 Posted: Mon May 28, 2012 10:49 am Post subject: Re: Step Down ring for lens reversal |
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RenseH wrote:
| skida wrote: |
| Looking through my bag of tricks, I found a step down ring with 52mm and 49mm threads, so I have worked out I can put a reversed standard lens on the front of one of my telephoto primes or zooms. The trouble is I don't know anything about this technique for taking close-ups. I am especially puzzled about calculating exposures when the light has to travel through two diaphragms. Can anyone give me enlightenment about using this equipment combination? Which lens does the focusing? |
Thank you for commenting on my bug photos! I use a reversed 50/1.7 lens on a 90/2.8 lens indeed. The reversed one stays open all the time, it's more or less used as a very strong diopter on top of the macro lens I use. With such strong magnification rates, there is a lot of light needed, also because you will need an f-stop around f/16 or so to have at least a bit of DoF..... It can be done in available light, but you will need bright sunlight....
The lens mounted on the body does the focussing as well. Just consider the reversed lens as a magnification glass in front of your regular lens. I can't help you with the calculation part, I am a noob about that. Just trial and error here... But probably there is some info on the net about that...
If you consider flash light, you can use an external flash with diffuser as well as the pop-up flash with a tubular diffuser. I wrote on both topics on my blog, you could check that. http://renseblog.stellaria.nl/#home Please, feel free to ask if there are still questions!
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Rense
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