Re: EOS Re: Quality optics advice please

[lightwriter]

Henry Posner stated:

> For the record, the IS is the 28-135mm f/3.5-5.6 IS EF (USM). The 28~105 is 
> the non-IS 28-105mm f/3.5-4.5 USM EF, of which there are two versions which 
> differ in appearance but not in design or performance.

That isn't completely true Henry. While you're correct that their
optical formulae are identical and that they are different cosmetically,
there is a significant difference in the material used for the helicoid
mechanism.

The mark 2 version of the Canon 28-105 has a more durable material which
helps preserve alignment over a longer period of usage.

-- 
Glass, gas, and go.

Rusty
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