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Lens->Telescope adapter (Help identify this equipment?)
My father-in-law has come to stay, and dropped off an interesting present he
thought he had lost years ago, but has just found again.
It is an eyepiece adapter than connects directly to a Pentax-fit lens, and
allows you to use it as a telescope. He say he thinks it has an effective
10x magnification, so that a 200mm lens becomes a 2000mm telescope.
It is certainly useful for birdspotting around the garden.
Written around the adapter is
"BOB PATP 54038748 APK TELEPHOTO LENS ADAPTER JAPAN"
Does anyone know anything more about this piece of equipment?
Thanks in advance,
Paul Murray
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Misifus wrote:
> Cisco Kid wrote:
>
>> I'm thinking of buying a macro lens but I have a few questions. Looking
>>
>> at some sites, I noticed macro photography is much more than just
>> buying and using a macro lens. In a generic, explanantion-friendly way
>> - what is macro photography? I'm not looking for a scholarly these
>> paper on the subject.
>>
>> Also, why can't I just use a telephoto lens? What does a macro lens do
>> better than a telephoto lens?
>>
>>
>> Lastly, being that I am mainly a landscape/nature photographer, what
>> kind of subjects are we talking about - small bugs and plants/flowers?
>>
>>
>> CK
>>
>
>
> The big difference between a telephoto lens that's not macro and a macro
> lens is that the macro lens allows you to focus much more closely to the
> lens than a conventional tele. Being able to focus on an object close
> to the objective lens makes it possible to have an image on the film, or
> sensor, which is life size, or larger. That's a macro image. Whether
> what you create with it represents nature, or not, is a different question.
>
> -Raf
>
While the definition of macro photography is life size or
larger, many subjects come out less than life size if you
want them to fill the frame, so then technically it is only
close-up photography.
For example, see this site:
http://www.greglasley.net/index.html
and go to the dragonflies. Many of the dragonfly
images were done with a 300mm f/4 L IS telephoto.
I've seen many of Greg's dragonfly images printed
at 13 x 19 inches, and they are simply astounding.
The telephoto gives you a greater working distance
so you are less likely to disturb the subject.
So determine your subject and the magnification
you desire. As you get close to 1:1 (true macro),
a macro lens will perform better, but for magnifications
less than about 0.5x (subject half life size in the focal
plane) a good telephoto can do wonders (sometimes
you may need a 1.4x TC or an extension tube).
I've personally never been satisfied with the diopter
lenses you put onto a telephoto, even the more expensive ones.
Roger
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