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Stellarvue SVX 102D

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#1 Teal'c

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Posted 04 April 2021 - 02:13 PM

I'm thinking about taking the plunge on the SVX 102D before the introductory price goes away. After having the SV102 ABV (LOMO OK4 ) years ago, I'm curious as to how good this new doublet really is.


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#2 jimandlaura26

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Posted 04 April 2021 - 02:32 PM

I would not be curious, given their reputation... and my experience. I would take the plunge.


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#3 Scott in NC

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Posted 04 April 2021 - 02:32 PM

As I know nothing about this new scope, I’m also quite interested to hear what people think (assuming that any of these scopes are out in the wild yet).


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#4 Teal'c

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Posted 04 April 2021 - 03:12 PM

The ABV was an excellent scope and this one is said to be beyond that in performance. Yes, Stellarvue does have a solid reputation. I've had 4 of their scopes in the past.


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#5 Scott in NC

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Posted 04 April 2021 - 03:32 PM

I’ve owned several SV scopes over the past 17 years (my first one was an 80/9D which I purchased brand new in 2004, and still own).  All were very nice scopes, and a few of them will remain long-term keepers. ubetcha.gif  I can’t imagine that you’d go wrong buying a SVX102D sight unseen.


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#6 jimandlaura26

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Posted 04 April 2021 - 03:48 PM

As Scott in NC notes many of us have owned SV scopes, some of us from very early on (early 2000's in my case); and always has been a pleasure.

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#7 Scott in NC

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Posted 04 April 2021 - 03:53 PM

I especially like your Midnight Stardust SV80S. :)


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#8 MrJones

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Posted 04 April 2021 - 04:06 PM

I personally would want this to be f/8 or maybe f/7.5 if they're going to all the trouble to get to 0.99 Strehl. I also don't see the need for a 3" focuser on a 4" doublet. I'm sure they'll be very good and Vic and the people there have always been great to talk to.



#9 Tyson M

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Posted 04 April 2021 - 05:19 PM

I am on the list.  I switched from the 130mm list because it is more useful in my scope's line up. 

 

Needed something high quality for grab and go and my CG4, otherwise larger apertures are going to come out.


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#10 Teal'c

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Posted 04 April 2021 - 05:36 PM

I personally would want this to be f/8 or maybe f/7.5 if they're going to all the trouble to get to 0.99 Strehl. I also don't see the need for a 3" focuser on a 4" doublet. I'm sure they'll be very good and Vic and the people there have always been great to talk to.

I actually like the 3" Focuser offering. 


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#11 Phillip Creed

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Posted 05 April 2021 - 09:58 AM

I like the idea of it being f/7 for imaging purposes.  Particularly if they have a matching 0.74X reducer to drop it down to f/5.25.  Basically, a bit faster than the NP101.

My only question is color correction if you have a modded camera.  No matter how high the *lens figure* Strehl is, it's the polychromatic Strehl that might worry me if the blue and red channels don't play nice together.  I'm guessing--purely speculation--you might see a slight amount of "blue bloat" if you really zoomed in crazy-close, but that's it.

Sure, that might be a concern with any ED doublet when it comes to imaging, but we're talking real money if you add the 0.74X flattener+reducer onto this scope.  Basically $2300 for the pair, with $2800 if you go with the FT focuser.

It's an admittedly attractive package for a discerning visual observer.  Don't know if I'd jump on it as an imager, though.

Clear Skies,

Phil



#12 Space_Race_T.J.

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Posted 05 April 2021 - 12:29 PM

I am on the list as well, waiting patiently for it. This will be my first refractor. Visual use only for me when it arrives.
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#13 photoracer18

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Posted 05 April 2021 - 05:14 PM

I'm thinking about taking the plunge on the SVX 102D before the introductory price goes away. After having the SV102 ABV (LOMO OK4 ) years ago, I'm curious as to how good this new doublet really is.

I have owned 2 SV102ABV over time, having one currently, not to mention an SVA130EDT also. I put a deposit down last month for an SVX127D. Going to be my retirement scope. Just have to figure how I am going to pry the current ones out of my fingers to sell them. Difference is the SVX scopes are further polished to get to .99 Strehl. Hoya FCD100 instead of Ohara FPL-53 and a Lanthanum doped second element like the LOMO SV102ABV. So right now I will have 3 Lanthanum doublets, one with FPL-53 (AT80LE), one with OK-4 (SV102ABV), and one with FCD100 (SVX127D) once the later gets here.


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#14 photoracer18

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Posted 05 April 2021 - 05:21 PM

I like the idea of it being f/7 for imaging purposes.  Particularly if they have a matching 0.74X reducer to drop it down to f/5.25.  Basically, a bit faster than the NP101.

