Catadioptric telescopes

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My cats photo

Last post by JayTee « Sun Jul 21, 2024 9:16 pm
Replies: 8
by Bigzmey » Mon Nov 22, 2021 11:04 pm

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I have been talking for a couple of months about Maksutov-Cassegrains and how they compare to other types of catadioptric telescopes. I guess my...

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I feel it's time to engineer and construct a new optical device whose name shall be the Direct Optical Galactic Surveyor. (DOGS) It's about time we...

8 Replies

6193 Views

Last post by JayTee
Sun Jul 21, 2024 9:16 pm
Down to Two,(I think...)

Last post by hosshead « Thu Jan 25, 2024 1:35 am
Replies: 25
by hosshead » Wed Jan 17, 2024 3:29 pm
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2
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...yeah, I have been away for a bit doing a couple interviews with NWS now that school is out, but also have been researching scope choices.
I am...

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Thank you so much!
It's definitely going to be some sort of GEM.
The physics are obviously better.
I really super appreciate your input!
25 Replies

4140 Views

Last post by hosshead
Thu Jan 25, 2024 1:35 am
Can somebody PLEEEZE explain why the orange tube C8 is such a big deal?

Last post by OzEclipse « Wed Jan 03, 2024 7:42 am
Replies: 17
by hosshead » Thu Dec 28, 2023 5:15 pm

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... because I really REALLY want to know!
Yes, we know I am a superNewbie here and to shopping for telescopes.
And I see plenty of listings for...

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so will a 12 inch newt see colour as well as the edge hd even the 8 ?
Or is this not accurate?

As JT already mentioned. Forget about seeing color...

17 Replies

2682 Views

Last post by OzEclipse
Wed Jan 03, 2024 7:42 am
Sharpstar SCA260 V2

Last post by JayTee « Mon Oct 30, 2023 11:36 pm
Replies: 11
by ScottFwashere » Wed Dec 14, 2022 6:05 pm

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Hi,
I was wondering if anyone has any experience or comments on this scope. I'm debating between it and a 10 Richey-Chretien for my next scope. The...

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What is the difference between V2.0 and V2.1. Thanks!
From the Agena Astro website:

Important note about v2 and v2.1 of this scope:

Sharpstar...

11 Replies

3694 Views

Last post by JayTee
Mon Oct 30, 2023 11:36 pm
SW 150 mac / cass

Last post by Gordon « Sat Sep 30, 2023 1:37 am
Replies: 21
by Gordon » Wed Sep 20, 2023 7:22 pm
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2
First post

I just ordered a SkyWatcher Skymax 150 along with a ZWO eaf and the corresponding bracket.

This is my first step into the world of long focal...

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I can’t blame it on the EAF, as I was still testing and hadn’t used it remotely.
21 Replies

3348 Views

Last post by Gordon
Sat Sep 30, 2023 1:37 am
Original BJ scope can it be saved?

Last post by Lady Fraktor « Tue Aug 08, 2023 7:15 pm
Replies: 5
by Richard » Wed Aug 02, 2023 2:37 pm

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I think this is the proper BJ scope that most fear , I have never used one where the corrector is the front lens
This one the front lens is broken ,...

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I may be wrong but looking online it seems the glass plate is not a actual corrector but plate glass to hold the secondary.
Making a single stalk to...

5 Replies

1544 Views

Last post by Lady Fraktor
Tue Aug 08, 2023 7:15 pm
Colimación maksutov Maxvision idéntico al Bresser 152/1900

Last post by lunaluser « Sat May 20, 2023 11:45 pm
Replies: 10
by lunaluser » Sun Apr 09, 2023 6:39 pm

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Hola, buenas tardes. respecto a mi telescopio Maxvision idéntico al Bresser 152/1900 Maksutov, sigo sin poder colimarlo bien. Algún miembro de este...

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Hola Ricardo, buenas noches, cuando lo desenbale en su momento me di cuenta que la caja venia maltratada, me imagino que el viaje desde China a...

10 Replies

3418 Views

Last post by lunaluser
Sat May 20, 2023 11:45 pm
SkyWatcher 180mm Mak mods

Last post by Bigzmey « Sun Apr 30, 2023 2:52 am
Replies: 13
by Bigzmey » Thu Dec 02, 2021 12:45 am

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I have recently added SkyWatcher 180mm Mak to my stable. Optically it exceeded my expectations in particular on planets.
See the first light report...

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I don't cover the back, seems to work fine.

13 Replies

12058 Views

Last post by Bigzmey
Sun Apr 30, 2023 2:52 am
C8 CG5 OTA Discontinued!?

