[Cameramakers] missle lens
Try this link for the lens/scope: http://www.geocities.com/mpc1968us/Misslelens I started putting together some PVC tubes together to hold a focuser. I also painted the outside a metallic blue color. The guy I got this from sells alot of these things on ebay. I have one extra if you are interested.
Re: [Cameramakers] Missle Lens
Sorry, but Geocities can't find the page (not surprising). The lens sounds like a goodie; where from, how much and are they still available? bye, sid. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Enlarger lights, focusing motors, booksetc...
<<< (maybe with a potentiometer to vary the speed.)>>> DC motor- good. Potentiometer, not good. Wantum rheostat. The rheostat is very much like a pot but with a winding that can carry real power, rather than being simply an adjustable voltage divider. It is a 2-terminal device used in series with the motor to vary the amount of current flowing through it and must be rated to carry full motor current load which, in the case of a small DC motor, is not likely to be much over 2 or 3 amps at 12 volts which means a 25 watt or so rheostat, probably not over 250 ohms resistance. Not expensive. In many cases, the field and armature windings are brought out of the motor sepaately and the usual practise is to keep constant current on the field and vary only the armature current, thus maintaining better torque over a wider range. Another advantage of DC motors with separate connections is that they are easy to enclose inside a servo loop where you set a pot to a position that the motor then takes up. A servo loop would allow you to set up a focus scale, turn the control pot to a specific setting and the focus motor would drive the lens to that position and stop. Have fun, bye, sid. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Hot cathode (conventional) fluorescent ballast schematic posted
Bob Mueller expressed interest in seeing a schematic/article I just found, depicting a 4-pin 7W compact fluorescent electronic ballast. I've scanned it and posted it on one of my websites. If you access the directory, you will find in it .jpg, .bmp and .pdf format. I was unable to produce .pcl as far as I know. www.multi-volti/ballasts/ due to the lack of index or default html file in this directory, a listing of the three files will display. I may be able to answer questions as I designed ballasts for 2 years about 7 years ago. Anyone attempting this circuit should be aware of a few things. 1) It will not work with 2 pin lamps which have an internal starter. 4-pin lamps are compatible with this circuit. 2) The 1000 VDC capacitor across the lamp must be polypropylene, metallized preferable to foil (Mylar/polyester will overheat). In my experience with small lamps 630 V will probably suffice 3) I'm sure less 'brutish' MOSFET's will work.. 4) Beware of high voltage on the output circuit. 5) Beware of the electronic noise and interference such circuits are prone to producing. Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Missle Lens
Has anyone ever hears of R-ANAD? I purchased a missle lens recently and it is of very high quality. A large Achromat/ Doublet I think. It has a short focal length of about 250mm and the diameter of the lens is 80mm. A beautiful Blue/Purple coating and brand new. I looked though it with a 30mm eyepiece and it looks as if it will make a great wide field scope. I plan to mate it to a Bausch&Lomb Binocular Miroscope head and a fousing unit. It also should produce some nice wide field shots, so I am buying another to mount onto a sastro camera I am building. Anyone with any Idea of what the gov specs on this lens are? Or the Manufacture identity? It is dated 1977 and is from some sort of Missle .Here is a pic. http://www.geocities.com/mpc1968us/misslelens <>
Re: [Cameramakers] Enlarger lights, focusing motors, books etc...
> In short, the small, inexpensive, gear-reduced, reversible, 3-wire >capacitor run motor is by far the simplest way to go. > Have fun, bye, sid. Perhaps, but almost as easy is a DC motor with a gearbox. The beauty of it is the ease of reversal (reverse polarity of power) and the ease of speed control, so the last bit of adjustment can be done at a small speed (maybe with a potentiometer to vary the speed.) Bob ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
