Re: horsetail close-ups

I wanted a macro lens for years but like you say they can be expensive. But
luckily i got given a Vivitar 100mm macro from a friend, and yet to buy this
lens new would cost little more than a set of extension tubes, and it is
very light and clear.(Would cost less than #100 in england)
I have discovered that a set of extension tubes for canon EOS is incredibly
expensive, and if you use M42 mount ones with an adaptor you lose all your
metering options, and flash is a nightmare to work out!

It uses a lens that attaches to the front to give 1:1 -it gives half
lifesize without it.
Attaching a 50mm onto it in reverse gives 2x and no light loss(I can still
use TTL flash, how cool is that!)
In fact in good light I could probably hand hold a 'desperate' shot!
Regards
Larry


----- Original Message ----- 
From: "Winter, Wim de" <Wim.dewinter@wur.nl>
To: <ferns@hort.net>
Sent: Monday, May 23, 2005 7:55 PM
Subject: RE: [ferns] horsetail close-ups


> Larry,
>
> I haven't tried yet to couple a lens reversely onto another one. But I
just
> tried pressing two lenses together and found that a single reversed lens
> (28mm) gives a clearer picture and higher magnification than 28+R50,
50+R50,
> or 80+R50.
>
> I assume with "macro lens" you mean the telelens type with a macro
position,
> not the premount filter lens. I have several reasons not to use such a
macro
> lens for plants (animals are a different story!). First they tend to be
heavy
> and quality optics are awfully expensive. But they can be easily mimic-ed
by
> an ordinary tele-lens with an additional extension tube element. But even
then
> the working distance is often too large to be convenient. Furthermore, my
> plants are slow movers, so as long as nobody bumps my desk, the shutter
can
> remain open for hours if necessary. Just as long I got enough light to
focus.
>
> With my present set-up however, I can use old-fashioned, cheap but high
> quality East-German optics that are readily available on the 2nd hand
marked.
> Moreover, the extension tubes confine the light to the central parts of
the
> lens, where distortions and aberrations are the least. It's not yet
optimized,
> but remember this was only my first try.
>
> Wim
>
> -----Original Message-----
> From: owner-ferns@hort.net on behalf of Larry Shone
> Sent: Mon 5/23/2005 3:06 PM
> To: ferns@hort.net
> Cc:
> Subject: Re: [ferns] horsetail close-ups
> Neat set up Wim, sound like you got quite a magnification range(set of 3
> extension tubes plus a 50mm should give at least 2.5 X)
> Do you not have a macro lens or a lens of between 80 and 135mm focal
> length-you would be better to reverse the 50 onto that, then you wouldnt
> suffer any light loss which is inevitable when using extension tubes.
> (I reverse a 50 onto my 100 macro on my Canon EOS 300 which gives 2X
> lifesize)
>
> Regards
> Larry
> ----- Original Message -----
> From: "Winter, Wim de" <Wim.dewinter@wur.nl>
> To: <ferns@hort.net>
> Sent: Monday, May 23, 2005 11:26 AM
> Subject: RE: [ferns] horsetail close-ups
>
>
> > It's a Canon 300D, aka digital Rebel. I mounted it on a dismantled
> binocular microscope, with 3 EOS extension tubes, an eos-M42 adaptor ring,
3
> M42 extension tubes, a reverse ring and an ancient Practica 50mm lens
> mounted upside down.
>
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