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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) | |||
|---|---|---|---|---|
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3477 FILTER, AMBER | 26 | 1.5 | |
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3492 FILTER, AMBER | 30 | 2.3 | |
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3480 FILTER, NEUTRAL | 26 | 1.5 | |
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3490 FILTER, NEUTRAL | 30 | 2.3 | |
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3510 FILTER, NEUTRAL | 50x54 | 3.1 | |
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3512 FILTER, NEUTRAL | 67x70 | 4.1 | |
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3458 FILTER, RED | 6 | 1.4 | |
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3464 FILTER, TYPE A | 9 | 1.8 | |
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3470 FILTER, YELLOW | 18x18 | 1.6 | |
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3504 FILTER, YELLOW | 37 | 5.5 |
Off Square
Check out this standard mirror that reverses to a first-surface mirror covered by a piece of protective film. The first-surface side is great for use with lasers. It's 1/8" thick and 8" long. And? And it tapers from 5-1/4" wide at one end to 5" at the other. If anyone asks, just tell him he's hallucinating.
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68678 FS MIRROR |
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Closeup
Designed for watchmakers, this aluminum loupe with a 1" dia, 10x glass lens snugs to your eye, but leaves your hands free, thanks to the flexible 15" headband that encircles your head. It has a 1-1/2" working distance, and would come in handy, too, if you poke around in needlepoint or manipulate anything miniature.
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91792 HEAD BAND LOUPE |
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Heat Filter
A little pricey for a 2" x 2" x 1/8" thick piece of clear glass, until you figure that this is pretty darned talented glass, and that it filters heat and reflects infrared and ultraviolet rays. Then it's a bargain!
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34410 HEAT FILTER |
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Magnif Lamp
Magnificent magnifier lamp! Great for hobby work, stamp or coin collecting, needlepoint, sewing and crafts, even reading if your eyes are "mature". The plastic "head" assembly has a 3.5" dia, 3 diopter magnifying lens and a socket with switch for an incandescent lamp (60 Watt max.) This is mounted on the end of an arm the other end of which clamps to the table top. The arm has (2) roughly 15" long sections and swivels at the clamp to allow precise positioning over your work. Plugs into any wall socket. Basic black or white, it is a brand new good quality item that you will find so useful you will wonder how you got along without it!
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89418 DESK MAGNIFYING LAMP |
Sun Scope
We haven't had this much excitement around here since the first shipment of burp guns arrived! The Solarscope is here, and everyone's lined up to look into it! This solar viewing device lets you indirectly watch sun spots, solar eclipses, even clouds drifting across your line of sight. Using it, you can determine the changing times of solar noon, the sun's rotation rate, the earth's pole axis inclination, your latitude and more. The adjustable corrugated-cardboard framework holds a first-surface mirror, and a Cx lens in an 8-1/2" long tube, which reflect the sun on a white panel of the frame. On sunny days, it can be used outside, or inside through a window that faces south (or north, if you drag it down to Argentina or Australia). Simple to assemble, and to disassemble for storage between solar viewings. It's 14-1/2" x 16-1/4" x 24" high OA, and comes with a 38-page teacher's guide. It's made and sold in France by Light Tec Optical Instruments, and we're one of the few Solarscope sources in this country.
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92356 SOLARSCOPE |
Digital Light Meter
This Velleman DVM 1300 Light Meter displays measurements between 0.1 and 50K lux in (5) different ranges on a liquid crystal display with (4) 1/2" high digits. Filtered 1-1/2" dia sensor on a 13" coiled cord. The 4-5/8" x 2-3/8" x 7/8" case has reflective tape on the back for dealing with a shadow. Comes in a vinyl case with a recommended-illumination chart and a 12-volt battery.
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92715 LIGHT METER |
Monitor Mirror
It doesn't say that on the box, but that's what we're using it for around here because we're tired of surprises. It's a slightly convex 2-3/8" x 2" plastic mirror with a ball-and-socket joint (4-1/8" tall OA) with a self-adhesive strip to mount it where you can see people who have no business sneaking up on you in the first place, OK? Includes a little clip on the back to hold notes.
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37074 MOUNTED MIRROR |
Lighted Loupe
For when you need things big and bright. The acrylic-lensed eye loupe has an adjustable white LED attached to the side, powered by a button cell battery that's included and replaceable. The lens is just under 7/8" dia on a 1" long loupe with a 1-1/4" eye port. The package says 10X, but it looks more like 5X to us, which is still good for a loupe. The battery life for the light is approx 22 hours.
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92982 LED EYE LOUPE |
If You Can't Read This…
You need one of our Senior Specials, a 1" x approx 2" magnifier (2X) in a credit-card size, 1/8" thick mount with a push-button LED light. Has a hole in one corner for hanging on a keyring and a little storage bag. Replaceable coin-cell battery included. We'll pick one in solid black, an antique map print, or rose pattern.
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38002 LIGHT & MAGNIFIER |
Digital Laptop Microscopy
The back-room techies are aquiver over this one, and rightfully so! This handheld digital microscope from Celestron® runs off a USB port and displays the results right on your laptop screen. Magnifies from 20X to 400X. (Has a 7.5mm field of view at 20X; 1mm at 400X.) Resolution is 1.3MP. The unit measures 5" long x 1-3/8" dia with a 60" cord, and a built-in white LED illuminator. Lets you view and capture images or video directly to disc. Enormous possibilities for home, school, medical offices, labs. Comes with an installation CD and requires Windows 98/2000/ME/XP and Vista, a CD or DVD drive, and a USB port. Altogether, an unbelievable digital accessory.
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14466 DIGITAL MICROSCOPE |
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