Originally from an overhead projector, this is a
Cooke triplet which makes an inexpensive telescope
objective. 4" OD barrel, coffee can lids make the
perfect lens cap. 3.75" clear aperture, coated,
very good condition.
Paypal is the preferred method of payment. Address
must be confirmed if using Paypal. Postal money
order also acceptable. Price includes shipping
in the lower 48 states. Other reasonable offers
considered. Thanks for looking.