Was going to get the 17-40mm for $699 at BH for myself for Xmas but am stumped now that Adorama has the 70-300l is for $1099. I could probably get $350 for my non-l 70-300is on ebay so the lenses would in essence cost the same amount.
question about the description of the 70-300l - note below in red
Designed to deliver ultra-high quality images along with lightning fast operation, the new Canon EF 70-300 f/4-5.6L IS USM telephoto zoom lens brings a favorite zoom range to the celebrated Canon L-series of lenses.
It features two Ultra Low Dispersion (UD) elements for improved image quality and reduced chromatic aberration, incorporates a floating focusing mechanism for sharpness from close up to infinity, plus an IS system that increases usability by approximately four stops.
The EF 70-300 f/4-5.6L IS USM features a function that prevents erroneous operation when the lens is mounted on a tripod or monopod. Gleaming white, with an optional removable tripod collar, dust and water resistant construction, and a newly developed Fluorine coating that keeps soiling, smears and fingerprints to a minimum, its phenomenal performance and flexibility is assured.
what does that mean? it auto detects when the 70-300l is on a monopod. I use my 100-400 on a monopod and keep the IS on all the time? does this have anything to do with the 70-300 not having a tripod collar? sorry if this has been discussed before, I haven't had time to look at past postings about this lens and have to order by Jan 5.