The most powerful binoculars...

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David Frydman
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Post by David Frydman »

Sherwoods Evostar 120mm f/8 on EQ5? £425 ?
That might work if you have a large room.

It would be best to see some of these scopes in the flesh, these larger ones.
Perhaps at the Widescreen centre in London.

OR ASTROFEST Feb 2012 ?

Regards, David

See previous page.
Peter1959
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Joined: Thu Dec 08, 2011 8:31 pm
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Post by Peter1959 »

Hi David,

Thanks for your comments and advice.

Although aperture size is a primary consideration, in my case I appreciate practicalities need to be considered first. As my observing is done indoors through an open window, a 3.5 or 4in refractor might be a better choice.

Still, I'm in no hurry just yet, my 5.1in reflector performs well.



Regards
Peter
Lady Isabella
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Post by Lady Isabella »

Peter

I have an Evostar 150mm f/8 fitted with bino-viewers, it is big and heavy, the last thing
I would won't to do is stick it out of a window.

David- Regarding the Zeiss 130mm (Asal) binocular telescope, I once saw one of these
that had been made for a very wealthy (might even have been Royalty) family in Austria from
around the 1910 - 1915 period. The tubes were encased in brown stitched leather
with all brass sun shields and turret eyepiece holders. It was and remains the most beautiful
piece of optical equipment I have ever seen.
David Frydman
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Joined: Mon Jan 18, 2010 9:25 am
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Post by David Frydman »

Currently in at least 2 newspapers and amazingly Warehouse Express.

25 to 110 x 30 Sunagor binoculars. Half price at £97.99 or £99.99.
Stocks are limited etc. so buy now to avoid disappointment.
Perfect for country walks, birdwatching etc. etc.

At least they have a tripod socket.

Let us examine this.
At 110x we have here a binocular supposedly capable of taking 90x per inch.
Only some of the world's top optics like Televue or Takahashi can do this reliably, and that is pushing it.
The only time this would be used is for fine testing or very close double stars.

At 110x the real field is probably 30 arcminutes.

The bird had better stay mighty still to see it.

If anyone seriously wants to try these it might be prudent to test them extensively.
Are they fully collimated at 110x with an exit pupil of 0.27mm.
Are they collimated for different people's interpupillary distance.
Can you actually see anything in them except motes in your eyes.

They 'Fit in the pocket'

Do these sales outlets seriously suggest anybody can hand hold these at 110x.
I suppose if you were frozen solid you might be able to. Or I imagine the Monty Python parrot or ex parrot might succeed if nailed to his cage.

an 8x 30 or 10x30 binocular Yes. But 25 to 110 x30. Really!

I would estimate that around 1 or 2 % of these binoculars are collimated at 110x. More by luck than anything else.

And the star images at 110x again may be 1 or 2% might be reasonable in both barrels, Again by luck.

But why do these outlets peddle 25x to 110x 30 binoculars?
Because making money seems to outweigh ethics.

Regards, David
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