> "Syed Asad Ali Zaidi" <[EMAIL PROTECTED]> wrote:
> What about the Hoya or Tiffen 72mm Close-up Kit
> (+1,+2,+4) Lens. Has any one used these with the
> 28-135 and can these be used to get a 1:1
> magnification (hand held). Also what is the effect of
> these close-up lenses on the sharpness and contrast of
> 28-135.
Hi Syed,
In order to get a magnification of 1:1 on a 135mm lens
set to infinity, you would need to put a 135mm close-up
lens in front. This corresponds to a 7.4 diopter lens.
You could achieve close to this by stacking all three
single-element lenses in the kit together: 1+2+4=7
If you would send me a set for free, I would be happy to
compare it against the Canon 500D :-) And to see how bad
is the chromatic aberration, and if the multi-coating on
the close-up lenses is as good as they say.
What effects were you expecting on sharpness and contrast?
Cheers
Julian Loke
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