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Tell me about your Televue Telescope

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413 replies to this topic

#401 Allan Wade

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Posted 01 April 2020 - 05:20 PM

Curious to know what mount/tripod setup you are using on your scope on the right side of the photo. Thanks, Mark

Mark, it’s a Desert Sky Astro DSV-M mount with an 8” pier extension on a Gitzo 5 series carbon tripod. It’s my light weight travel setup.


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#402 Compressorguy

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Posted 02 April 2020 - 07:24 AM

Woke up early this morning to some finally clear skies. I had already set up the Genesis in the garage to help with acclimation in anticipation of a possibly clear morning and was rewarded. Got a chance to try out the new 9x50 finder and Focusmate 2 speed focuser and I must say I was very pleased with both. Especially the focuser. Made focusing at higher powers a breeze and is very smooth. While viewing I took in the ring nebula, Albireo (just beautiful), Jupiter, Saturn and Mars this morning. The new focuser really made focusing the Jup’s bands easy.  Set up the Nikon for a nice photo op capturing the planetary trifecta in the background. Coffee was good too! All in all a great morning!

 

Approx 60 sec exposure, sorry for the trailing.

 

B24F76E9-DB6A-436F-8D1D-8D6DD0EB74DC.jpeg

 

 

 

 

 

 

 


Edited by Compressorguy, 02 April 2020 - 07:25 AM.

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#403 peleuba

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Posted 02 April 2020 - 11:23 AM

Here is mine...  a TV76 that is "OK" optically.  I purchased it for mostly daytime use, but also some very quick looks at night.  I replaced the TV softcase with a Pelican case.  Photos below.

 

 

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#404 Compressorguy

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Posted 02 April 2020 - 11:28 AM

Very nice setup!



#405 MarkGregory

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Posted 02 April 2020 - 12:01 PM

Very nice setup!

Sorry to hear your Tele Vue 76 is just “OK” optically. They have an excellent reputation. Mark



#406 peleuba

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Posted 02 April 2020 - 12:29 PM

Sorry to hear your Tele Vue 76 is just “OK” optically. They have an excellent reputation. Mark

 

Do you see the test bench image I posted above, and do you understand what its documenting?  Serious question, not trying to be snarky or snippy.

 

I've tested a lot of TeleVue OTA's in the last 25 years or so and while I have never seen a horrible sample, the quality has run the gamat from diffraction limited to near perfect.


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#407 peleuba

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Posted 02 April 2020 - 12:32 PM

Very nice setup!

 

Thanks.  You too.  Its much easier to travel with the hard case.



#408 caronb

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Posted 02 April 2020 - 12:40 PM

Do you see the test bench image I posted above, and do you understand what its documenting?  Serious question, not trying to be snarky or snippy.

 

I've tested a lot of TeleVue OTA's in the last 25 years or so and while I have never seen a horrible sample, the quality has run the gamat from diffraction limited to near perfect.

Could you give a simple explanation of what the problem is?



#409 25585

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Posted 02 April 2020 - 01:20 PM

I noticed you have no tray between the tripod legs. Do you find that not having a tray makes the tripod easier for moving? Setting up? Viewing?  Thinking of taking my tray off of my Televue Panoramic Mount. Thanks, Mark

I have a tray. Not using it does make carrying easier, especially over a shoulder!



#410 25585

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Posted 02 April 2020 - 01:22 PM

Do you see the test bench image I posted above, and do you understand what its documenting?  Serious question, not trying to be snarky or snippy.

 

I've tested a lot of TeleVue OTA's in the last 25 years or so and while I have never seen a horrible sample, the quality has run the gamat from diffraction limited to near perfect.

How do 102s normally score?



#411 Spikey131

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Posted 02 April 2020 - 03:27 PM

Here is mine...  a TV76 that is "OK" optically.  I purchased it for mostly daytime use, but also some very quick looks at night.  I replaced the TV softcase with a Pelican case.  Photos below.

Great minds thinking alikegrin.gif

 

B25E6516-18F0-4F77-B82B-275B0AE68BCA.jpeg


Edited by Spikey131, 02 April 2020 - 03:32 PM.

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#412 peleuba

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Posted 02 April 2020 - 04:36 PM

Could you give a simple explanation of what the problem is?

 

Yes.  The lens suffers from about ¼ wave spherical under-correction.  I posted the green image as the design should be near perfect in green - its not.  If it were the bars would be straight and not curved.  Most (all?) ED doublets are designed to be nulled in green.  Null is another way of saying "no error".

 

With these TV doublets the spacing is adjusted at TeleVue to give best spherical correction.  But there is no free lunch as adjusting the spacing between the two pieces of glass also affects the color correction.  The technician doing the work has to find the happy medium. 


Edited by peleuba, 02 April 2020 - 04:37 PM.

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#413 RadioAstronomer

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Posted 02 April 2020 - 05:13 PM

TV-102 reporting for lunar duty.

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#414 25585

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Posted Yesterday, 03:20 PM

Another TV on the way soon (I hope). Kinda sorta bucket list.


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