Close up lenses decrease effective focal length of
whatever lens they are used on. In my opinion they are
a viable tool if used within their limits. Advantages;
cheap, small, light, no siginficant light loss and
helps that 135 3.5 AG Proboscis Ken just purchased to
get closer than 5 ft. Get the 2 element ones if you
can, Minolta has them in 49mm at about +.94, +2, and
+4, $29.95ea. at B&H. John Robison
--- DBellamy2k@xxxxxxx wrote:
> From: Frank van Lindert
> Subject: Re: [OM] Close Up Lenses
>
> << With close up lenses you won't face loss of
> light, as you would with
> extension rings. And in macro work any extra light
> is most welcome! >>
>
> At first glance this seems likely, but is it true?
> Does the close-up lens
> increase the effective focal length of the lens (and
> does that matter in
> itself?), and do you maybe get light loss by making
> the image circle bigger
> so you get less light on the film, for instance?
>
> > Dave Bellamy.
> http://members.aol.com/synthchap/
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