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Post by andrea on Aug 27, 2006 7:42:59 GMT -2
Hi Harold,
Thanks for the info and advice. This treat is a one-off, so I want to get it right. I have to use a tripod, so when I creep up on an insect, my tripod creeps up with me! I then find, if I do get close, that I can't focus, so I will certainly have a look at extension tubes. My worry would be that my Canon EOS20D, doesn't like high ISO's or low light - produces noise. I've just seen a review of a Sigma 70-200mm f/2.8 ex dg macro hsm lens which apparently allows focus at 1m. That sounds interesting. Thanks again for the help.
Andrea
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Post by Harold on Aug 27, 2006 10:08:33 GMT -2
For the background to this see: pbpa.proboards104.com/index.cgi?action=display&board=hif&thread=1156681162Sigma make some very good lenses and an f2.8 zoom is really something. Be warned, that one is a bit heavy. as fast lenses tend to be. My article was on the assumption that flash (the answer to many macro problems) was not appropriate, due to fall-off of illumination behind the subject. This can be minimised by lighting from above. With film, an image which does not fill the frame can be made to do so, using a zoom slide copier. Digital images can be selectively cropped too. Either will show up any lack of sharpness in the original. Just to be a bit more of a wet blanket: for maximum definition you should, ideally, use a lens at its optimum aperture. That is usually a stop or two down from maximum but, with the more expensive ones, this may be less of an issue. Lens test data, as generated in tests for e.g. Amateur Photgrapher, will cover this. In general, I strongly recommend reading up on the specification of any lens and any reviews of performance, before considering a purchase. www.sigma-imaging-uk.com/lenses/telezoom/70-200mm.htm whatdigitalcamera.com/equipment/review/Sigma_70-200mm_f/2.8_EX_DG_Macro_HSM_11225.phpOne tip, I don't know if it is relevant to digital SLRs, is to replace the ground glass viewing screen supplied with the camera with a Beattie Intenscreen. They make the image in the viewfinder several stops brighter, important when using teleconverters or extension tubes and also very valuable for everyday photogaphy. They cost around £70-80. Harold |
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Post by andrea on Aug 27, 2006 14:28:36 GMT -2
Thanks again. I have to confess I've never heard of a Beattie Intenscreen - wish I'd known about it when I was using film! Will look into it.
Andrea
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Post by Harold on Aug 28, 2006 4:13:38 GMT -2
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Post by wowposter on Nov 5, 2008 12:45:09 GMT -2
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