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Otto Berg's Group of Optical Pieces (5)

Currency:USD Category:Collectibles / Autographs Start Price:NA Estimated At:200.00 - 400.00 USD
Otto Berg's Group of Optical Pieces (5)

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Auction Date:2022 Dec 15 @ 18:00 (UTC-5 : EST/CDT)
Location:15th Floor WeWork, Boston, Massachusetts, 02108, United States
ALS - Autograph Letter Signed
ANS - Autograph Note Signed
AQS - Autograph Quotation Signed
AMQS - Autograph Musical Quotation Signed
DS - Document Signed
FDC - First Day Cover
Inscribed - “Personalized”
ISP - Inscribed Signed Photograph
LS - Letter Signed
SP - Signed Photograph
TLS - Typed Letter Signed
Interesting group of optical material from the collection of Otto Berg, including: a "certified precision grating" mirrored optical piece by Baushch & Lomb, with label indicating "1200 grooves/mm"; a slightly larger grated mirror piece on a metal bracket baseplate, unmarked; a clear 4.5Àù diameter glass lens; a 5.5Àù diameter red glass filter; and a 5Àù diameter optical piece inset with three threaded mounting points, with tapered edges. In overall very good to fine condition.