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Reversing the lens...
May 29, 2015 11:13:52 #
Need help understanding what "magnification factor" I can expect when reversing a lens... say, a 50mm lens. Anyone know a formula for guesstimating the mag factor?
May 29, 2015 11:15:06 #
May 29, 2015 12:26:27 #
Here is an explanation and a formula:
http://photo.stackexchange.com/questions/18755/how-can-i-calculate-magnification-ratio-i-get-by-reversing-a-lens
http://photo.stackexchange.com/questions/18755/how-can-i-calculate-magnification-ratio-i-get-by-reversing-a-lens
May 29, 2015 12:59:57 #
SonyA580 wrote:
Here is an explanation and a formula:
http://photo.stackexchange.com/questions/18755/how-can-i-calculate-magnification-ratio-i-get-by-reversing-a-lens
http://photo.stackexchange.com/questions/18755/how-can-i-calculate-magnification-ratio-i-get-by-reversing-a-lens
cool... thanks for the research... the article suggests that "try it" is the best guesstimate... sounds like good info... :-)
May 30, 2015 10:16:45 #
Here are info sheets that Nikon packed with their reversing rings. Should be close to the same regardless of maker. Note that the wider angle the lens, the greater the magnification & the closer to your subject...
May 30, 2015 11:32:41 #
May 30, 2015 11:59:44 #
i use a 50mm lens , easy to use , a 28mm get tough , too close to subject , magnifies too much .with a quality 50 , you can crop , and still have a good sharp picture .i can send samples on a email address .
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May 30, 2015 12:13:27 #
agillot wrote:
i use a 50mm lens , easy to use , a 28mm get tough , too close to subject , magnifies too much .with a quality 50 , you can crop , and still have a good sharp picture .i can send samples on a email address .
thanks for the advice... I guess it's time to try the 50mm on a test setup... thanks again...
May 30, 2015 19:44:55 #
billgdyoung wrote:
Need help understanding what "magnification factor" I can expect when reversing a lens... say, a 50mm lens. Anyone know a formula for guesstimating the mag factor?
I prefer the use of stacked lenses, a primary lens attached to the camera and a second lens reverse mounted in front of the primary lens. The reversed lens must be a prim, the primary lens can be either a prim or a high quality zoom. This preserves all of the functions of the primary lens and is much easier to use. It is no more expensive than the single reversed lens system, as most of us have a suitable zoom, say a 70 - 300, and a 50 prime. The equation for determining magnification is (focal length of the primary lens / focal length of the reversed lens) .IE 100 / 50 = 2 or 200 / 50 = 4. Note you can get very extreme magnification this way.
May 30, 2015 21:04:23 #
RDH wrote:
I prefer the use of stacked lenses, a primary lens... (show quote)
good info... thanks, I think I'll try that as well...
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