rod_klukas

Update from ARCA-SWISS - 5x7 format Jean-Pierre Pieve, our new managing director as of December 2021, has announced the return of ARCA-SWISS 5x7 formats. As of today, any F-line or M-Line camera may be ordered in 5x7 format. Remember, MicroOrbix tilt must be ordered at time of purchase of camera to ensure its installation. Also announced and available to order are 171 series wide angle leather bag bellows. I hope this clears up any confusion. Contact your dealer or myself if you have questions. Rod Klukas Arca-Swiss US Representative & International Tech Rep 480-206-4770 rod.klukas@arca-swiss.com

There is an easy calculation for bellows compensation. Requires you know the focal length of your lens in inches. And you need a pocket tape measure. So say you have a 150mm lens. and you have extended the bellows 9 inches. The 150mm is close to 6". So you have 6" and 9" . Instead of thinking of these with inches in mind, now make them Apertures. So F 6 and F9. What is the exposure difference? F6 is 5.6 1/3. F9 is F8 1/3. = 1 stop. thats it done. With a little practice you can do this in about 30 seconds.... If I have a 210mm lens, about 8". And I have extended it and the bellows measured just a tad over 16". What is my bellows compensation? F 8 to F16 is 2 stops. Done. Oh by the way, when ever bellows extension is twice the focal length( for telephoto designs which are not good up close anyway) the reproduction ratio is 1:1 Life-size and the compensation is always 2 stops. If the bellows extension is 1.5 times the focal length, the reproduction ratio is 1/2 life size and the compensation is always 1 stop. Hope this helps. Rod Klukas US Representative Arca-Swiss International Technical rep Arca-Swiss