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Archive 2012 · seeking advice on mag ratio
  
 
Justin Huffman
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p.1 #1 · p.1 #1 · seeking advice on mag ratio


Hey guys - im putting together odds n ends in my kit to come up with the most mag ratio i can without spending any more dough. Here is what i intend to stack and Im wondering what type of mag ratio it will provide. or if someone has a linky to a formula that would be great thank you

PK13 (27.5mm) ext tube > sigma 150 2.8 > Reversed 50mm 1.4

thanks again



Oct 11, 2012 at 07:41 PM
LordV
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p.1 #2 · p.1 #2 · seeking advice on mag ratio


Well the reversed 50mm lens should give you 4:1 at min focus.
M= existing mag + fl main lens/fl reversed lens = 1+ (150/50)
The ext tube will not add too much more (around 0.4) giving a grand total of 4.4:1 approx.

Brian V.



Oct 12, 2012 at 05:55 AM
Justin Huffman
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p.1 #3 · p.1 #3 · seeking advice on mag ratio


wow cool thanks Brian


Oct 12, 2012 at 09:50 PM
MarkB1
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p.1 #4 · p.1 #4 · seeking advice on mag ratio


I'm interested in what the working distance would be with that? I know the higher the mags the shorter the WD, and the longer the FL the longer the WD, but I never got into formula.


Oct 13, 2012 at 03:34 AM





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