Last post by Bigzmey « Thu Feb 02, 2023 1:58 am
Replies: 10
by Ylem » Thu Jan 26, 2023 4:25 pm

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I was considering replacing the C6 that rides on my SE with an 8 or deforking the Celestar (which I don't really want to do).

But it appears it has...

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Yes, I was aware the CGE model was always available, just the CG5/Vixen was discontinued.

I just always assumed (as a visual only observer) that the...

10 Replies

2871 Views

Last post by Bigzmey
Thu Feb 02, 2023 1:58 am
Ronchi Mirror Spacing

Last post by DMouse « Sun Jul 17, 2022 2:34 pm
Replies: 2
by DMouse » Tue Jul 05, 2022 9:06 pm

First post

Hi, I am having some issues with my 12 inch RC, the images are a little fuzzy. I have ordered a Ronchi grating eyepiece as this will show if the...

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Thanks for the reply John. In have been using the Howie Glatter laser collimator for initial setup and then using my camera to do the DSI method. As...

2 Replies

2156 Views

Last post by DMouse
Sun Jul 17, 2022 2:34 pm
What a find and what a price!

Last post by Ylem « Wed Apr 06, 2022 3:56 pm
Replies: 2
by Barnacle » Wed Apr 06, 2022 12:16 pm

First post

APM Maksutov Cassegrain Telescope 20 Inch (500 mm) F/8.5 (Focal Length 4250 MM) at a jaw-dropping AU $170,763.12!

For those who strike it rich in...

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I need to sell some of my NFTs :lol:

2 Replies

2373 Views

Last post by Ylem
Wed Apr 06, 2022 3:56 pm
New Cat Coming!

Last post by Thefatkitty « Thu Mar 03, 2022 1:40 am
Replies: 15
by Ylem » Mon Feb 28, 2022 8:15 pm

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I was looking at refractors, but realized my herd was missing a C5!
I found a brand new one in a small NJ camera store. It should be here Wednesday...

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Good for you Jeff; I was hoping that would show up for you today!

So, how's the weather...? ;)

They rolled in about two hours after delivery...

15 Replies

4330 Views

Last post by Thefatkitty
Thu Mar 03, 2022 1:40 am
Whuh??

Last post by Bigzmey « Sun Feb 20, 2022 5:59 pm
Replies: 6
by pakarinen » Sat Feb 19, 2022 6:01 pm

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Was taking some pics of my 90 Mak in case I decided to sell it and noticed spots on the corrector. I don't know when that happened or what it is....

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I use Zeiss wipes, for small jobs like this.

What Gabby says. :)

6 Replies

2985 Views

Last post by Bigzmey
Sun Feb 20, 2022 5:59 pm
6" RC - Gonna give it another try...

Last post by notFritzArgelander « Mon Feb 07, 2022 7:51 pm
Replies: 1
by a100171 » Mon Feb 07, 2022 7:34 pm

First post

I haven't been out as much as I should, but managed to get a few pieces of equipment out there to make sure all is good.
I fired-up a Meade DS2090...

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Best of luck!

1 Replies

2579 Views

Last post by notFritzArgelander
Mon Feb 07, 2022 7:51 pm
Takahashi 180mm Mewlon vs Synta Mak

Last post by OzEclipse « Sat Nov 20, 2021 9:21 pm
Replies: 5
by Bigzmey » Wed Nov 17, 2021 8:16 pm

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As you know astronomy vendors experiencing major supply chain issues with lead time for most of good quality scopes approaching one year. On top of...

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I can't give you a comparion between the two scopes. I've heard good things about the SW Mak but never seen through one. That said, two of my friends...

5 Replies

6444 Views

Last post by OzEclipse
Sat Nov 20, 2021 9:21 pm
New to me iOptron 150mm Mak

Last post by Makuser « Thu Nov 11, 2021 2:17 pm
Replies: 7
by Bigzmey » Wed Nov 10, 2021 2:11 am

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Thanks to generosity of Mark (John Donne) in memory of late Henry (Hankmeister3) I am a proud owner of iOptron 150mm Maksutov-Cassegrain!...

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Hi Andrey. Congratulations on receiving the iOptron 150mm Rumak telescope from Mark which was part of Henry's legacy. And you and nFA did a nice...

7 Replies

7295 Views

Last post by Makuser
Thu Nov 11, 2021 2:17 pm
Meade LX200 Microfocuser

Last post by John Baars « Sat Oct 23, 2021 4:07 pm
Replies: 8
by sdbodin » Tue Apr 13, 2021 8:26 pm

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I have been chasing a bit of an alignment error for some time and found the culprit. The microfocuser was miss-aligned by a couple degrees!! I think...

Last post

I just did a star test on Polaris. The verdict? low power (40mm) showed a perfect donut. High power (9mm) showed a perfect donut. However, at 9MM...

