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Equipment Discussions >> Classic Telescopes

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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
my new(?) Criterion RV-6
      #6141756 - 10/16/13 08:40 PM Attachment (34 downloads)

Well, after over a year of lurking in the Classic Telescope forum, I bid on and won a RV-6. I bid because it was almost local and it was cheep (under $90). I picked it up on Monday and on Tuesday started planning my first restoration. I do have an old Sears 60mm refractor but haven't used it much. The next oldest scope I have is a orange C8 from the mid 70's.

I'll be looking over some other threads about restoration of the RV-6 and working on it over the next few weeks. It is in surprisingly good shape. I haven't removed the primary yet but it looks great gazing down the tube.

I couldn't wait to complete the restoration for first light so I mounted he rings on a Vixen dovetail and mounted it on my iOptron zEQ25 to give it a try tonight. I was completely blown away! Views of the Moon are the best I've seen with ANY scope (250X). Took a quick look at Venus which was fairly low in the Southwest and M31 which was nice and high. The best I've seen either of those without a camera.

I mainly bought the RV-6 to clean it up and sell it... after one quick session, I think I'll keep it. I may leave it mounted on a modern mount, but the OTA is a keeper. The only issue I have to address now is that the collimation is so good that I HATE the thought of taking the mirrors and focuser off to repaint it. I think I may just keep it like it is, warts and all.


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turk123
Pooh-Bah
*****

Reged: 07/09/10

Loc: N.E. Ohio
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6141784 - 10/16/13 08:54 PM

Hi Mike

I wouldn't be afraid of breaking it down to restore it. Sooner or later you will need to know how to collimate a scope. We can help you do that (with a laser or two) but I would not fear the unknown. It is not that hard and you already know what you need to get it back to. Collimation should be something every good classic scope collector needs to know. You might as well learn that technique now.

Nice scope by the way!


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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: turk123]
      #6141811 - 10/16/13 09:06 PM

Quote:

Hi Mike

I wouldn't be afraid of breaking it down to restore it. Sooner or later you will need to know how to collimate a scope. We can help you do that (with a laser or two) but I would not fear the unknown. It is not that hard and you already know what you need to get it back to. Collimation should be something every good classic scope collector needs to know. You might as well learn that technique now.

Nice scope by the way!




I know you are right, I need to learn how. Well, if I get stuck, I'm in central Indiana, maybe I can get you to come down and help.

Mike


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turk123
Pooh-Bah
*****

Reged: 07/09/10

Loc: N.E. Ohio
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6141828 - 10/16/13 09:15 PM

When you pull the main cell, just mark it's orientation. Same with the secondary. Tape one of the vains and write down which hole it goes to. That will save you some time.

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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: turk123]
      #6141835 - 10/16/13 09:18 PM

Thanks for the tips. I'll use it a couple of nights and then year into it.

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bremms
Carpal Tunnel
*****

Reged: 08/31/12

Loc: SC
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6141849 - 10/16/13 09:30 PM

That looks nice. I would clean it up and use it as original. Original nice condition is better than fully restored to me.

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terraclarke
Post Laureate
*****

Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: my new(?) Criterion RV-6 new [Re: bremms]
      #6141943 - 10/16/13 10:16 PM

I agree. It has character. Clean it, lube and tighten things up, fix anything that's broken and keep its character.

Nice find Mike.


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youngamateur42
Pooh-Bah
*****

Reged: 11/21/12

Loc: La Verne, CA
Re: my new(?) Criterion RV-6 new [Re: terraclarke]
      #6141972 - 10/16/13 10:28 PM Attachment (11 downloads)

A great scope you've got there, I wouldn't restore it. But I would take it all apart, give it a thorough cleaning, and re assemble. The collimation on these are pretty easy. The mirror cell is adjusted by three nuts, I found these adequate but I eventually replaced them with wing-nuts and the motion is much smoother, collimation doesn't take more than a minute. The on thing that really makes these scopes shine is by replacing the fastners that hold the mirror cell and secondary spider to the tube (on the outside). It looks really sharp and I don't think it'll impact the originality of your scope, it's a gem, don't get rid of that, I have one, but I restored it. The scope you have has those awesome lunar lander legs

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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: terraclarke]
      #6142005 - 10/16/13 10:48 PM

Marc & Terra,

I think that sounds good. The RA drive doesn't appear to work and the neither axis will lock so the mount will need work. I'll tear into it soon. Event the paint on the OTA isn't all that bad. There is one chip about the size of a dime at the primary mirror end tha needs some attention.

