Achromatic-Diopter in 2 easy steps

by Daniel Schweinert

e-mail: ilm1@gmx.de
Ok, so you need an achromatic diopter for your 35mm DOF adapter. Maybe this tutorial saves you some cash and you can buy a vibrating gg-holder from me ;-) Dependig on your camcorder lens you will need an achromatic diopter to focus on your 35mm adapters groundglass. I used an old tasco 10x50 binocular with coated frontlenses from ebay for 15,- bucks. For camcorders with small lens (Sony HC1, Panasonic NV-GS400/500) this binocular with 50mm is ok. If you want to shoot HDV with (Sony FX/Z1, Panasonic HVX200) you will need binoculars with bigger frontlenses 60mm or more to use only the sweetspot of the lens. Technical data for this 10x50 tasco binocular: Achromatic frontlenses 50mm Magnification 10x (focal length for one achromat is 1 / 0.265m = +3.77 diopters) If you put both frontlenses together you get an very cheap coated achromat with +7.5 diopters for your 35mm adapter. If you need more diopters try binoculars with 7x50. The focal length of the achromats is changing from manufacturer to manufacturer so you have to try.
1. Get yourself a cheap binocular i.e. from ebay
Search for a cheap binocular (I used a tasco 10x50 for my little camcorder) i.e. in ebay. The old binoculars from Zeiss, Tasco are far better because they have coated lenses that can be unscrewed. The very cheap noname brand binoculars are mostly glued and you will need to saw them off. Open that binocular and take out the frontlenses. Use a screwdriver to open the threads (Be careful not to scratch the lenses).
2. Search a holder for your achromat lenses
For the 50mm Achromats you will need two 58mm Filters to hold that lenses. If you dont have 58mm Filter try to use a piece of pvc pipe. Use silicone or heat glue to fix the lens in the Filters or pipe. To avoid barrel distortion face each lens like in the drawing below. Thats all, have fun with your new achromatic diopter.
Here is my selfmade Achromat with +7.5 I made a lens holder on my cnc-machine to fit exactly my adapter.
If you need custom made parts or vibrating gg-holders visit my homepage at: http://www.jetsetmodels.info/holders.htm e-mail: ilm1@gmx.de

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PANASONIC Camcorder CGA-DU21 Batteries
By www.battery-store.co.uk Dated: Jul 24, 2009
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