund Scientific 1.25" 20x eyepieces lot of 2 in original box

Auction No.:
12420
Current Bid:
$11.00
High Bidder:
Chris Aschoff
Bid History:
1 Bid [View History]
Location:
Spokane Vly, WA - United States
Started:
06/12/2018 22:51:PM
Ends:
06/19/2018 22:51:PM
Shipping:
Buyer pays shipping
Payment:
PayPal, Personal or Cashier's Check, Money Orders
Hits:
118

These eyepieces are a bit of a mystery to me and I'm finally letting them out of my collection of vintage oculars.

These are labeled as 20x models, but I highly doubt they have anything to do with microscopes because those are usually .921" barrels. These clearly and perfectly fit into any 1.25" focuser, diagonal, or barrel. This is where they become interesting...

The ocular arrangement is illustrated by me in the last photo and does not follow a major ocular design. It is a 4-element with the front-facing lens a single unit, and the remaining three cemented together. The field of view given is very wide, over 60-degrees. Eye relief is tight, however, like an old konig. It seems to act a lot like a 16mm UO Konig, but those have more elements than does this.

The ocular bodies are made of solid machined aluminum.

The unusual property of these is their innability to work in reflectors or small maks. The C90, C4.5, Meade 6 and 8 reflectors and the Astroscan reject these; they will not come to focus. Only in refractors with very long drawtubes, like the Jason 313 Discoverer, Towa 339, Sears 76, Tasco TE-10, and Unitron 142, will they work. I have not tried them in binocular telescopes, which are usually in the f/4.5 to f/6 range.

Cosmetics are very excellent, almost perfect mint on the eyepieces and box. Optics have some coating wear and deep dust, but not heavy dust. 

These are pre-1985 Edmund oculars, and so even though they come with their original MPN sticker on the box, there is virtually no information I can find on them. Would you like to solve some of the mysteries around them?

All nations welcome to bid.

Time Placed User Bid Amount
June 18, 2018 04:11:10 AM Chris Aschoff $11.00