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6" Littrow Lens Set, Unfinished, UPDATED Sold!

Price - $150.00

Ad Number: 129537

Posted: 20 Feb 2018

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6" Littrow set
Crown element R1=R2 finished, polished.
Flint element R3 is semipolished, R4 (flat) is fine Ground.

updated measurements

R1=R2= 46.89" Thickness ctr. .590
R3= 45.35" Thickness ctr .292
R4= flat

Most Littrows are BK7/F2 most are R1=R2=R3

In OSLO this design shows f/19. If finished with the current radii, the performance is excellent, .07 waves p/v. I do not know why R3 is different, I doubt it's my measurements, but if you matched R3 to R1,2, the performance is even better, .04 p-v. This message format won't allow upload of graphic spot and wavefront displays, so contact me if you want to see these in a regular email communication.

Buyer pays shipping, Paypal preferred.


  • Condition unfinished
  • Location 04353

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