As I've done a little research (still couldn't find some table with proper/exact data, so I must rely on some collected conclusions after reading some threads on Web..) :
- subject which appears REALLY important for me is maginification/bare
distance from the subject (counting from the beginning/end of the lens..)
- for comparison matter I would be highly interested in getting the same data for other, popular macro lenses..
So.. I'll start with Sigma 150/2.8 Macro
- 20 cm
(38 - this number is the "official" MWD based from counting from matrix),
- 34 cm
(subtracting 18 from 52, I'm not sure if this figure is correct
- 45 cm
(after reading one of the Thomas topic here..),
- no data
- no data
- no data
And if I get the magnification matter right, then if CMOS matrix from 50D is 22,5 x 14,8 mm, then at 1:1
magnification the same sized object would cover the full "frame"/image, right? Or in other words the 1cm long ant would be the same 1 cm on the matrix, yes?
- > So the 1:2
magnification would be like covering the rectangle of 45
(22,5 x 2) x 29,6
(14,8 x 2), right?
And at 1:3
magnification would be sth like covering the rectangle of 67,5
. I drew such rectangles like the ones given to 1:1, 1:2 and 1:3 magnification and now I have some idea of how big would some insect would be on the frame.
I would be INTERESTED for these figures especially for the lenses "in bold":
- Canon EF-S 60 mm f/2.8 Macro USM,
- Canon EF 100 mm f/2.8 Macro USM
(I guess that "100L" is pretty much the same in this matter..),
- Canon EF 180 mm f/3.5L Macro USM,
- Sigma 50 mm f/2.8 EX DG Macro
- Sigma 70 mm f/2.8 EX DG Macro,
- Sigma 105 mm f/2.8 EX DG Macro,
- Sigma 150 mm f/2.8 EX DG HSM APO Macro
- Sigma 180 mm f/3.5 EX DG HSM Macro APO
- Nikon Nikkor AF Micro 60 mm f/2.8D,
- Nikon Nikkor AF-S Micro 105 mm f/2.8G IF-ED VR,
- Nikon Nikkor AF Micro 200 mm f/4D IF-ED.