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...

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Hello all,

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

11 Replies

2213 Views

Last post by j.gardavsky
Mon Sep 30, 2019 8:35 pm
Refractor Photo Thread (everyone loves pictures)

Last post by Rainmaker « Tue Dec 10, 2019 4:06 am
Replies: 1
by Rainmaker » Tue Dec 10, 2019 12:34 am

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:observer: Here is a place to post some pictures of your refractors :observer:

My recent arrival (still waiting for the mounting hardware):...

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and the Big Brother:

TMB-LZOS 152mm F7.9 @1200mm

1 Replies

118 Views

Last post by Rainmaker
Tue Dec 10, 2019 4:06 am
Say hello to my little friend!

Last post by MartinF « Thu Dec 05, 2019 8:58 pm
Replies: 8
by MartinF » Sat Nov 16, 2019 7:04 pm

First post

So happy right now! Managed to get hold of a TS-Optics 80mm f/6 triplet APO with a lot of accessories for a REALLY good price (used). Can´t wait to...

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OK, so here is the first post with data from the new scope :)

8 Replies

363 Views

Last post by MartinF
Thu Dec 05, 2019 8:58 pm
requirements for a gift. recommendations?

Last post by notFritzArgelander « Tue Dec 03, 2019 6:38 pm
Replies: 17
by notFritzArgelander » Mon Nov 25, 2019 12:40 am

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I've finally managed to negotiate a set of requirements for a 2nd telescope for a grandson. The first telescope was a Vixen Nature Eye which was...

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I took delivery yesterday. Naturally the weather was dismal. However I have begun the seduction of the neighbor dog so that I can come and go...

17 Replies

423 Views

Last post by notFritzArgelander
Tue Dec 03, 2019 6:38 pm
Beginner looking for £200/£250 telescope

Last post by Bigzmey « Mon Nov 25, 2019 10:50 pm
Replies: 3
by samavfc123 » Mon Nov 25, 2019 2:31 pm

First post

Hi,

Been looking for ages for a telescope within my £200 budget and been struggling. i found these teelscopes:

Celestron 31051 AstroMaster 130EQ...

Last post

Between the two scopes you have selected SkyWatcher has better optics. However, I believe it is too large for the mount they bundle it. I suggest...

3 Replies

119 Views

Last post by Bigzmey
Mon Nov 25, 2019 10:50 pm
How Do I Fix This?

Last post by Refractordude « Mon Nov 25, 2019 4:34 am
Replies: 12
by Refractordude » Wed Nov 20, 2019 5:40 pm

First post

A screw or whatever came out of the focuser tube. All is fine, the telescope is still very usable. The scope is a Meade LX70 120mm f8. What type/size...

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Thanks for all the advice

12 Replies

300 Views

Last post by Refractordude
Mon Nov 25, 2019 4:34 am
Horse Tradin'

Last post by bladekeeper « Mon Nov 25, 2019 3:16 am
Replies: 17
by bladekeeper » Tue Nov 19, 2019 1:51 am

First post

Day 3 of my 9-Days Off from Work. I am still checking my work email but I'm not answering any of it. I can't or I violate my 9-days out. :D

Anyway,...

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Congratulations Bryan - Good Tradin'
Looking forward to the captures you'll get with it.
How do you like the L-enhance?

Thanks, Steve! :)

The...

17 Replies

403 Views

Last post by bladekeeper
Mon Nov 25, 2019 3:16 am
TMB/LZOS 152 F7.9 followed me home.....

Last post by Lady Fraktor « Sun Nov 24, 2019 5:18 am
Replies: 9
by Rainmaker » Tue Oct 22, 2019 8:03 am

First post

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...

Last post

Thank you Matt, that is what I thought.
Unfortunate, he made some really nice accessories.

9 Replies

371 Views

Last post by Lady Fraktor
Sun Nov 24, 2019 5:18 am
new telescope - are these markings bad?

Last post by j.gardavsky « Sat Nov 23, 2019 6:13 pm
Replies: 9
by Baskevo » Wed Nov 20, 2019 2:47 am

First post

Hey guys, I purchased the FCD100 80mm refractor from explore scientific, and the screws attaching the dovetail were stripped and it was lose (and I...

Last post

It is bad.
They have sent you another returned item, just my guess,

JG

9 Replies

307 Views

Last post by j.gardavsky
Sat Nov 23, 2019 6:13 pm
Another 150 f5 question...

Last post by DeanD « Tue Nov 19, 2019 12:21 am
Replies: 20
by DeanD » Sun Nov 10, 2019 4:19 am
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2
First post

To all you DYI'ers out there: when I get the new focuser for the scope (as per my previous topic) I was thinking of doing a couple of other things:...

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Update on the binoviewer: it works with the new focuser! That 35mm shorter length compared with the original focuser makes all the difference:...
20 Replies

592 Views

Last post by DeanD
Tue Nov 19, 2019 12:21 am
Should A Refractor Be Called A Reflector?

