How far away the target can Ibe to get 1:1 with 50mm, 100mm and 150mm?
The sigma 150mm is sooooo expensive.
Here is a table of working distance (dist from front of lens to subject at min focus) I pinched from another thread for canon macro lenses
EF-S 60mm Canon = 10 cm WD @ $440
EF 100mm Canon = 15 cm WD @ $480
HSM 150mm Sigma = 20 cm WD @ $620
180mm Tamron = 26cm WD @ $690
EF 180mm Canon = 25 cm WD @ $1,300
For anybody on a budget, that already has a high-quality digicam (Sony F828, KM A2, for example), you can get a close-focus lens attachment. This little accessory can get you a genuine 1:1 macro capability, and the quality is quite good.
The advantages:
The accessory lens is fairly inexpensive, ~ $70-$80 USD.
Digicams have greater DOF per f-stop, better utilization of light.
Digicams will flash-sync at almost any shutter speed.
The total cost of a used digicam plus close-focus lens can be less than an equivalent dSLR lens alone.
The Konica-Minolta A2 has built-in IS, which works with the accessory lens.
I still use a CoolPix 995 3Mpxl camera for shooting text and flat printed images. The files are easy to edit, and the depth of field just can't be equalled with a DSLR.
Screw on macro lenses are really just fancy bifocals for your camera and work just fine.
Canon makes the similar attachments their 58mm, 72mm, and 77mm filter threads as the 250D or the 500D. But they are 2 element lens designs, rather than just a simple plus convex lens.
Comments
The sigma 150mm is sooooo expensive.
EF-S 60mm Canon = 10 cm WD @ $440
EF 100mm Canon = 15 cm WD @ $480
HSM 150mm Sigma = 20 cm WD @ $620
180mm Tamron = 26cm WD @ $690
EF 180mm Canon = 25 cm WD @ $1,300
For my 105mm sigma lens it's about 12 cms
Brian V
http://www.flickr.com/photos/lordv/
http://www.lordv.smugmug.com/
The advantages:
The accessory lens is fairly inexpensive, ~ $70-$80 USD.
Digicams have greater DOF per f-stop, better utilization of light.
Digicams will flash-sync at almost any shutter speed.
The total cost of a used digicam plus close-focus lens can be less than an equivalent dSLR lens alone.
The Konica-Minolta A2 has built-in IS, which works with the accessory lens.
Enough words, here is a sample:
... and a 100% crop:
The setup:
The flash diffusor:
ziggy53
Moderator of the Cameras and Accessories forums
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Screw on macro lenses are really just fancy bifocals for your camera and work just fine.
Canon makes the similar attachments their 58mm, 72mm, and 77mm filter threads as the 250D or the 500D. But they are 2 element lens designs, rather than just a simple plus convex lens.
Moderator of the Technique Forum and Finishing School on Dgrin