Re: The DSLR Thread Quote:
Originally Posted by clevermax If you are using a macro filter, then you need to use narrower apertures in your lens. For example, to get a bee's round face and some more fully in focus, you might need to use an aperture like f/20 assuming focal length is about 100mm. Quoting this as an example because i saw a sample shot with DCR250 in flickr, and that had and exif like that..
I am still to venture into macro photography, waiting for cheap gears to arrive |
Diopters are useful if you can get the achromats like Nikon 3T (relatively difficult to find) or Marumi DHG achromats (easier). The Raynox DCR250 is supposed to be good at centre but really soft at corners. I don't have one though, so can't say much. Given a choice, I'd spend that $50 and get Marumi DHG achromats than the Raynox DCR 150/250.
And here's some more info I got from mu-43 a while back: Quote:
Divide 1 meter by the diopter to give the distance from subject to front of lens when the lens is set to infinity.
There are 25.4mm in 1 inch. You can also stack where a +2 and +3 = a +5.
+1 diopter = 1/1 = 1 meter from subject to front of lens......(39.37")
+2 diopter = 1/2 = 500mm from subject to front of lens.......(19.69")
+3 diopter = 1/3 = 333mm from subject to front of lens.......(13.11")
+4 diopter = 1/4 = 250mm from subject to front of lens.......(9.84")
+5 diopter = 1/5 = 200mm from subject to front of lens.......(7.87")
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The above should give a fair idea about working distance.
The cheapest way to do macro work (AFAIK) is to reverse a lens. But you'd be exposing the back element, which can cause you to skip a heart beat or two . So, get a cheap 50mm MF lens from somewhere and reverse it . That way you might get aperture control too. Quote:
Originally Posted by clevermax "Use widest aperture possible" still applies here. You need to figure out which is the widest possible by checking the depth of field you are getting...With macro adapters, the widest possible apertures will be relatively narrower than apertures used for normal shots. I can't comment on the aperture values that normally can be used with actual macro lenses, may be HW can throw some light. |
It depends on the magnification actually. But, usually f8-f11 do the trick. What surprises me most is that some macro gurus know the optimal apertures for a given scenario. They ensure that they get a smooth background and have the critter/flower sharp as well. A pretty difficult task if you ask me.
Last edited by HellwratH : 4th April 2012 at 18:06.
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