Siebert Optics - 2" Binoviewers

40mm and 45mm. The only ones in their class and part of the Elite series of binoviewers.

Click on links below to read more Reviews on the 2" Black Night Elite Binoviewers

The use of first surface diagonal mirrors will eliminate almost any possibility of reflections that prisms can create and also greatly reduce aberrations. These units have the spec's to outperform any bino in planetary and deepsky use. Try a set of my 2" 34mm or 2" 36mm 70 deg observatory series eyepieces for the ultimate DS view. Low mag correctors in the 1.3x, 1.5x and 1.8x range are available. Add diopters for fine focusing.

Is it a heavy unit? Not in the least. And the Accessories are also light. Add them up and they weigh about as much as a 1.25" setup.

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SCT Accessories pricing:

.6x-.7x FLR for 40mm or 45mm unit for SCT's: $179

Multi Mag OCA for SCT's 0.6x, ******1.2x, ****2.0x, *****2.5x OCA for SCT's: $299

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Self-Centering Diopters for Binos (purchase one or two): $120 for one or $200 for a set

Lightweight Low Profile Self-centering 2" to 1.25" eyepiece adapters (comes in a set): $60

2" 34mm or 2" 36mm Observatory Series (70 deg. fov, 20mm ER): $358 a set (save $40 off reg. price)

2" 24mm's Ultra Plus Series Eyepiece (65 deg. fov, 20mm ER): $258 a set (save $60 off reg. price)

2" 17mm -19mm's Ultra Plus Series Eyepiece (70 deg. fov, 20mm ER): $238 a set (save $60)

2" 13mm-15mm's Ultra Plus Series Eyepiece (70 deg. fov, 20mm ER): $318 a set (save $40)

All other 1.25" eyepieces in the Ultra and Ultra Plus series will be given $20 off a set of eyepieces

** represents a corrector that will fully Illuminate a 35mm Field stop (Will fully Illuminate a 2" 30mm Wide field eyepiece)

*** represents a corrector that will fully Illuminate a 39-42mm Field stop (Will fully Illuminate a 2" 36mm Wide field)

**** represents a corrector that will fully Illuminate a 45mm Field stop (Will fully Illuminate a 2" 40mm Wide field) eyepiece)

***** represents a corrector that will fully Illuminate a 45mm+ Field stop (Will fully Illuminate a 2" 40mm+ Wide field.

Minor and gradual reduction in the illumination of field after the fully Illuminated Field ends.

Magnification factors can change slightly (+ or - .5x) and will depend on you setup and eyepieces used.

I have been asked this many, many time in the last few weeks. So many choices can be a mixed blessing. All the Black Nights have such strong features in their favor. All are premium units and each are priced very competitively for their size and features. So how do you know which units and accessories to purchase? Here is the way each unit can be viewed so you can determine the optimal outfit that best suits your needs.

BN 22
The original Black Night units work very well and have great light transmission. There are also a ton of corrector options and for a great price. These are comparable to the excellent BW-Optic units. If you are on a budget and want a great entry level binoviewer with better than entry level performance the standard Black nights are a fine choice.

Black Night units 22mm CA, 1.4lbs $300 Add a 1.8x OCA and premium 19mm's and your price is $597 A hard to beat deal.
BN 30
If you have a few hundred more to spend and want a unit that compares to the best in every category. Then the LT Echelon 30mm CA might be for you. Great for light scopes with awesome DS and planetary potential. If you want to stay in the 1.25 format then this is your best choice.

Black Night Echelon LT 30mm CA, .75 Lbs
BN 35
All options for these two units are on the 1.25" Black Night Page including the new zoOM OCa and Self centering Diophers. These two all 1.25" binoviewers, that is the 22mm and the 30mm are completely compatible with all the correctors and FLR's " accessories. These are for Large and small scopes alike because of their size weight and 1.25" format.

Now we move into new territory. The Echelon UP 35mm is an interim unit between the true 1.25" units and the Elite 2" units. It is a very strong for a 1.25 unit and a little Weak for a 2" unit. So it is in a class all its own. It has a unmatched Illuminated field for a Bino with a set of 1.25" eyepiece holders. It does have a 2" base since it has a too large bottom Clear aperture (35mm)for a 1.25" focuser shaft which would restricted it to roughly 29mm CA, so a 2" base is necessary. It will use all the Elite Units optical correctors. Use it for the you most demanding deep sky objects were A wide TFOV is not important(Tne 2" Binos will raise the bar there) but brightness is. Try a set of my 24mm WA or 32mm UP eyepieces(you will not be disappointed). Pans would certainly not be wasted in this unit since no unit will Illuminate them better. The UP Echelon will have the widest TFOV possible for a 1.25" eyepieces format and 1.325x mag factor.

Black Night Echelon UP 35mm CA, 1.0 Lbs
BN 40
Now we have the Black Night Elite 40. It is a first in a line of true 2" binoviewers. This units is a perfect balance between size and performance. Use this unit if you want to use 2" eyepieces and low mag correctors (1.5x or even lower 1.325x) for the lowest mag and widest TFOV possible for your scope. No other corrector to date will give this low of a power and only has a 10mm intravel requirement. This unit may be considered optimal for Dobs and refractors since the OCA technology gives a it a boost when compared to the 45mm unit.

Black Night Elite 40mm CA, 1.7lbs
BN 45
Now what might be considered the Grand Daddy of them all. The 45mm unit (Why not the 50mm unit you say.) The 45mm unit is the ultimate balance at present between optical path and clear aperture. 7.25" OP and 45mm of CA. This gives it the greatest advantage in Fully Illuminated Area at the eyepiece. At f8 this represents a 250% increase in FIA over what is presently possible for a 1.25" unit.(Such as the Echelon 30mm unit.)This benefit shows up the most in scope like the SCT. CA rules here. So the 45mm unit and a SCT or MCT with 35mm-40mm will give the ultimate DS view. Even better then the 40mm. So for Dobs and Refractors the 40mm is hard to beat, but for SCT's the 45mm is king.

Black Night Elite 45mm CA, 2.0lbs