Refractor type Telescopes

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

Last post by j.gardavsky « Mon Sep 30, 2019 8:35 pm
Replies: 11
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...

Last post

Hello all,

the different levels of correction in the refractors: achromatic - apochromatic - superachromatic are nicely visualized in the graph from...

11 Replies

1165 Views

Last post by j.gardavsky
Mon Sep 30, 2019 8:35 pm
TMB/LZOS 152 F7.9 followed me home.....

Last post by Rainmaker « Wed Oct 23, 2019 6:23 am
Replies: 4
by Rainmaker » Tue Oct 22, 2019 8:03 am

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and my dear wife said I could keep it as long as I cleaned after it.....

After lots of negotiations recently, a friend finally agreed to my...

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Thanks everyone, this has been a scope I have thought about for years but it has been too expensive to buy new and too elusive to find pre-loved...

4 Replies

64 Views

Last post by Rainmaker
Wed Oct 23, 2019 6:23 am
Telescope Focuser And Temperature Acclimationm

Last post by yobbo89 « Fri Oct 18, 2019 12:02 pm
Replies: 3
by Refractordude » Fri Oct 18, 2019 7:16 am

First post

Did a two day test on a way to quicken cool down time for my 120mm f8 refractor. Both days the inside temperature was around 75 degrees, and outside...

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Cooling fans is the way to go, but many don't want to modify thier ota,s, other then that just keep busy for 30 mins.

3 Replies

79 Views

Last post by yobbo89
Fri Oct 18, 2019 12:02 pm
Skywatcher EvoStar DS Pro vs Altair Starwave? Which one?

Last post by Jaq1967 « Sun Oct 13, 2019 11:16 am

by Jaq1967 » Sun Oct 13, 2019 11:16 am

Hello all,

I'm still on the hunt to buy my first imaging refractor. My budget won't be to excessive and will need a few bits and bob's to get it up...

0 Replies

76 Views

Last post by Jaq1967
Sun Oct 13, 2019 11:16 am
Triplet Refractor Palooza Sale

Last post by Refractordude « Mon Oct 07, 2019 8:44 pm

by Refractordude » Mon Oct 07, 2019 8:44 pm

0 Replies

112 Views

Last post by Refractordude
Mon Oct 07, 2019 8:44 pm
About Baffles

Last post by j.gardavsky « Mon Oct 07, 2019 7:44 pm
Replies: 18
by Michael131313 » Fri Oct 04, 2019 11:10 pm

First post

I have read Gabby's post on baffles and the various links provided. I have a general idea on what they do, but would like to ask some basic...

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zenit(h) diagonal mirror

It is an unword , something like make the right angle right in the fun video.
Another unword is zenit(h) prism diagonal ,...

18 Replies

287 Views

Last post by j.gardavsky
Mon Oct 07, 2019 7:44 pm
My Celestron 150mm f/8

Last post by Lady Fraktor « Fri Oct 04, 2019 6:38 pm
Replies: 15
by Lady Fraktor » Sat Sep 28, 2019 4:55 am

First post

Synta 150mm f/8 Refractor

The short tube version seems to be getting popular of late so some thoughts on my refractor.

The Synta yard cannon, sold...

Last post

I carry my telescope down the stairs over my shoulder, mind it weights 13.5kg now.

I was going to comment that the stock OTA seems relatively...

15 Replies

260 Views

Last post by Lady Fraktor
Fri Oct 04, 2019 6:38 pm
Tube interior blackening and baffling

Last post by OzEclipse « Wed Oct 02, 2019 6:15 am
Replies: 51
by Lady Fraktor » Wed Sep 25, 2019 7:01 pm
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2

3
First post

A thought occurred to me from a comment one of our members either here or at AF made in a past posting.

The comment that the member made was that...

Last post

Gabby

You can try one made out of some thin black card & an elastic band to test it out before investing time into a metal build.

Joe
51 Replies

700 Views

Last post by OzEclipse
Wed Oct 02, 2019 6:15 am
150mm achro doublets. f/8, f/6.5, f/5

Last post by Bigzmey « Mon Sep 30, 2019 7:35 pm
Replies: 6
by Don Quixote » Sat Sep 28, 2019 9:42 pm

First post

I am interested in a discussion on the following:

The comparison of visual effectiveness of the following three 150mm refractor telescopes of f/5,...

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Thank you Andrey for participating here with your good experience and recommendations.

So far my experience on my AR152 f/6.5 has been limited to...

6 Replies

161 Views

Last post by Bigzmey
Mon Sep 30, 2019 7:35 pm
100th post on CN

Last post by DeanD « Sun Sep 29, 2019 12:48 am
Replies: 20
by Bigzmey » Thu Sep 26, 2019 10:43 pm
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2
First post

Yep, took me only 4 years to get there. More importantly the topic of the thread is

why would anyone want to drop $2K on a 4 apo for visual??? A 6...

Last post

The forums are platforms for exchange (of ...)
They have their sociology structure with the participants having different intentions, ...

