Julian Loke wrote:
>
> 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?
Nothing good, that's sure. Likely quite extreme falloff in sharpness
off center. One of those el cheapo close up lenses does enough damage
to the image already, I wouldn't expect this to get much better with
three of them stacked ;-) The result is most likely unusable IF you
need off center sharpness.
Thomas Bantel
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