Siebert Optics - Binoviewers

Whether you have a Dob, Refractor or SCT this is the binoviewer for you. As you will see below nothing even comes close for this price.

New packages below. The most advanced packages start in package #2 and get less expensive as you go down --Questions just email. harrysiebert@nc.rr.com or just call (919 553 3980)

Mel Bartel Diagonal Calculator <Check math here. Remember inside the Calculator you need your objective size and F.L. of your scope. Then the "diagonal" = CA and "To Plane" distance = OP. Play with different focal Lengths to see the changes. The BN25 will impress you.

Acronyms defined: OP=Optical Path, CA=Clear Aperture, FIA=Fully Illuminated Area

Which eyepieces will you will use is now up to you. Panoptic 24mm's, Siebert Ultra 24mm's or 32mm/40mm Plossl's, the sky is the limit. You are not limited to eyepieces in the 20 mm range. In fact you can use the same eyepieces as TV and Baader and not worry about vignette. Want more information on this just call or email. More info below.

You can get a 3 in 1 OCA for your SCT's instead of a 1.25x focus OCA for refractors and Dob's if you would like. Mags for the 3 in 1 are: A reducer or -0.7 - x1 -x2 -x3. This will really makes your set of eyepieces go far.

Acronyms defined: OP=Optical Path, CA=Clear Aperture, FIA=Fully Illuminated Area

These binoviewers are equal to or lighter then any other binoviewers on the market, They have more aperture then any binoviewer costing under $900, This means you can use any eyepieces you wish just like any other large prism binoviewer without the annoying vignette you get with binoviewer of small prism size. They have a OP/CA ratio that gives them the same FIA as the largest prism binoviewers on the market costing 3x plus. This is true in any scope with an optical system from f4 - f10. In fact there is only 2 Prism based binoviewers that will give you ANY diameter of FIA spot in an f4.5 system is (This is not using and Optical Corrector in the system) and they are Baader 28mm and the new BN 25mm dielectric. Want Proof Click here.

Binoviewers are not like most other astronomical equipment. Some take to Binoviewer very quickly and never look back but with others it may take time to understand and identify any compatibility issues you may personally have when using Binoviewers. Many times these compatibility issues are worked past very quickly but for some it is not that simple.

Also weather doesn't cooperate when we need to test that equipment we just purchased. This might put pressure on people to make a quick assessment if their time is limited with a short warranty.

So is there a reason not to give an abundant warranty period. Not if the equipment is known to be received well with few problems and if you virtually never get returns then it will be painless to offer an extended warranty. That way you have the time to truly assess your purchase. In fact a non stated or an extremely limited return policy may be a warning that a company has experienced problems and has too many returns. Thirty days may be reasonable but 60 days is definitely better.

The most advanced packages start in package #2 and get less expensive as you go down --Questions just email. harrysiebert@nc.rr.com or just call (919 553 3980)