Last post by j.gardavsky « Fri Nov 15, 2019 7:55 pm
Replies: 17
by Refractordude » Mon Nov 11, 2019 8:05 pm

First post

With the use of a diagonal, I think so. The diagonal REFLECTS light into the eyepiece.

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My Newtonian is a catadioptric, because it really doesn't work properly without a coma corrector.

Kathy,
and when it makes spikes around the...

17 Replies

512 Views

Last post by j.gardavsky
Fri Nov 15, 2019 7:55 pm
Telescope Focuser And Temperature Acclimationm

Last post by Thefatkitty « Fri Nov 15, 2019 5:47 pm
Replies: 8
by Refractordude » Fri Oct 18, 2019 7:16 am

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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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I would say just giving it time outside. My 10 lives outside in the shed all covered, so it's always acclimatized :D The fracs live in the basement,...

8 Replies

324 Views

Last post by Thefatkitty
Fri Nov 15, 2019 5:47 pm
Got a new 6 inch this morning.

Last post by Don Quixote « Mon Nov 11, 2019 2:23 am
Replies: 34
by Don Quixote » Fri Aug 16, 2019 7:42 pm
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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

Congrats Mark! It should be a beast on DSOs. What mount you are putting it on? I like your group photo. I should do one like this. :)

Hi Andrey....
34 Replies

1004 Views

Last post by Don Quixote
Mon Nov 11, 2019 2:23 am
Finder attachment for 150mm f5?

Last post by OzEclipse « Sun Nov 10, 2019 6:13 am
Replies: 12
by DeanD » Wed Nov 06, 2019 4:54 am

First post

Hi Folks,

I am considering getting a replacement GSO 10:1 crayford focuser for my Celestron XLT 150mm f5 achromat, but one issue is that the stock...

Last post

I have ordered one, thanks! Hopefully it will arrive quicker than my last order from China. I am still waiting on that one from February!

I...

12 Replies

340 Views

Last post by OzEclipse
Sun Nov 10, 2019 6:13 am
If you insist, they will push the buttons for you.....

Last post by bladekeeper « Sat Nov 09, 2019 11:57 pm
Replies: 19
by John Baars » Wed Nov 06, 2019 11:37 am

First post

Nice Christmas present if you have a money tree in your backyard.
Have a look at the video

I am afraid they overlooked one charasteristic of us...

Last post

To quote Wayne from Letterkenny :

It's a hard life pickin' stones and pullin' teats...

Wait, wrong quote.

Let's see...ah yes!

Hard no.

19 Replies

443 Views

Last post by bladekeeper
Sat Nov 09, 2019 11:57 pm
iStar Apos...

Last post by DeanD « Wed Nov 06, 2019 6:51 am
Replies: 4
by DeanD » Wed Nov 06, 2019 5:02 am

First post

For all you ATM-ers out there who want to make an Apo refractor: iStar is starting to produce 140mm triplet and 160mm ED doublet lens assemblies:

I...

Last post

I need to figure out how to get listed as a research center to get the discount!
Thank you for the link Dean. :)

Its might be easier to become an...

4 Replies

141 Views

Last post by DeanD
Wed Nov 06, 2019 6:51 am
150mm achro doublets. f/8, f/6.5, f/5

Last post by Don Quixote « Wed Nov 06, 2019 5:25 am
Replies: 13
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,...

Last post

Thank you JG for coming in on this.

With my f/6.5 I have good visual focus with very little color fringing. On the moon tonight at 78X with 12.5...

13 Replies

542 Views

Last post by Don Quixote
Wed Nov 06, 2019 5:25 am
Bringing scope in from cold

Last post by stewe « Sun Nov 03, 2019 11:54 am
Replies: 21
by starfield » Sat Sep 14, 2019 4:15 pm
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2
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

How about leaving dust caps on as Kathy suggested (if the lens did not become dewy already outside anyway), then using a hair dryer and dew heater...
21 Replies

713 Views

Last post by stewe
Sun Nov 03, 2019 11:54 am
Skywatcher EvoStar DS Pro vs Altair Starwave? Which one?

Last post by yobbo89 « Sun Nov 03, 2019 4:50 am
Replies: 4
by Jaq1967 » Sun Oct 13, 2019 11:16 am

First post

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...

Last post

forget any high resolution planetary imaging, you'll most likely achieve wide shot low detail images..big glass and long focal lengths is the only...

4 Replies

232 Views

Last post by yobbo89
Sun Nov 03, 2019 4:50 am
Tube interior blackening and baffling

Last post by Apollo69s « Fri Oct 25, 2019 1:17 am
Replies: 52
by Lady Fraktor » Wed Sep 25, 2019 7:01 pm
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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

Ive go 2 big in my Bresser approxomaly 1/3 into the scope its sticking about 1 cm from the tube wall into the scope ,and the 2nd is in the 2nd off...
52 Replies

1428 Views

Last post by Apollo69s
Fri Oct 25, 2019 1:17 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

172 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...

Last post

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

540 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

427 Views

Last post by Lady Fraktor
Fri Oct 04, 2019 6:38 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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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

554 Views

Last post by DeanD
Sun Sep 29, 2019 12:48 am
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

382 Views

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

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