That's probably what I'll do eventually, but I have serious problems getting rid of the fibre optics idea... :-)
We'll see. Cheers, Jostein 2007/8/22, Toine <[EMAIL PROTECTED]>: > Hmm that would be my dream led ringlight. probably not. > > Maybe you should try a ringflash like this one: > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=160146845797 > > They popup everywhere on ebay, sometimes very cheap. It won't do ttl. > Voltage is below 7V and save on the K10D. > I set the flash to full power, ISO 100 and aperture somewhere between > 11-18. which results in perfect exposure with a F100 macro at 1:1. > > > On 8/22/07, AlunFoto <[EMAIL PROTECTED]> wrote: > > I bought a "Digislave 6400" from B&H just a week and a half ago. Mfg. > > website here: > > http://www.srelectronics.com/fr6400.html > > > > It's alledgedly very powerful, but not at all in the league of > > ordinary ring flashes. > > > > Not really useful for insects, imho. > > > > Did a write-up in my blog on the same issue the other day. > > http://alunfoto.blogspot.com/ > > > > Jostein > > > > > > 2007/8/22, Toine <[EMAIL PROTECTED]>: > > > Why not. If you have the fibers you could try this. > > > Much easier would be two 360 with diffusors on a flash bracket > > > (novoflex or manfrotto). > > > > > > Another option I want to test are daylight high power leds. On ebay > > > led ringlights can be found. I have found several cheap and very > > > compact led flashlights. combine 4 of these and the result is a led > > > ringlight. > > > > > > On 8/22/07, AlunFoto <[EMAIL PROTECTED]> wrote: > > > > Here's a question for the technically curious. > > > > > > > > Do you think it will be worthwhile to use fibre optics to lead light > > > > from an ordinary flash (eg. Pentax 540 FGZ) into various > > > > configurations for macro flash purposes? > > > > > > > > I can't get the idea out of my mind, and probably need some healthy > > > > counter-arguments... :-) > > > > > > > > The pros I can see are: > > > > > > > > There is no P-TTL-enabled macro flash for Pentax. Using fibre optics > > > > with an ordinary flash could provide this. > > > > > > > > Theoretically, one should lose far less light per distance through > > > > fibres than the inverse square law that applies through air. So > > > > leading the light to where the motif is could allow for flash light > > > > with a very reasonable GN. > > > > > > > > Using thin fibres in slim cables, eg. 20 fibres in Ø 5mm cables, the > > > > individual cables are flexible and can be arranged in many > > > > configurations. Ring flash can be simulated, as well as setups more > > > > weighted to the sides. > > > > > > > > Optic fibres are lightweight, and will not place much extra weight or > > > > bulk at the front of the lens. Contraptions for attaching the fibres > > > > not considered, of course, but how bulky can they get? > > > > > > > > On the con side, I see that the 5mm cables probably have to be bundled > > > > by a professional towards the flash. I believe it's only possible to > > > > construct circular bundles, so a part of the flash output may not be > > > > shunted into the optic fibre. But at the moment, this is not at all > > > > enough to stop me from thinking about this...:-) > > > > > > > > Anyone have better counter-arguments? > > > > > > > > Please? :-) > > > > > > > > Btw, I know that Novoflex has a fibre optic solution for macro flash, > > > > but that's not what I'm thinking of. The Novoflex unit is a large, > > > > bulky adaptor that looks more like a microscope light source for the > > > > lab than a portable field solution. > > > > > > > > Cheers, > > > > Jostein > > > > > > > > -- > > > > http://www.alunfoto.no/galleri/ > > > > http://alunfoto.blogspot.com > > > > > > > > -- > > > > PDML Pentax-Discuss Mail List > > > > [email protected] > > > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > > > > > > > > > > -- > > > Toine > > > http://leende.net > > > > > > -- > > > PDML Pentax-Discuss Mail List > > > [email protected] > > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > > > > > > -- > > http://www.alunfoto.no/galleri/ > > http://alunfoto.blogspot.com > > > > -- > > PDML Pentax-Discuss Mail List > > [email protected] > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > > -- > Toine > http://leende.net > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
