> "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
P.S. Pierre, the link was in an earlier post. You should look in the
archives: http://bobatkins.photo.net/info/faq30/closeup.htm
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