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Optical Glass Filters
Al Luebbers, our founder, collected glass. Not glass like you'd find on a knick-knack shelf, but optical glass. Lenses, prisms, reticles and filters, for example. Focus on the filters. Many of his filters came out of military surplus, and this is for-real stuff. We mean many are solid dyed optical glass, ground and polished to flatness standards that were probably excessive. Others are from the old days in photographic optics, and their standards were even tighter than your militaristic Uncle's. We've found that photographers, artists, and optical designers still have an occasional need for good glass filters, so we're making a list of some goodies. As always, don't be timid about calling for quotes on quantities. If we have 'em, we'll sell 'em. Just don't sell them back. Please! If you're just playing, the assortment set may be a better way to go. Can't decide?? New to filters?? Doing a science project on light?? Let us assort (6) different filters of at least 20mm. dia for you.
| DIAM.or SIZE (mm) | CENTER THICK (mm) | |||
|---|---|---|---|---|
 |
3477 FILTER, AMBER | 26 | 1.5 | |
|
3492 FILTER, AMBER | 30 | 2.3 | |
|
3480 FILTER, NEUTRAL | 26 | 1.5 | |
|
3490 FILTER, NEUTRAL | 30 | 2.3 | |
|
3510 FILTER, NEUTRAL | 50x54 | 3.1 | |
|
3512 FILTER, NEUTRAL | 67x70 | 4.1 | |
|
3458 FILTER, RED | 6 | 1.4 | |
|
3464 FILTER, TYPE A | 9 | 1.8 | |
|
3470 FILTER, YELLOW | 18x18 | 1.6 | |
|
3504 FILTER, YELLOW | 37 | 5.5 |
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