Mike


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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: youngamateur42]
      #6142008 - 10/16/13 10:51 PM

Thanks Jason. I saw some of the post about your RV-6. Sure looks good - thanks for the tips. The only thing I see with the scope I don't like much is the focuser. I may need to add a modern one and keep the original around.

Mike


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Mr Magoo
Carpal Tunnel
*****

Reged: 11/05/05

Loc: Franklin, Indiana
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6142259 - 10/17/13 03:48 AM

Congrats on the RV-6 Mike. I own a RV-6 and a RV-8 that I've restored and I would be glad to help you with anything you need to do with them. I'm just down the road in Franklin, IN. I'm also a member of the Indiana Astronomical Society. If you have never heard of us or been out to visit, you should come see us. PM me for more info if you like and we would love to meet you.

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amicus sidera
Post Laureate
*****

Reged: 10/14/11

Loc: East of the Sun, West of the M...
Re: my new(?) Criterion RV-6 new [Re: Mr Magoo]
      #6142595 - 10/17/13 10:15 AM

That's a fine scope, Mike; I think that the longer you use it, the more you will like it. Criterion put some fine workmanship into those instruments; also, if there's a more archetypal amateur telescope than an RV-6, aside from perhaps a 4" Unitron, I'm unaware of it.

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terraclarke
Post Laureate
*****

Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Re: my new(?) Criterion RV-6 new [Re: amicus sidera]
      #6142693 - 10/17/13 11:00 AM

Quote:

That's a fine scope, Mike; I think that the longer you use it, the more you will like it. Criterion put some fine workmanship into those instruments; also, if there's a more archetypal amateur telescope than an RV-6, aside from perhaps a 4" Unitron, I'm unaware of it.




I would say that the 4 inch Unitron was the archetype- the subliminal driving image residing in the deep subconscious, linked to wants and desires, usually unfulfilled I might add, in the case of the big Uni.

The 6 inch F8 reflector, typified by the RV6 was the stereotype representing what most of us either had or could realistically aspire to have.

I'm just playing with you here Fred.


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greedyshark
professor emeritus
*****

Reged: 10/31/05

Loc: 3rd Rock
Re: my new(?) Criterion RV-6 new [Re: terraclarke]
      #6143040 - 10/17/13 02:09 PM

Nice find, Mike. Like Ken, I own both the RV-6 and 8. Simplicity in design combined with stunning optical performance.

Charles


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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: amicus sidera]
      #6143150 - 10/17/13 03:10 PM

Fred,

After one night out I can say I'm very impressed with the views. The seeing wasn't great last night but it still did a great job on the moon and Ok on Jupiter. It's a keeper. I'll need to rebuild the mount but other than that and some cleanup, I'll probably leave it as it. I can't believe how lite it is.

Mike


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dgreyson
professor emeritus
*****

Reged: 11/06/12

Loc: South Carolina
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6143721 - 10/17/13 08:53 PM

definitely a keeper.

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Gil V
sage


Reged: 09/09/12

Re: my new(?) Criterion RV-6 new [Re: dgreyson]
      #6144779 - 10/18/13 12:21 PM

If you have any questions, ask away. I have a clutch and worm gear for an RV-6 that I'd be willing to part with if needed.

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A6Q6
sage


Reged: 05/31/11

Loc: Stroudsburg,Pa,U.S.A
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6145021 - 10/18/13 02:41 PM

Hi Mike, the RV-6 was a big part of my life back in the 70's. It impressed my brother-in-law on Saturn back then and that's saying a lot!

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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: Gil V]
      #6145026 - 10/18/13 02:43 PM

Quote:

If you have any questions, ask away. I have a clutch and worm gear for an RV-6 that I'd be willing to part with if needed.




Gil V,

Thanks for the offer. I'm going to get into the mount in a day or two and see what I find. After I get it taken apart I'll know better how it should work and what, if anything, is wrong. Need to pick up some cork gasket material as I assume that that, at least, needs replaced.

Mike


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Bonco
Post Laureate
*****

Reged: 04/17/06

Loc: Florida
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6148635 - 10/20/13 03:58 PM

Nice find! Cork is easy to find in craft shops. Remove the old cork and try to find replacement cork that is close to the smae thickness. Cork comes in a sheet and you'll need to use an exato blade or something similar to cut out a donut ring. Keek the old cork even if it's in pieces to make the replacement the same diminsions. For me the only difficult thing to remove on dissasembly is the spider. It's very easy to end up with bent vanes. I'd suggest you don't remove it unless absolutely necessary. Collimation of the RV6 can be done without any collimation devices. It's very tolerent of minor colimation errors. Good luck, Bill

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orion61

*****

Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: my new(?) Criterion RV-6 new [Re: Bonco]
      #6148746 - 10/20/13 05:31 PM

I still have my RV6, needs recoated now, I ground down my large Primary clips, so instead of about 6 or 8 defraction spikes I have 4 now and it has helped contrast. Don't be surprised if it gives that C8 a run for the Money on Planetary!
Larry Beach


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GeneT
Ely Kid
*****

Reged: 11/07/08

Loc: South Texas
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6148812 - 10/20/13 06:06 PM

A RV-6 is a true classic. Maybe think about keeping it.