In one of...
20 Replies

324 Views

Last post by DeanD
Sun Sep 29, 2019 12:48 am
Bringing scope in from cold

Last post by Lady Fraktor « Mon Sep 16, 2019 8:07 pm
Replies: 18
by starfield » Sat Sep 14, 2019 4:15 pm

First post

Hi all,

I'm a new refractor owner and had a question about dew. When I bring my refractor inside, I typically leave the cover off to let things dry...

Last post

When next at the druggist, ask them what they do with their desiccant packs that are in medicinal shipping boxes.
It is the really good grade,...

18 Replies

335 Views

Last post by Lady Fraktor
Mon Sep 16, 2019 8:07 pm
Some testing with my 150mm F5

Last post by John Baars « Sun Sep 08, 2019 9:48 am
Replies: 4
by John Baars » Fri Aug 30, 2019 9:55 am

First post

I did some startesting with my newly arrived 150 mm f/5, the 1.25 Zeiss prism and the 1.25 Baader BBHS diagonal mirror. Goal was to establish if the...

Last post

Since some questions were asked about the performance of the 6 inch f/5 on another Forum, I posted some pics there which I won't withhold here.
In...

4 Replies

280 Views

Last post by John Baars
Sun Sep 08, 2019 9:48 am
Orion 80ED

Last post by notFritzArgelander « Fri Sep 06, 2019 9:28 pm
Replies: 7
by Ylem » Sun Sep 01, 2019 1:40 am

First post

:telescopewink:
Hey all, I have been eyeing this thing for years. At $449. it seems like a good buy, for years it was 499, and even 525. With...

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Oh! I have the ST80 too. The Orion 80ED will complement it nicely. It takes high magnification much better on the Moon and double stars gives better...

7 Replies

179 Views

Last post by notFritzArgelander
Fri Sep 06, 2019 9:28 pm
What could it be?

Last post by John Baars « Mon Sep 02, 2019 8:58 pm
Replies: 27
by Lady Fraktor » Mon May 27, 2019 10:53 pm
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2
First post

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...

Last post

The last set..
Hmmmm pity, I was just looking for a pair of lenses for binoculars.
27 Replies

1097 Views

Last post by John Baars
Mon Sep 02, 2019 8:58 pm
150 mm f/5 Achromat just arrived.

Last post by Ylem « Sun Sep 01, 2019 5:12 pm
Replies: 10
by John Baars » Tue Aug 27, 2019 9:06 pm

First post

This evening my 150mm Skytraveller arrived. I spent the evening re-arranging accessoires. And I made a finder on it.
The evening was not clear, I had...

Last post

Wow! That's a big boy!!

ST80 on steroids!! :)

:Angry Orc:

10 Replies

269 Views

Last post by Ylem
Sun Sep 01, 2019 5:12 pm
Skywatcher 80ED Pro or 100ED Pro?

Last post by Jaq1967 « Wed Aug 28, 2019 7:28 am
Replies: 3
by Jaq1967 » Mon Aug 26, 2019 11:06 am

First post

Hello,

I am in the market for a Refractor for both visual and AP purposes, planetary and DSO. I currently have a Skywatcher Skymax 127, as well as...

Last post

I agree with Jerry here. Although I am not an AP guy I think that of the scopes you are looking at here the 100 is quite versatile. If it comes with...

3 Replies

168 Views

Last post by Jaq1967
Wed Aug 28, 2019 7:28 am
Tele Vue APO Design and Build “Secrets”

Last post by DeanD « Fri Aug 23, 2019 12:48 pm
Replies: 12
by KingClinton » Wed Aug 21, 2019 9:19 am

12 Replies

327 Views

Last post by DeanD
Fri Aug 23, 2019 12:48 pm
Got a new 6 inch this morning.

Last post by Refractordude « Wed Aug 21, 2019 6:41 pm
Replies: 30
by Don Quixote » Fri Aug 16, 2019 7:42 pm
1

2
First post

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...

Last post

Nice
30 Replies

547 Views

Last post by Refractordude
Wed Aug 21, 2019 6:41 pm
SV Access refractors

Last post by notFritzArgelander « Tue Aug 20, 2019 7:18 pm
Replies: 18
by notFritzArgelander » Tue Aug 06, 2019 2:42 am

First post

Apparently a few are available at good prices.

Last post

I've been dithering. I know... I know... he who hesitates is lost....

Nevertheless before my rather sudden retirement I had an SV 125ED Access on...

18 Replies

439 Views

Last post by notFritzArgelander
Tue Aug 20, 2019 7:18 pm
Terrascope

Last post by seer « Sun Aug 18, 2019 7:38 pm
Replies: 9
by seer » Tue Aug 13, 2019 1:36 am

First post

This is an interesting video.

Last post

Yes with Aricebo it's the receiver that is reflected on in the center moves right and there are several mercury telescopes in existence.

9 Replies

264 Views

Last post by seer
Sun Aug 18, 2019 7:38 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

First post

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

AH $2850. Missed it first read through.

Last post

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

219 Views

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

First post

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...

Last post

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

211 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

First post

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...

Last post

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

333 Views

Last post by notFritzArgelander
Sat Jul 20, 2019 11:41 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

415 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

First post

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)...

Last post

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

340 Views

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

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