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Thinking about trying a SV115 TMB/LZOS again...

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#1 Scott in NC

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Posted 22 May 2014 - 06:05 PM

A couple of years ago I had a SV115 TMB/LZOS f/7 triplet apo. I ultimately sold it because it was a little too heavy for the mount/tripod setup that I had at the time. But in the meantime I've acquired a DiscMounts DM6 and Berlebach Planet tripod, which should be just right for a scope that beefy. Now I'm thinking about buying one again, if one happens to come along for the right price. And I'm not talking about the newer iteration of the SV115, even though a lot of people seem to be quite fond of that scope. I'm talking about the original SV115, with Russian OK4 glass.

So what do the rest of the refractor aficionados on this forum think?

#2 Scott in NC

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Posted 22 May 2014 - 06:13 PM

Here's a pic of my former SV115, that I'm starting to miss now:

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#3 BCNGreyCat

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Posted 22 May 2014 - 07:08 PM

I owned one before with stardust white and used it on DM-6. Solid and smooth. It was a very good scope. And DM-6 is a perfect match.

Only drawback is the scope is too heavy for 115mm aperture. With everything, it's over 20lb. And in winter, it took too long to settle.

On paper, 115mm seems a noticeable light gathering gain vs 102mm. But in suburban, not so much.

I finally sold it. But I admit anodized blue is very very tempting.

#4 Scott in NC

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Posted 22 May 2014 - 07:29 PM

Well, now that I think about it, that is another factor that led me to eventually sell it. Despite having only 1/2" more aperture than my SV102ABV LOMO doublet apo, it was a LOT heavier, and took quite a bit longer to cool down during cold winter nights. Mounted properly, and allowed to cool down appropriately, though, it's a pretty awesome scope.

#5 BCNGreyCat

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Posted 22 May 2014 - 07:37 PM

and allowed to cool down appropriately, though, it's a pretty awesome scope.


Yup! During winter, I had to put it in garage in the morning if I decided to observe at night. If in CA or FL, it probably is not an issue.

#6 Alan S

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Posted 22 May 2014 - 09:30 PM

Scott,

Listen, what I am about to tell you will not be good news for your wallet or maybe even your kids college fund, but I know you and like you...so I'll be honest with you.

Give up.

That's right, give up, forget the 115 and get a larger refractor. You know you want to! You have enough in the 4 inch and below range...it is time for a 130 or 140...

The original SV 115's were nice, for sure, but they are 115's...heck, mabe you should even look to the Lunt 152!

I know I am off topic, sort of, but you needed a friend to call you out.

Can you tell it is cloudy here?
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#7 jtpowers

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Posted 22 May 2014 - 09:53 PM

OTOH, there is exactly this scope for sale on Astromart right now... :poke:

#8 Scott in NC

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Posted 22 May 2014 - 10:06 PM

OTOH, there is exactly this scope for sale on Astromart right now... :poke:


Yes, I'm painfully aware of that, hence the reason for my starting this thread. I think I'll put a link to the ad here so that someone else will buy it and remove the temptation from me! :grin: It's really pretty, and anodized blue, too! Fortunately the seller hasn't yet responded to my email, so maybe some other lucky buyer has already snagged it.

link to Astromart ad

#9 Scott in NC

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Posted 22 May 2014 - 10:10 PM

Scott,

Listen, what I am about to tell you will not be good news for your wallet or maybe even your kids college fund, but I know you and like you...so I'll be honest with you.


Yeah, you're right, Alan. I'm glad I have friends like you to try to talk some sense into me. The 115 has only 27% more light-gathering ability than my 102 but weighs almost 50% more. It's got about the same jump in light-gathering ability when going from a 90mm to a 102mm scope, which really isn't much for practical purposes.

Lunt 152mm, huh? Now you're talking... :grin:

#10 JustaBoy

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Posted 23 May 2014 - 12:29 AM

Scott,

Lunt 152.


Please let us know how you like it!

#11 Scott Beith

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Posted 23 May 2014 - 07:52 AM

That 115 is beautiful!

