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Criterion RV-8 Dynascope: rough, but rockin'

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#51 starman876

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Posted 22 February 2021 - 07:05 PM

Do show us.  Post a link to a video of the Moon with your 60 mm that is the same scale and resolution as mine.  Or post an image of the Moon, Jupiter or Saturn with your 60 millimeter that are the same or better than any of the above I've posted, or any of the following of MY BEST EVER CRITERION RV-8 PLANET IMAGES with point-n-shoot cameras (which I also posted in Solar System imaging forum here on CN years ago when I did them.)  The Moon images are not stacks, but single frames, I left them noisy and didn't do noise removal on purpose to preserve details.     

 

attachicon.gifMVI_0147redover.jpg attachicon.gifSaturnApril17CanonA590.png

 

attachicon.gifMOONIMG_0668TWO.JPG

 

attachicon.gifMOONIMG_0755POUND.jpg

you do have some very nice images on your web site.waytogo.gif


Edited by starman876, 22 February 2021 - 07:05 PM.

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#52 jimifanwing

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Posted 23 February 2021 - 10:54 PM

I bought a “rough but rockin” Dynascope 8 about 9 years ago. It was pretty corroded, but mirror coating was decent and the clock drive worked after a shot of WD40. I totally disassembled and rebuilt the beast. Great planetary views and so cool looking. You got a awesome telescope there!

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#53 terrapin

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Posted 23 February 2021 - 11:26 PM

I bought a “rough but rockin” Dynascope 8 about 9 years ago. It was pretty corroded, but mirror coating was decent and the clock drive worked after a shot of WD40. I totally disassembled and rebuilt the beast. Great planetary views and so cool looking. You got a awesome telescope there!

 

Fantastic looking scope. Great job!



#54 jimifanwing

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Posted 24 February 2021 - 09:04 AM

Thanks. I was very lucky, it just popped up on the local CL.

#55 ccwemyss

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Posted 24 February 2021 - 11:24 AM

There was one on CL here a couple of years ago, but it was too big for a student loaner, and when those are all home, my wife give me a hard time about how they fill my basement space. But it was still very tempting. They have such a beautiful classic design. 

 

My understanding is that the 8" Dynascope is f8, whereas the RV8 is f7. As Dave has noted, the Criterion mirrors he's tested have been spheres, even though they were advertised as parabolic. But I wonder if any of these less common f8s were parabolized? I saw one on AM where the owner found it to be a sphere, and did the correction himself. 

 

Chip W. 



#56 Jason H.

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Posted 24 February 2021 - 02:37 PM

My RV-8 is f/8.125 (not f/7.)  It's the one in the middle.

 

smDSC00697.jpg

 

 

 

 

There was one on CL here a couple of years ago, but it was too big for a student loaner, and when those are all home, my wife give me a hard time about how they fill my basement space. But it was still very tempting. They have such a beautiful classic design. 

 

My understanding is that the 8" Dynascope is f8, whereas the RV8 is f7. As Dave has noted, the Criterion mirrors he's tested have been spheres, even though they were advertised as parabolic. But I wonder if any of these less common f8s were parabolized? I saw one on AM where the owner found it to be a sphere, and did the correction himself. 

 

Chip W. 

 


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#57 ccwemyss

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Posted 24 February 2021 - 08:54 PM

Interesting. I checked Phil Harrington's collection of ads, which show the Dynascope 8 as f8 and the RV8 as f7. But then they also assert that all of their mirrors are parabolized. So maybe the ad copy was just being optimistic. 

 

Chip W. 


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#58 CHASLX200

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Posted Yesterday, 06:37 AM

My RV-8 is f/8.125 (not f/7.)  It's the one in the middle.

 

attachicon.gifsmDSC00697.jpg

I want it back if you ever sell it.



#59 Don07tncav

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Posted Yesterday, 07:26 AM

Picked this one up for $60 and have rewired it along with rebuilding the clutch. Really enjoying the scope. This is the after photo.

 

AAAsmall after.JPG

 

Looks like I was laying on my side for this photo or there was an issue with earth's gravity field.


Edited by Don07tncav, Yesterday, 08:17 AM.

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#60 jelloptic

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Posted Yesterday, 07:37 PM

Nice restoration there, jimifanwing (post #52). Your scope has all the options... clock drive, large setting circles.

 

Question: in your second picture, (out standing in your field)... is your bell pier resting on the ground, or is there a cement pad not visible?

Q2:  do you have the tripod within the pier?

Q3:  is your secondary spider a "figure 8" , as opposed to 4 radial vanes?

 

Again, nice scope, I'm envious, except for its weight (too heavy for me to lug around).

 

regards,   kbl



#61 jimifanwing

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Posted Yesterday, 10:22 PM

Thanks, it was a bit of work. Pedestal was just on the ground. Tripod is within (which is so cool), I had to make new legs. Spider is the two hoop style.

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