- Milburn Double White Core 8quot x 10quot Mat for 5quot x 7quot Photos Pompano White with Williamsburg Green Border and a Beveled White Accent around Window
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Novatron V400D Pack with 3 Heads amp Sync Cord NTPHGV4003C Pack, Head Group kit does not include umbrellas, stands, or a case. V400 D is an infinitely variable power pack. unit reaches a whole category of photography offering 400 watt secs of seamless variable power over a 3 stop range down to 1 8 power compactness of V240 D Power Pack. Novatron Flash Lighting A.C. Packs Heads System Outfits |
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Da Lite Designer Contour Electrol Square Format Electric Wall and Ceiling Projection Screen with Integrated Infrared Remote 84 x 84 High Power Surface DLDCEI8484HP High Power A technological breakthrough, combines reflectivity of a glass beaded surface ability to clean surface when required. Its surface offers gain of all types of screen surfaces moderate viewing angle. Screen surface can be cleaned . Flame retardant, mildew resistant. Da-Lite Audio Visual Projection Screens Wall Ceiling Ele |
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Optec 2 TCF S Temperature Compensating Focuser Serial Version with RS 232 Capability OP17670 1 of single greatest detriments to taking astronomical images is focus shift due to changing thermal conditions. A small change in ambient temperature can cause otherwise sharp stellar images to bloat in size ruining final image, wasting observing time. Someone needs to develop a focusing system which compensates for temperature changes, holds focus steady night. Optec has developed a system. Mech Optec Binoculars Telescopes Telescopes and Accessories anically, TCF S is a Crayford style motorized focuser high repeatability. Crayford design allows for a solid friction roller focusing system no play, backlash. Optecs implementation is for applications which require exact focus as CCD imaging or film astrophotography. A geared stepper motor rotates drive shaft 1 step rotation of motor equal to a 0. 00008 inch movementof drawtube. A pair of pushbuttons control direction of focus, DRO digital read out displays position. TCF S focuser can handle cameras, instrument packages weighing upto 10 pounds. Unique to TCF S focuser, an electronic controller system monitors telescopes tube temperature, compensates focus accordingly. A small temperature probe is attached to side of telescope tube, monitors temperature a resolution of 0. 1C. For a typical Schmidt Cassegrain of 8 to11 inches aperture, f 10 focal ratio, back focus will move approx 0. 010 inches for e1C change in telescope temperature. It is not unusual during an observing session for am |
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- Milburn Double White Core 8quot x 10quot Mat for 5quot x 7quot Photos Pompano White with Williamsburg Green Border and a Beveled White Accent around Window - Copyright 2010 Trekking Klub - All rights reserved.
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