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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: Bonco]
      #6148844 - 10/20/13 06:23 PM

Bill,

Thanks for the tips. My plan right now I'd to just clean up the tube not removing the spider or primary. Looking down the tube, the primary looks great. I just started getting into the mount. I am going to repaint the pier and mount, replace the cork if needed and re-grease it. I think that's about all I'll be doing.

Mike


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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: orion61]
      #6148857 - 10/20/13 06:28 PM

Quote:

I still have my RV6, needs recoated now, I ground down my large Primary clips, so instead of about 6 or 8 defraction spikes I have 4 now and it has helped contrast. Don't be surprised if it gives that C8 a run for the Money on Planetary!
Larry Beach




Larry,

You are right about the planetary performance. My C8 still needs collimated. Be only had it out 2 time since I got it back from you and neither time in good seeing. I do like the RV-6... it is a little long for me but on a short mount and tripod the eyepiece isn't in too bad a position. I used it on my iOptron z25 mount which is quite short. Looks funny on that little mount but does work well.

Mike


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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: GeneT]
      #6148874 - 10/20/13 06:36 PM

Quote:

A RV-6 is a true classic. Maybe think about keeping it.




Gene,

I'm real impressed with the performance on the Moon and some doubles I checked out the only night I have gotten it out. I rarely have a scope more than a year but this one could very well be a keeper. I'll continue using it on a modern mount. The iOptron zEQ25 I have is only about 3 feet tall (tripod and mount) and is a good size for the RV-6. I'll get use to the focuser. The only thing I'd like to change on the scope are the rings. I'd like to get some rotating rings. I am keeping everything as original as possible.


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orion61

*****

Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6148878 - 10/20/13 06:39 PM

They are a bit crude compared to some fancy Refractor scope but the performance is not crude by any means!

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greedyshark
professor emeritus
*****

Reged: 10/31/05

Loc: 3rd Rock
Re: my new(?) Criterion RV-6 new [Re: Mkofski]
      #6149896 - 10/21/13 01:31 PM

Quote:

Quote:

I still have my RV6, needs recoated now, I ground down my large Primary clips, so instead of about 6 or 8 defraction spikes I have 4 now and it has helped contrast. Don't be surprised if it gives that C8 a run for the Money on Planetary!
Larry Beach




Larry,

You are right about the planetary performance. My C8 still needs collimated. Be only had it out 2 time since I got it back from you and neither time in good seeing. I do like the RV-6... it is a little long for me but on a short mount and tripod the eyepiece isn't in too bad a position. I used it on my iOptron z25 mount which is quite short. Looks funny on that little mount but does work well.

Mike




Yep...RV-6 contrast should easily best a C8.

Charles


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Bonco
Post Laureate
*****

Reged: 04/17/06

Loc: Florida
Re: my new(?) Criterion RV-6 new [Re: greedyshark]
      #6150314 - 10/21/13 05:53 PM

After my purchase of the RV6 back in the day, my next purchase was a C8. I was not a happy camper and sent it back to Celestron for warranty check and collimation. When it came back, still the RV6 provided noticably better planetary views and cleaner star images. Sold the C8, still have the RV6. So optically the RV6 was superior, however the mechanics on the C8 were vastly superior. Go figure.
Bill


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Mkofski
Pooh-Bah
*****

Reged: 07/19/11

Loc: Greenfield, Indiana, USA
Re: my new(?) Criterion RV-6 new [Re: Bonco]
      #6150444 - 10/21/13 07:23 PM

Quote:

After my purchase of the RV6 back in the day, my next purchase was a C8. I was not a happy camper and sent it back to Celestron for warranty check and collimation. When it came back, still the RV6 provided noticably better planetary views and cleaner star images. Sold the C8, still have the RV6. So optically the RV6 was superior, however the mechanics on the C8 were vastly superior. Go figure.
Bill




Bill,

Size wise I sure do like the C8 but so far the RV-6 is a better performer. In fairness to the C8, I haven't had it out often and never when there was good seeing so it still needs collimation. The only problem I see with the RV-6 is it's length. With any wind I don't think my main mount will handle it as well as the C8. I've gotten spoiled using short refractors the last year but I do want a scope good for higher magnifications.

Mike


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