Julian,
Yes, we don't want to scratch the front of that lens!! I was
going to
use
it to take your standard flower pictures. It seems like an fairly
inexpensive
addition to my eos gear. I just thought it would be interesting to try
and
put one of these tubes on my EF fisheye.
-Dan
Canada
Julian Loke wrote:
>
> > "Daniel Flather" <[EMAIL PROTECTED]> wrote:
> > I'm considering purchasing a extension tube for close ups. Canon lists
> > magnification with extension tube ef12 for the 15/2.8 at 0.94-0.80, But
> > says extension tube ef25 will not work on the 15/2.8. Is it because it
> > will not obtain focus at any distance? Just a thought. I want to use
> > the tube with my ef 24/2.8, Canon list it's magnafacation at 1.22-1.11
>
> Hi Daniel,
>
> Using a 12mm tube behind the EF 15mm f/2.8 will give a working distance
> of only 2 to 5mm in front of your lens!!! Since the front element of
> that fisheye lens protrudes, you could risk touching or scratching the
> lens :-(
>
> It's a little better for the EF 24mm f/2.8, with working distance using
> 12mm extension of 34-39mm (with 25mm extension, it's only 12-15mm!)
>
> It seems like an exercise in frustration to get light in front of your
> subject at such close working distances.
>
> Do your subjects emit or transmit light?
> Or will you use a macro ring light?
> Or put the subjects on a light table?
>
> Cheers
> Julian Loke
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