Woaw !

[brian nordstrom (As avatar)]

Heads up people ,, I just looked on Astro Pete's web site and I see they have the sweet SW ED100 for only $899 ,, that's $100 cheaper than the ED80 .

What a bargain , if you were thinking of one of these ,, now's the time .
BTW , I have no affiliation with Astr Pete's , just another amateure like you all ,

Brian.

[nebulosity. (Jo)]

I am also amazed that they are selling the Synguider for $249, compared with $409 from Bintel!

Great stuff for Brisbane

Jo

[Astro_Bot]

Pete is a legend!

But it depends on the distributor: some distributors don't allow much movement in their prices. Tasco (for Skywatcher) obviously isn't one of them.

[2stroke (Jay)]

getting close to end of year Mad price on the ed100 though

[Renato1 (Renato)]

Thanks. Never heard of Astro Pete before today.

One certainly gets a lot for the money. But I'm curious why they say it's
"Highest Practical Power - 200x "

My old 80mm ED telescope can handle 200X, surely this 100mm one should be able to handle at least 300X?
Cheers,
Renato

[Astro_Bot]

The rule of thumb is, "50x per inch of aperture", so 200x for a 100mm (4 inch) refractor is about right. You may be able to get more, but the advertiser is being conservative and that's a lot better than other advertisers who claim ridiculous magnifications for small refractors, notwithstanding the commonly-accepted limit of 300x due to the atmosphere. But see this:

Where does the 50x per inch limit on magnification come from?

[04Stefan07 (Stefan)]

Wow! Prices are pretty good, how is shipping??

[Renato1 (Renato)]

Originally Posted by Astro_Bot

The rule of thumb is, "50x per inch of aperture", so 200x for a 100mm (4 inch) refractor is about right. You may be able to get more, but the advertiser is being conservative and that's a lot better than other advertisers who claim ridiculous magnifications for small refractors, notwithstanding the commonly-accepted limit of 300x due to the atmosphere. But see this:

Where does the 50x per inch limit on magnification come from?

Thanks, but 50X per inch is for reflectors. High end APO refractors - which don't have a central obstruction that pushes light out into the diffraction rings - should typically be able to do much better than that.

I can understand the advertiser being conservative, but I think it extremely unlikely a 4" APO or ED refractor won't get a lot better high power performance than a 4.5" reflector.
Cheers,
Renato