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Svbony sv48 90mm

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#1 FrizzleFriend

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Posted 08 April 2019 - 02:25 PM

Anybody know anything about this scope? I'm just getting started with AP and I'm getting very tempted to try this little scope out. Wasn't sure if I should post this here or in the Refractors section.

https://www.ebay.com...W-/323389531793

To my untrained eye it appears to be very similar to the other low cost doublet achromats of similar size. I know some of the stuff Svbony makes is fairly good. Could I expect some decent images from this thing? I realize "decent" means different things to different people. Humor me.

Any obvious flaws that make this something I shouldn't waste my time on? There's very little info on the web about this telescope.

I'd love this community's thoughts.

It's so inexpensive that it's no great loss either way. I'm looking at it mostly as a learning tool but I'd still like to end up with some decent(that word again) images.

Thanks!

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#2 Stelios

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Posted 08 April 2019 - 04:00 PM

An achromat is a poor scope for imaging, particularly with a color camera. The color error is atrocious.

 

On an F/5.5 achromat it will be even worse than normal. Only amoral marketing would designate such a scope as fit for astrophotography.

 

It's not the brand of the scope, it's the type and specifications of the scope that rule it out for anything except widefield *visual* observing. 

 

You should get an ED (or triplet if you can afford it) small refractor as a starter scope for astrophotography. Not an achro. 


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#3 FrizzleFriend

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Posted 08 April 2019 - 04:38 PM

Thank you. That is the info I was after and didn't even know it.

I was comparing this scope to ED doublets and didn't recognize the critical difference is that this does not have ED glass.

I realize Apo is the way to go, but I value my marriage too much to pull the trigger on that right now.

And I just got a crash course in types of glass.

Thanks again.

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#4 luiscalle

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Posted 14 May 2019 - 11:18 AM

Have you asked more info from seller? it's pivotal before making a bad idea about the product. I asked the manufacturer and they kindly told me this scope works good for astrophoto.

 

In fact, i'll tell you my personal experience:  i got some SvBony products before (a 50mm /190mm guidescope, 1 illuminated reticle eyepiece, 2 wide-field eyepieces, a great UHC filter that is better than an Orion or an ES), bought from China and all of them are really well-made, with a excelent quality/price ratio.

 

Like you, I was looking the SvBony Sv48 scope advertising from Ebay and Aliexpress in order to buy it and add it besides my 8" newt astrograph (https://www.aliexpre...907796454.html?). It's not a simple cheap Achromatic scope. It is, in fact, an air-spaced doublet with FMC glass, so i'm decided go for this scope in the near future and see what it happens.

 

They even posted some moon and DSO images taken with it in its advertising.  The moon doesn't show chromatic abeerration appereantly (looks so well in fact), same with m42. Only thing that can be corrected in that picture is the unflattened field, with a good FF for a short refractor (like thr Orion 8893 field flattener) , of course.

 

Most US people have any idea there are some chinese brands like SvBony that offers really good products. I'd suggest you give it a chance.

 

At the end, everything is manufactured in China, so don't worry too much aboud brands. By paying 300USD you won't ask for a Takahashi petzval by obvious reasons and i'm not telling you an APO is not better (it's relative, some doubled ED refractors are as good as APOs), but i'm sure it could give you really good images

 

Regards !!!

 

 

PD: check this link for further information: https://www.svbony.c...-should-to-buy¬†


Edited by luiscalle, 14 May 2019 - 11:25 AM.


#5 tjm8874

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Posted 04 March 2020 - 08:07 PM

Hi I tried this cheap scope,

https://twitter.com/...4038586368?s=20

 

1. first light, Orion M42. found strange ghost around bright stars

https://twitter.com/...7052095488?s=20

 

2. California, Flat, Mosaic

https://twitter.com/...7342788608?s=20

 

3. Ghost pattern, far / on focus / near

https://twitter.com/...2414049280?s=20

 

4. I found spacer metal is shining as ghost pattern

https://twitter.com/...9124797440?s=20

 

5. with 84mm mask ring ghost disappears

https://twitter.com/...7464985600?s=20


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#6 cos

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Posted 14 August 2020 - 10:19 PM

So I wanted to chime in on this product and the vendor to warn other astronomers. 

After reading some comments and understanding the tech, I decided to take the plunge and buy this on Amazon. Disappointingly it took almost 3 weeks to arrive, but I assumed that was the price you pay to buy and off brand scope. Then the problems started.

 

1. The included dove mount for the scope, that allows the scope to be mounted is way too short and is misplaced. This means that the scope cannot be balanced evenly. The scope only provides 2 small holes for mounting the dove mount bracket so even if I purchased another bracket I dont think it will work to evenly balance the scope. To put things into perspective the scope is still front heavy when an DLSR is mounted on the back for prime focus. Ridiculous

 

2. My scope came with a bent axl on the my focuser. I can turn about a half a turn then I have to crank hard to get past the bend, then repeat. I understand manufacturing issues occur, but their support is playing dump and just send emails asking to better understand but offer no real resolution, 

 

3. Worst of all, I went out to text the scope all everything lacked contrast, it looks so bad that I questioned if maybe there was a plastic film on the lens from the factory, and... upon inspection I found out that the front objective lens of the scope is plastic. Yes plastic. like the 30 dollar scope you get at walmart. 

 

I have an 80/400 meade refractor that looks brighter, has better contrast and doesnt have all this nonsense, and it cost me $125 on Amazon 2 years ago. 

 

I spent hours reading about this scope and really thought this would be a decent scope when I bought it, maybe I got a lemon? But the plastic lens just makes me think the company is unethical, 

 

My advise, is stay away, stay far away...... There is a rumor they have great support, but I havent seen it yet. I just have a nice looking piece or garbage mounted out on my deck right now. 

 

Between waiting for days to get email responses and waiting forever while is shipped on the slow boat from China, I am pretty upset. 


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