Svbony 406P - collaborative list of compatible eyepieces (6 Viewers)

[Jinac]

Hello everyone,

Knowing that the SV406P is a really good scope for the price but that the eyepiece groove is short (so lots of them can not focusing to th infinite) i think it could be a good idea to list the compatibles eyepieces and possibly criticize them (and obviously list the incompatibles ones).

I'm starting :

Compatible :

• Svbony UFF 18mm => Very good. Bright, good FOV but important CA on the edge
• Svbony Aspheric 23mm => Cheap and not very useful in my eyes, worse than the original zoom
• Svbony PL 6 et PL17 => Cheap and not very useful in my eyes, worse than the original zoom
• Baader Hyperion 13mm =>Very good, but less bright than i expecetd
• Skywatcher Nirvana-ES UWA 7mm => Good, a little more clear than the original zoom (seems have a focal length smaller than the min of original zoom), huge FOV, impossible to see all without mooving the eye and/or the head.

Incompatible :
- Celestron Ultima => the 2 inch section prevent the eyepiece to go down to the bottom of the throat

 

[Saxatilis]

As a fixed eyepiece in addition to the 20x-60x standard zoom, I bought and I use a Celestron WA spotting scope eyepiece (32X/80mm, Regal M2 Series) that fits well

 

[looksharp65]

Largely incompatible: William Optics SWAN 15 mm - very barely reached infinity focus so not for those with ever so slight myopia. I also found the edges disappointing, light years from the AFOV-wise similar Fieldscope eyepieces [EDIT: Obviously used with Fieldscope bodies]. I believe the short FL, 432 mm, of the 406P can make it tricky with edge sharpness of WA eyepieces. This ep performed very nicely with the Celestron C90 but that's a 1250 mm so almost three times longer FL than the 406P. And the Nikon 82 mm is 525 mm so no wonder it's better corrected with the native eyepieces.

Incompatible: GSO Superview 20 mm. Nowhere near reaching infinity focus.

Now that I read about the Nirvanas and that they are all parfocal, I'm probably taking the plunge on the 13 mm. I had thoughts about the successor to my old-time favourite, the BST Explorer, but not sure if it will reach focus. OTOH the eye relief of the Nirvanas is nothing to write home about.

//L

 

[looksharp65]

Incompatible: Skywatcher Nirvana-ES 13 mm which isn't near to reach infinity focus. @Jinac : Either the Nirvana series isn't parfocal or you're a hyperope. Just unpacked it and it seems to be a wonderful eyepiece otherwise, but useless with the 406P ED 80 mm. It'll have to go back :'(

//L

 

[Jinac]

What ?! 😱
I'm a very very little hyperopic but if my remember is good it was far to the limit of the wheels to the infinite...
I check this tonight on stars...

And the set is sold to be par focal...sorry for you, and if I was wrong to the infinite my big big big apologies...

Note : my nirvana 7mm is quasi parfocal with th uff18 Svbony

 

[Jinac]

Ok I've tested it and I confirm that my Nirvana 7mm focus on the stars with or without my glasses, and there are 2/3 of a turn of the wheel left (I'm really not sure of the sense of this sentence in English...after focusing the stars, I can continue to turn the wheel more than 1/2 turn)

And I think that we can say that it's quite parfocal with the UFF18 Svbony

Mistery...

Note : My hyperopic is +0,75

 

[looksharp65]

Well, thank you for your apologies, it's not your fault after all. I think they may be parfocal per se, but that the 13 mm can't be inserted as long inwards as can some other versions.
In fact, it is obvious that the mounting barrel is about 10 mm longer than that of the supplied zoom, and can't be unscrewed.
Because of this, the eyepiece hits the plano glass which is part of the waterproofing of the body. So the eyepieces may very well be optically parfocal but mechanically not at all.

L

 

[Jinac]

😯
Ok ok, that is the explaination...
On the 7mm, the length is really the same as the original zoom...
I'm curious about the 10mm for a 43x...

Damn it, I'll hoped a 7 - 13 - 18 parfocal as a good set...

 

[Jinac]

On this pic the 7mm and the 10mm seems pretty close.
The 13mm is indeed longer...
It's might be a created pic for the sellers but the proportion seems good refering to the diameter of the mounting barrel.
Maybe I'll test it

 

[FredinZona]

Ok I've tested it and I confirm that my Nirvana 7mm focus on the stars with or without my glasses, and there are 2/3 of a turn of the wheel left (I'm really not sure of the sense of this sentence in English...after focusing the stars, I can continue to turn the wheel more than 1/2 turn)

And I think that we can say that it's quite parfocal with the UFF18 Svbony

Mistery...

Note : My hyperopic is +0,75

How do you like the Nirvana 7mm eyepiece?

 

[Jinac]

I like it, I'm not expert but it seems better that the original zoom, the FOV is awesome and the focal is really close than uff18, that's good.

 

[Granpoli]

How much magnification with the Nirvana 7mm?

 

[Jinac]

430/7 = 61

 

[Granpoli]

And... 82°61x = 1.34° field?
You have compared this 7mm Nirvana with the maximun zoom ep. Magnification 60x ?
Thanks

 

[Jinac]

Surprisedly magnification seems a little less than the original zoom but not sure
Fov is very very largier
Luminosity seems better to
More pleasant to use
But not perfect

 

[Jinac]

After many mail, I have an answer from the french important of Nirvana : the 10mm mounting barrel length is 28mm so pretty close of the 7mm which is 27mm
So I think that it will be working.

And I think too that I'll buy it in the future to get a 7, 10, 18 set for 24x, 43x and 61x, parfocal. Seems a good idea

 

[Granpoli]

Yesterday I used the Svony 7.2-21.7 zoom lens in the optical tube for a while, and it focused throughout the entire power range, very similar to the stock zoom, perhaps more parfocal than the stock zoom and a bit more contrast?

 

[Jinac]

Sv191 ?

 

[Granpoli]

Yes, Sv191.

 

[looksharp65]

Would be interesting to know how a XW14 does. Maybe someone has a friend to borrow it from?