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#31
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In article coh.net,
Philip Homburg wrote: In article , DoN. Nichols wrote: Not a consideration on the Cannon, but my Nikon D70 has a minimum ISO of 200, and this prevents me from shooting at the highest magnification range of the old 200mm Medical Nikkor (with the built-in ring flash). It does the exposure calculation based on an ISO (actually marked as ASA) setting ring, and a magnification ratio ring, resulting in setting of the aperture ring. What may work is to set the shutter speed sufficiently high that only part of the flash output is captured . This works on the D1 (though I didn't try it with a medical Nikkor), and I think that it is also supposed to work with a D70. According to what I'm reading my new 420EX flash on my 300D can sync at "any" speed if a switch on the flash is set to "FP". It does this by doing a 50KHz (I think) strobe effect and the power is reduced as a byproduct. It's recommended for fill flash in bright sun. I haven't played with it. -- a d y k e s @ p a n i x . c o m Don't blame me. I voted for Gore. |
#32
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In article , Al Dykes wrote:
In article coh.net, Philip Homburg wrote: In article , DoN. Nichols wrote: Not a consideration on the Cannon, but my Nikon D70 has a minimum ISO of 200, and this prevents me from shooting at the highest magnification range of the old 200mm Medical Nikkor (with the built-in ring flash). It does the exposure calculation based on an ISO (actually marked as ASA) setting ring, and a magnification ratio ring, resulting in setting of the aperture ring. What may work is to set the shutter speed sufficiently high that only part of the flash output is captured . This works on the D1 (though I didn't try it with a medical Nikkor), and I think that it is also supposed to work with a D70. According to what I'm reading my new 420EX flash on my 300D can sync at "any" speed if a switch on the flash is set to "FP". It does this by doing a 50KHz (I think) strobe effect and the power is reduced as a byproduct. It's recommended for fill flash in bright sun. I haven't played with it. Intersting -- though how it can be applied to the situation above, a Nikon D70 camera body, and a truly antique Medical Nikkor with a built-in ring flash (old enough so the only semiconductor in it is the rectifier in the HV power supply.) If this were a modern enough flash so it could be set to reduced output, the whole problem would go away. :-) Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#33
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#34
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#35
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In article ,
wrote: On 10 Aug 2005 23:49:31 -0400, (DoN. Nichols) wrote: The lens is capable of going down to a 3X magnification ratio, but the closest that I can get at present is a 2/3X magnification ratio because of the exposure situation. Why not try to diffuse and/or partially block the flash to control the light. I have no idea what your lens flash looks like but I have an old Viviitar ring light and I can tape a thin paper ring on it to cut the output in half. The ring flash is built into the lens body. If you want some excellent photos and drawings, take a look at the following recently closed eBay auction: Auction Number: 7536353068 Full URL: http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7536353068 I have already received such a suggestion, and essentially a ring cut from a neutral density filter gel would work nicely for the purpose. I also, while examining an older separate ring flash which I had stored away discovered that it had a rheostat between the lamp and the capacitor, which adjusts the output through perhaps a 4:1 ratio (I'm not sure, as I don't have a flash meter.) At the very bottom of the range, the flash will not trigger -- but a 4:1 ratio should be sufficient for my purposes. And that could be put in a cord between the power supply and the flash head. Enjoy, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
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