>I tried putting the extension tube from my 55mm macro lens on my regular
>80~200mm tele. As far as the viewfinder sees it the idea works. Any
>thoughts on using this as a macro setup? It's getting dark out, but I may
>give this a try on some flowers tomorrow.
Of course it will work. That is simple optics, and a set of
extension tubes will allow you to cover a wider range of close-up
shooting than a single fixed length extension tube.
A bellows would cover an even wider range of focusing distances --
though with a zoom the greater magnifications might move your focus
point to somewhere inside the front elements of the lens. :-)
I lose track of which camera you are putting this on, though the
55mm macro, and the 80-200mm zoom suggest that it might be older Nikon
lenses, which will not work with metering on the camera anyway for a D70
(if that is what you have). The extension tubes would prevent that
anyway, unless you have an extension tube which completes the electric
circuit between a CPU-equipped lens and the camera body.
The remaining question is how sharp will it be? That, you will
have to determine by experimentation. (You'll also have to learn to
adjust exposure for the extension, and I'm not sure how to predict that
for a zoom lens, which is trying to be everything for everybody. :-)
But -- it will cost you nothing but some time to experiment,
unlike the days with film. Just use the histogram to fine-tune your
exposure values.
Enjoy,
DoN.

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> I tried putting the extension tube from my 55mm macro lens on my regular
> 80~200mm tele. As far as the viewfinder sees it the idea works. Any
> thoughts on using this as a macro setup? It's getting dark out, but I may
> give this a try on some flowers tomorrow.
Adding the extension tube will bring the close-focus limit of the zoom
in closer, so in that sense it "works". That tube isn't very long, as
I remember it, so it won't bring the close-focus limit all that *much*
closer. And the complex optics of the 80-200 probably won't stand up
really wonderfully to being forced to focus closer, either. Your 55mm
with the tube will give you greater magnification and probably better
quality, but at shorter working distances.
Or, the simple bottom-line version -- So play with it and see if you
like the results!

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frederick - 29 Jun 2005 02:37 GMT
>>I tried putting the extension tube from my 55mm macro lens on my regular
>>80~200mm tele. As far as the viewfinder sees it the idea works. Any
[quoted text clipped - 11 lines]
> Or, the simple bottom-line version -- So play with it and see if you
> like the results!
One of the benefits of a macro lens is zero distortion and great
sharpness and contrast across the frame. You pay dearly for this, when
the reality is that with such a limited DOF, you don't really see all of
the advantages when shooting bugs, flowers etc.
Marumi make a set of auto extension tubes with the electrical contacts
that work fine with a D70. I guess they cost US$100 or thereabouts.
They are not what I'd call high quality, but do the trick. Just the
smallest one (13mm) is a lot of fun with the kit 18-70 lens zoomed
between about 50 and 70mm.
Sheldon - 29 Jun 2005 03:54 GMT
>>>I tried putting the extension tube from my 55mm macro lens on my regular
>>>80~200mm tele. As far as the viewfinder sees it the idea works. Any
[quoted text clipped - 20 lines]
> one (13mm) is a lot of fun with the kit 18-70 lens zoomed between about 50
> and 70mm.
Thanks all. I thought it might be an interesting way to get macro photos
without having to get so close to the subject, but I'd hate to sacrifice
quality. Unfortunately, no chance to try my experiment out as I had to work
all day. I'm hoping to get more of my shots, and some experiments on the
web for display.