25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. $449 (bnbinos#0) When only Binoviewer purchased. $399 as part of most packages.	Package #1 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. Max Light 2" 2pc 1.3x Multi Mag OCA 1.3x -2.0x -2.7x for refractors and dobs. set of Ultra 19mm's (70 deg. fov; 20mm's ER) OR substitute for a set of 24mm's (65 deg. fov; 20mm's ER) small accessory case $896 (bnbinos#1) Package can be used with Newtonians, Refractors and Dobs
Package #2 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. Max Light 2" 2pc 1.3x for refractors and dobs. set of Ultra 19mm's (70 deg. fov; 20mm's ER) OR substitute for a set of 24mm's (65 deg. fov; 20mm's ER) small accessory case $826(bnbinos#2) Package can be used with Newtonians, Refractors and Dobs	Package #3 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. 1.25x Multi Mag OCA or Advanced Max Light 1.8x OCA set of Ultra 19mm's (70 deg. fov; 20mm's ER) OR substitute set of 24mm's (65 deg. fov; 20mm's ER) small accessory case $746(bnbinos#3) Package can be used with Newtonians, Refractors and Dobs
Package #4 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. 1.25x OCA or x2 OCA set of Ultra 19mm's (70 deg. fov; 20mm's ER) OR substitute set of 24mm's (65 deg. fov; 20mm's ER) small accessory case $716 (bnbinos#4) Package can be used with SCT's Newtonians, Refractors and Dobs	Package #5 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. 1.25x Multi Mag OCA or Advanced Max Light 1.8x OCA set 21mm's "Starters" OR your choice of a set of 13mm or 17mm performance series add $49 small accessory case $619 (bnbinos#5) Package can be used with SCT's Newtonians, Refractors and Dobs
Package #6 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. 1.25x OCA or x2 OCA set 21mm's "Starters" OR your choice of a set of 13mm or 17mm performance series add $49 small accessory case $597 (bnbinos#6) Package can be used with SCT's Newtonians, Refractors and Dobs	Package #7 SCT 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. 3 in 1 Multi Mag (0.7x-x2-x3) set of Ultra 19mm's (70 deg. fov; 20mm's ER) OR substitute set of 24mm's (65 deg. fov; 20mm's ER) small accessory case $746 (bnbinos#7-SCT) Package for use with SCT's only
Package #8 SCT 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. 0.7x OCA or x2 Magnifier set of Ultra 19mm's (70 deg. fov; 20mm's ER) OR substitute set of 24mm's (65 deg. fov; 20mm's ER) small accessory case $726 (bnbinos#8-SCT) Package for use with SCT's only	Package #9 SCT 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. set of Ultra 19mm's (70 deg. fov; 20mm's ER) OR substitute set of 24mm's (65 deg. fov; 20mm's ER) small accessory case $617 (bnbinos#9-SCT) Package for use with SCT's only
Package #10 SCT 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. 3 in 1 Multi Mag (0.7x-x2-x3) small accessory case $569 (bnbinos#10-SCT) Package for use with SCT's only	Package #11 SCT 25mm CA Black Night binoviewers with Dielectric coatings With Self Centering Diopter adjusters. set 21mm's "Starters" OR your choice of a set of 13mm or 17mm performance series add $49 small accessory case $478 (bnbinos#11-SCT) Package for use with SCT's only
SCT Corrector section SCT Correctors Super low profile 3 power multi mag 0.7x, 2x and 3x $149 1.25" 2x Super low profile corrector for SCT's, $119 1.25" 3x Super low profile corrector for SCT's, $119 1.25" 4x Super low profile corrector for SCT's, $119 Focal Length Reducers .6x for SCT's (Barlow Type) - $119 0.7x for SCT (Low Profile - Filter Cell Type - $119	OCA's (Optical Correctors) Ultra transmission and performance. Advanced Max Light OCA's 2" 2pc 1.3x OCA (for refractors newts & dobs) - $229 For Dobs , Newts and refractors with 2" Diagonals and focusers. 2" 2pc 1.3x , 2x and 2.7x OCA (for refractors newts & dobs) - $299 For Dobs , Newts and refractors with 2" Diagonals and focusers Low profile section. Advanced Max Light OCA's Compact setups are all 2" diagonal friendly. 1.25" 1.5x OCA - $249 2" Diagonal friendly 1.25" 1.8x OCA - $149 2" Diagonal friendly Simple Refractor & Reflector Plug and Play Correctors 1.25" 2.0x OC, $129 1.25" 2.5x OC, $129 1.25" 3.5x OC, $129 1.25" 4.5x OC, $129
Recommend Eyepieces 17mm Performance WA, $98 set (Reg. $59 each) 13mm Performance WA, $98 set (Reg. $59 each) 19mm Ultra SWA, $198 set (Reg. $119 each) 24mm Ultra Plus SWA, $198 set (Reg. $129 each) 13mm Ultra SWA, $278 set (reg. $149 each) 15mm Ultra SWA, $278 set (reg. $149 each)	Accessory Cases Small Accessory Case w/pluck foam (9"x 6.5"x 3.25"), $25 (SmCase) Medium Accessory Case w/pluck foam(12.75"x 9.25 x 4.25"), $30 (MCase) Large Accessory Case w/pluck foam (16.75"x12"x4.25"), $40 (LgCase) Upgrade any package to Medium Accessory Case for $15 or free upgrade with purchase of two sets of eyepieces. Centering Diopter Adjusters Double diopters to our self-centering eyepiece holders for the Black Night Bino A $149 Value Free with Binoviewers

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