My only question is color correction if you have a modded camera.  No matter how high the *lens figure* Strehl is, it's the polychromatic Strehl that might worry me if the blue and red channels don't play nice together.  I'm guessing--purely speculation--you might see a slight amount of "blue bloat" if you really zoomed in crazy-close, but that's it.

Sure, that might be a concern with any ED doublet when it comes to imaging, but we're talking real money if you add the 0.74X flattener+reducer onto this scope.  Basically $2300 for the pair, with $2800 if you go with the FT focuser.

It's an admittedly attractive package for a discerning visual observer.  Don't know if I'd jump on it as an imager, though.

Clear Skies,

Phil

The purpose of the Lanthanum in the second element is that it suppresses the blue spectrum some due to the elements slightly yellow tint it gives to the glass. One reason I liked the SV102ABV so much. I also like the fact that the SVX127D is F8.


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#15 Heywood

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Posted 05 April 2021 - 05:50 PM

I have owned 2 SV102ABV over time, having one currently, not to mention an SVA130EDT also. I put a deposit down last month for an SVX127D. Going to be my retirement scope. Just have to figure how I am going to pry the current ones out of my fingers to sell them. Difference is the SVX scopes are further polished to get to .99 Strehl. Hoya FCD100 instead of Ohara FPL-53 and a Lanthanum doped second element like the LOMO SV102ABV. So right now I will have 3 Lanthanum doublets, one with FPL-53 (AT80LE), one with OK-4 (SV102ABV), and one with FCD100 (SVX127D) once the later gets here.

 

Are you saying that the SVX127D will use Hoya FCD100 and not Ohara FPL-53?  I have looked on the Stellarvue website, and I cannot see any clear statement regarding which glass is used in the SVX doublets.  All I see is a reference to "super low dispersion optical glass."

 

Thank you.



#16 Space_Race_T.J.

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Posted 05 April 2021 - 06:30 PM

From Stellarvue under Optical Glass Types.

“Glass we will use in 2021: As a result of our experience with FCD100 over the past five years, we will be using more of it. This year (2021) we will be making two new, extremely accurate doublets (4" and 5"). They will be precision figured in our shop in Auburn to .99 Strehl or higher and will be made with Hoya FCD100 mated with a lanthanum element. They will be highest rated doublets we have ever made.”
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#17 Heywood

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Posted 05 April 2021 - 06:45 PM

From Stellarvue under Optical Glass Types.

“Glass we will use in 2021: As a result of our experience with FCD100 over the past five years, we will be using more of it. This year (2021) we will be making two new, extremely accurate doublets (4" and 5"). They will be precision figured in our shop in Auburn to .99 Strehl or higher and will be made with Hoya FCD100 mated with a lanthanum element. They will be highest rated doublets we have ever made.”

 

Thank you for clearing that up!  

 

Heywood



#18 ris242

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Posted 05 April 2021 - 07:34 PM

Are you saying that the SVX127D will use Hoya FCD100 and not Ohara FPL-53?  I have looked on the Stellarvue website, and I cannot see any clear statement regarding which glass is used in the SVX doublets.  All I see is a reference to "super low dispersion optical glass."

 

Thank you.

you should read the whole statement. it is very informative. In a browser, it appears as a link next to the Covid 19 link near the top of the screen.........

 

 

https://www.stellarv...al-glass-types/
 


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#19 Heywood

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Posted 05 April 2021 - 08:54 PM

you should read the whole statement. it is very informative. In a browser, it appears as a link next to the Covid 19 link near the top of the screen.........


https://www.stellarv...al-glass-types/


Yes, it is a good read.

#20 RNSpeed

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Posted 09 April 2021 - 10:18 AM

The purpose of the Lanthanum in the second element is that it suppresses the blue spectrum some due to the elements slightly yellow tint it gives to the glass. One reason I liked the SV102ABV so much. I also like the fact that the SVX127D is F8.

This is interesting, thanks for the information regarding the Lanthanum use.  I have a Stellarvue access 80 which is also FCD100 and Lanthanum and I really like it a lot.  Considering getting on the waiting list for the SVX102D


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#21 Phillip Creed

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Posted 09 April 2021 - 07:05 PM

As awesome a scope as the SVX-102D sounds--and it appears it will give the Tak FC100DF or DZ a run for its money as the premier 4" doublet--I have a tough time justifying the cost for one if I can get a used 102mm Access for half the price.  All I'm really missing is that last bit of crazy-high Strehl that the new model will have.

Personally, I'd probably get the 0.74X reducer but get the Access instead for imaging.  But to each their own.  For those that want to spend the extra money, I get that.  I see no reason why it wouldn't be a great scope for both visual and imaging, with much quicker cooldown vs. a 4" triplet.  An "instant classic", if you will.

Clear Skies,

Phil




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