8 Replies

6573 Views

Last post by John Baars
Sat Oct 23, 2021 4:07 pm
12" Meade LX200 OTA Only

Last post by AstroBee « Wed Sep 01, 2021 7:31 pm
Replies: 5
by AstroBee » Wed Sep 01, 2021 3:45 am

First post

Does anyone have an idea what a fair price would be to ask for a 12 Meade OTA only. It has a moonlight focuser (no motor) and top and bottom...

Last post

Thanks Bigzmey

5 Replies

5288 Views

Last post by AstroBee
Wed Sep 01, 2021 7:31 pm
Collimation problem on SCT

Last post by andy brown « Thu Jun 17, 2021 5:26 pm
Replies: 11
by Piet Le Roux » Mon Sep 21, 2020 9:45 am

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I wonder if anybody has had the same problem with their SCT : I have a 8” Meade LX90ACF of which the collimation differs from one side of focus to...

Last post

I wonder if anybody has had the same problem with their SCT : I have a 8” Meade LX90ACF of which the collimation differs from one side of focus to...

11 Replies

11471 Views

Last post by andy brown
Thu Jun 17, 2021 5:26 pm
a little meade tlc

Last post by yobbo89 « Fri Jun 04, 2021 5:28 pm
Replies: 3
by yobbo89 » Tue Apr 20, 2021 7:41 pm

First post

I think i've sorted out the mirror flop, seems like the clamp ring under ther geared mirror lock may of been a little too big, i cut it down 5 mm...

Last post

Please excuse my ignorance, but what are the teeth for?

Good work getting in there! Did you use a circular or square easy out?

i just used a...

3 Replies

4973 Views

Last post by yobbo89
Fri Jun 04, 2021 5:28 pm
8" Celestron 8SE or Orion SkyQuest XT10i IntelliScope?

Last post by Richard « Fri Jun 04, 2021 3:34 pm
Replies: 11
by Power Ranger » Sun Oct 25, 2020 6:19 pm

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After 20 years, I sold my Celestron Nexstar 5i. Now shopping for a new scope, I've narrowed it down to either the Nexstar 8SE or a 10 Orion SkyQuest...

Last post

Mine 8 inch GSO has a duel speed and the 10 inch skywatcher only a single but for visual both work about the same both are the toothless wonders , I...

11 Replies

10683 Views

Last post by Richard
Fri Jun 04, 2021 3:34 pm
OTA Humidity

Last post by andy brown « Fri Jun 04, 2021 1:15 pm
Replies: 8
by Graeme1858 » Sat Feb 20, 2021 9:03 pm

First post

My corrector plate has been misting up on the inside in use! I keep the telescope in a Celestron case in the garage and put it away after a session...

Last post

I also have a bag of desiccant in the focuser/drawtube.

8 Replies

8005 Views

Last post by andy brown
Fri Jun 04, 2021 1:15 pm
Meade 16" acting flaky

Last post by andy brown « Fri Jun 04, 2021 1:10 pm
Replies: 6
by Ben Cartwright SASS » Fri Apr 09, 2021 8:13 pm

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Our club has a 16 and a 12 LX200 Classic. I think the hand controller on the 16 is flaky, it moves the scope fine until it gets pointed at the zenith...

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Can you check for continuity of the cable in different positions? Maybe one of the wire connections is getting worn.

Or corroded contacts maybe?

6 Replies

6421 Views

Last post by andy brown
Fri Jun 04, 2021 1:10 pm
Fluid head for baby Mak?

Last post by pakarinen « Sun Apr 25, 2021 12:36 pm
Replies: 6
by pakarinen » Sat Apr 24, 2021 2:41 pm

First post

A nice thing about my 90mm Mak is it's very light weight. It rides well on my friction pan head, but manual slo-mo difficult - hard to avoid jerking...

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I also have been looking for a good one for my 90mm Mak and ST80.

My ST80 is my usual travel scope, so dual use would be good.

6 Replies

5839 Views

Last post by pakarinen
Sun Apr 25, 2021 12:36 pm
Guide Scope Mount Finally Arrived.......

Last post by Kerry C. « Tue Mar 23, 2021 2:02 am
Replies: 2
by SMPhotography » Sun Mar 21, 2021 10:47 pm

First post

Now if the cloud cover would only clear. According to Astrospheric.com, the clouds will not dissipate for another week.

Last post

What's the focal length of the guidescope and imaging rig?
I thought most folks that are imaging with long FL SCT are using OAG's to guide with....

2 Replies

4867 Views

Last post by Kerry C.
Tue Mar 23, 2021 2:02 am

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Catadioptric telescopes

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