Refractor type Telescopes

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Achromat Vs Semi-APO Vs APO - What's The Difference?

Last post by notFritzArgelander « Sat Aug 17, 2019 10:15 pm
Replies: 2
by JayTee » Sat Aug 17, 2019 9:58 pm

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The notion for this article hit me this morning as I was perusing my email Astro-Ads .

I thought this topic would be a relatively easy define and go...

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Thanks for posting this. It's sane. It also shows that the double versus triplet distinction is not meaningful. It's an oversimplification of a more...

2 Replies

25 Views

Last post by notFritzArgelander
Sat Aug 17, 2019 10:15 pm
Got a new 6 inch this morning.

Last post by Don Quixote « Sat Aug 17, 2019 10:37 pm
Replies: 19
by Don Quixote » Fri Aug 16, 2019 7:42 pm

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My buddy Henry and I talk on the phone just about every day. He has been a benefactor in the past. He claims I lead him down the primrose path and...

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At the spot price that seems like quite the bargain. BUT you went and spent some of you Post-Apocalyptic spending money. It should have higher...

19 Replies

118 Views

Last post by Don Quixote
Sat Aug 17, 2019 10:37 pm
Takahashi announces 4" fluorite

Last post by DeanD « Sat Aug 17, 2019 11:07 am
Replies: 5
by notFritzArgelander » Sat Jul 27, 2019 7:28 pm

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Specs look very nice. I wonder what's the price? ;)

AH $2850. Missed it first read through.

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Thanks for this not_Fritz!

That is an excellent multi-wavelength Strehl for a doublet: compares very well with their old FS-102: even better in the...

5 Replies

122 Views

Last post by DeanD
Sat Aug 17, 2019 11:07 am
SV Access refractors

Last post by Lady Fraktor « Sat Aug 17, 2019 5:23 am
Replies: 12
by notFritzArgelander » Tue Aug 06, 2019 2:42 am

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Apparently a few are available at good prices.

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Where is the new arrival?? :)

Yay! You're back!

Limited amounts of time but yes :)

12 Replies

180 Views

Last post by Lady Fraktor
Sat Aug 17, 2019 5:23 am
Terrascope

Last post by Unitron48 « Tue Aug 13, 2019 12:29 pm
Replies: 5
by seer » Tue Aug 13, 2019 1:36 am

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This is an interesting video.

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Intriguing concept...will be interesting to see where it goes.

Dave

5 Replies

70 Views

Last post by Unitron48
Tue Aug 13, 2019 12:29 pm
three vendors same apparent scope

Last post by dghent « Wed Jul 24, 2019 7:28 pm
Replies: 3
by notFritzArgelander » Sat Jul 20, 2019 11:47 pm

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What's up? Is there an arbitrage opportunity here? :)

599 GBP converts to $748.90

545.38 EUR converts to $612.65

versus $775.

What am I...

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Rebranding of the same production models of telescopes and other items in the astronomy world is exceedingly common. Chinese telescopes are made by a...

3 Replies

110 Views

Last post by dghent
Wed Jul 24, 2019 7:28 pm
Refractor collimation

Last post by notFritzArgelander « Sat Jul 20, 2019 11:41 pm
Replies: 4
by Michael131313 » Sun Jun 09, 2019 5:13 pm

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I have an ES AR102. I bought a refractor collimating eyepiece from Agena, took the cross hairs out, removed the diagonal, inserted and adjusted to...

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Achromats can be a little bit more forgiving on the overall alignment than a apochromatic.

I'd be comfortable on DIY collimation with a doublet. I...

4 Replies

222 Views

Last post by notFritzArgelander
Sat Jul 20, 2019 11:41 pm
What could it be?

Last post by dagadget « Tue Jun 25, 2019 1:47 pm
Replies: 25
by Lady Fraktor » Mon May 27, 2019 10:53 pm
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The current 120mm run is complete, these are the last set of 120mm fluorite doublets from Agema Optics getting ready to be sent to the coating...

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Yes that 6 in refractor on the CGEM II mount really is very nice. It is my Globular Cluster and Planetary go to scope. The CPC 1100 is my DSO and...
25 Replies

729 Views

Last post by dagadget
Tue Jun 25, 2019 1:47 pm
APM 107 ..I can dream, right?

Last post by Lady Fraktor « Tue Jun 04, 2019 4:14 am
Replies: 6
by Kanadalainen » Tue May 28, 2019 4:55 pm

First post

Has anyone ever peeked through one of these? They appear to be very nice indeed.

Ian

Last post

The trick is to take nothing that can be used to access the banking account.

6 Replies

275 Views

Last post by Lady Fraktor
Tue Jun 04, 2019 4:14 am
Stellarvue 80 Lomo

Last post by Kanadalainen « Wed May 22, 2019 2:38 pm
Replies: 6
by Kanadalainen » Tue May 21, 2019 3:30 am

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Hello all,

Yesterday evening at a RASC star party, I had a chance to look through a nice Stellarvue 80 with Lomo glass. The owner (my friend Darren)...

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I have not had the opportunity to view through one of these older SV 80 but they seem to have a good reputation and sell used quite quickly.

:)...

6 Replies

226 Views

Last post by Kanadalainen
Wed May 22, 2019 2:38 pm

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