#12 Starhawk

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Posted 23 May 2014 - 09:51 AM

The Lunt 152 would be obviously different from your 102. Regardless of what you decide, the real difference from 4" happens at 5", which is also typically the sweet spot for defeating the Frei limit on even nights of lousy seeing.

-Rich

#13 Scott in NC

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Posted 23 May 2014 - 10:13 AM

Hold on a sec, it just occurred to me that we maybe we're talking about two different things. I thought we were discussing a Lunt 152mm H-alpha scope (which I can't afford), but maybe you're talking about a Lunt 152mm ED doublet (which I don't really want, as once I get to that size, I'd just as soon use my 8" SCT or 12" dob). Regardless, it's still fun to talk about these things! :ubetcha:

#14 JustaBoy

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Posted 23 May 2014 - 10:41 AM

Scott,

You should at least consider 'wanting' one?

After all, You Are a Refractors Mod!


:-)

#15 Scott in NC

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Posted 23 May 2014 - 10:48 AM

Scott,

You should at least consider 'wanting' one?

After all, You Are a Refractors Mod!


:-)


Too true, Chuck! Maybe I should rephrase myself. What I "don't want" is to spend money on that type of scope at this particular point in time. What I "would love" is if someone handed me one of these scopes to test out, free of charge. I would not turn that down at all, no sireee! :grin:
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#16 Scott in NC

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Posted 23 May 2014 - 10:55 AM

So I did some reading about the Lunt 152mm f/7.9 ED doublet. It actually looks like a very nice scope. I admit that I was tempted. :) Then I saw the price, and that brought me back down to earth. :(

#17 JustaBoy

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Posted 23 May 2014 - 11:10 AM

What? - Afraid of a little Meteor shower?

We're not talking an AP 130mm here. ya know...


:-)

#18 Scott in NC

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Posted 23 May 2014 - 11:13 AM

Well, fortunately so far I'm safe from making any major expenditures right now, since the AM seller has yet to respond to my email. :grin:

#19 SteveC

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Posted 23 May 2014 - 02:40 PM

Hold on a sec, it just occurred to me that we maybe we're talking about two different things. I thought we were discussing a Lunt 152mm H-alpha scope (which I can't afford), but maybe you're talking about a Lunt 152mm ED doublet (which I don't really want, as once I get to that size, I'd just as soon use my 8" SCT or 12" dob). Regardless, it's still fun to talk about these things! :ubetcha:


What's on your DM6 now? That's a hefty mount and overkill for any 115mm refractor.
I'm thinkin your 8" SCT is just as easy to setup.

#20 Joe C

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Posted 23 May 2014 - 02:56 PM

I agree with Steve. That DM6 is a little overkill for a 115. Why not just go for the Stellarvue 130 or TMB130SS that are listed. Better yet, there is always the TEC140:-)

#21 Scott in NC

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Posted 23 May 2014 - 03:08 PM

The biggest scope I use on my DM6/Berlebach Planet right now is my 102mm f/7.75 (FL 790mm) doublet apo. That mount/tripod combo really is overkill for that scope. But I bought it soon after selling a larger refractor and realizing that I didn't want to be undermounted if I ever bought a larger refractor again in the future.
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#22 Scott in NC

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Posted 25 May 2014 - 12:47 PM

Thanks for everyone's advice. I've come to the conclusion that I don't really need any new scopes right now. What I need is more clear skies, good health, and free time to observe! :grin: Unfortunately, none of those can be purchased. :p

#23 BCNGreyCat

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Posted 25 May 2014 - 12:54 PM

Thanks for everyone's advice. I've come to the conclusion that I don't really need any new scopes right now. What I need is more clear skies, good health, and free time to observe! :grin: Unfortunately, none of those can be purchased. :p


Do you need one? No. Do you want one? YES!! :D

Follow your heart! :grin:

#24 Scott in NC

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Posted 25 May 2014 - 01:14 PM

:grin:

#25 NHRob

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Posted 25 May 2014 - 04:27 PM

Scott,
Actually you do need a new scope. You just don't realize it.
How about a ... Tsa-120? A tad more aperture
and lighter weight.


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