It's probably better that you should buy a good monocular or binoculars.
The eyepiece on these inexpensive camera lens adapters is probably not
very good and is unlikely to have a prism to right the image since there
isn't much back focal length. In other words, everything will be upside
down. I would also suspect some serious vignetting with some or even
all lenses or else a very narrow angle of view.
The magnification will depend on the eyepiece focal length which I would
guess would be somewhere between 12 and 25mm. Divide objective focal
length by eyepiece focal length to get magnification. Probably
somewhere around 8-16X.
You can probably buy some used Pentax, Minolta, Olympus, Nikon or other
camera manufacturers binoculars for about the same amount of money and
have a much better optical instrument with a right-side-up, wide field
of view.
I have a very nice pair of Minolta wide-field 7x35 binoculars complete
with case that I bought on *bay for USD 16. Not Leitz or Swarokski but
they didn't cost $800 either.
Radovan Faltus wrote:
> Hi,
> does anybody have extra telescope adapter for OM?
> For example Vivitar made this.
> For those of you who use it: What is
> binocular equivalent magnification when i
> attach it with 200mm objective?
>
> Thanks,
> Radek
>
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