Thanks for replying Christian! Derek
> > > Godfrey DiGiorgi wrote on 4/5/2005, 1:57 PM: > > > On Apr 5, 2005, at 10:39 AM, Village Idiot wrote: > > > > > I have questions about macro extension tubes. Does anyone use > > > extension tubes? On what on what lenses do you usually use them? > > > What is the difference between using extension tubes and using a macro > > > lens? Also, why do extension tubes not work on DSLRs? > > hmmm missed the original post.... > > Anyway, Macro lenses have built-in extension and focus from very close > to infinity. If you use extension tubes on any lens, you lose infinity > focus. > > The one good thing about tubes is that you really don't need to worry > about what brand you buy. Since there is no glass in them (they are > just hollow tubes) you don't need to worry about them affecting image > quality the same way a lens does (just make sure they are light-tight!). > > I use them a lot on my ist D. I have the Vivitar AF set which supports > ALL functions necessary for automatic aperture control and autofocus > just like the "A" lenses. I've used them on my 300/4 Sigma Macro to get > just a little closer. I've used them on a vivitar 105mm macro for more > than life-size images and I've used them with a 50mm both regular and > reverse mounted. > > -- > Christian > [EMAIL PROTECTED] >
