So, you wanted to do some Infrared (IR) photo with your Canon EOS 450D/Rebel XSi? Just have a look at the IR tests done by Wayne J. Cosshall. By the way, traditionnally, since the Foveon technology of sensors does not use infrared filters, the Sigma dSLR cameras are very good candidates for IR photo.
Category: Sigma
Focal Length Comparison
Thanks to Tamron, it is possible to easily compare photo lenses of different focal length and their effect on the size of an image. Tamron focal length comparison
Comparison of 80-200mm zooms
DPreview has a good comparison of 4 zoom lenses opening at f/2.8 for SLR cameras: Canon 70-200mm F2.8 L IS USM Nikon AF-S VR 70-200mm F2.8 G Sigma 70-200mm 1:2.8 EX DG Apo Macro HSM II Tamron 70-200mm 1:2.8 Di LD (IF) Macro Since they are one of the most coveted segment of the SLR…
Web sites for lens reviews
It is often difficult to group lens reviews in order to compare/evaluate a little more than their mere physical characteristics (focal length, aperture/diaphragm, or even number of individual lenses). But how would you evaluate/review optical quality? When I see the really impressive differences between two lenses, I would be prepared to judge from their price,…
Sigma SD15, already too late?
The dSLR market is a tough one. Canon and Nikon have the largest part of the money pie here with very large catalogs of cameras aimed at all possible customers (from $600 to more than $5000). Sony arrived later to grab its own share and seems to be succeeding thanks to its Minolta heritage (it…