.965 x2 Barlow

It uses the best quality optics and is fully coated for maximum light transmission.  It also fully corrects for color aberrations. 

 Ask for P-ring if you might use it in a 1.25" focuser

Click on Picture>>

This Barlow sells for $79. (Bar965-x2)

 Ad #1

1.25" Barlow Lenses 

4 oz

 But you are guaranteed to be purchasing the highest quality barlows both in terms of workmanship and optical quality presently on the market.  For more information see the information below the Barlow pictures on the right.* 

1.5x Barlow: $79 (BAR12515)

1.75x Barlow: $79 (BAR125175)

2x Barlow:  $79 (BAR12520)     

This design makes good baffling possible. 

Many Barlows use relatively inexpensive optics that are configured out to about 50% of the total Dia. This is not too bad if you have a slow scope f7 on up. If you have an f6 or lower the light cone is much larger and penetrates a larger area of the optic. Use this area and serious distortion will start to show up All Siebert optics lens are corrected out to 90% leaving the place for a retainer to hold the optics. That means that the field will remain undistorted in fast scopes. 

Siebert Optics does not expect everyone to know many of these things.  That is why we have made sure that when you purchase a Siebert optics product you are getting better quality then you might realize. There has never been a cheap Barlow on this page and never will be!                

        All Barlows are threaded for filters.     

 Ad #2

2" and 1.25" Telecentric Ultra  Barlows 

     All Ultra 2" Telecentric Barlows are 10oz or less.

Zoom and Regular Telecetric Barlows

Click here for New Modular Zoom Telecentric Barlows

Lower element is larger then its TV counterparts. At 24mm Dia compared to 17mm Dia although the 17mm will fully illuminate any 1.25" and 2" eyepiece.

Other then the super high quality Powermates TV makes, these are one of the only other barlows that offer the added benefit of a 4 element telecentric image. Also maintains the FOV and ER characteristics of your EP's. The 2" 2x units have a clear aperture and magnification ratio to illuminate a 48mm field stop fully. Will act as a flattener so no paracorr should be necessary in faster newtonians. You will not be disappointed iif you try one of these. Elements are multicoated. Guaranteed  with a 30 day return policy..

For Feather touch Self centering eyepiece model can be applied for $50

 Ad #3

1.25" Modular Barlow Lenses 

5 oz

1.5x, 2.0x, 2.5x Barlow:  $139 (BAR1525)

1.5x, 2.5x, 3.5x Barlow:  $139 (BAR1535)

1.5x, 2.0, 2.5x, 3.0x Barlow: $149 (BAR1530)

Feather touch Self Centering model add $30 Click here for details

This is the Siebert Optics Modular Barlow Series.

Click on picture for more details.

Here is a multi power Barlow. Uses the best optics and will work in other configurations such as a corrector lens for binoviewers, Camera focus corrector, can also thread into a standard eyepiece since all components have standard filter threads. Can be used in more then one device at a time. etc...... This product has a 60 day money back guarantee. 

This design makes good baffling possible. 

Instructions for all the (MB) click here.

All barlows have internal baffles including ultra-flat black internal surfaces to eliminate  any internal reflections.  Lens elements are edge blackened to increase contrast.  

Above is the 2x Barlow using all T-6 Aluminum.  It comes with bottom threaded for standard light filters 

 2/10/02                          

 Ad #4

Power Mag Wheel Barlows.        3 Power and now 5 power models

First listed are the All Scopes (PMW)'s Dobs/Ref/SCT/Mak's Mag Wheels. But remember that optics can be added to the Wheel and make it anything you want Questions? email or call.

A) 1.9x    2.6x   3.3x Wheel:  $199 (refWheelBAR1933) Very Little Refocus. Required. 

 B) 2x    3x   4x  Wheel:  $219 (refWheelBAR24) Some Refocusing Required. 

 C)1.5x, 2.0x, 3.0x Wheel:  $219 (refwheelBAR1535) This Mag-Wheel is  Very Near Parfocal in all Mag settings.   Click for details.

D)2" 1.6x, 2.5x, 3.2x Telecentric Wheel:  $349 For 2"EP's (PMWBAR1632) This Mag-Wheel should be easy focus in most scopes (Click for details)

D)2" 2x, 3x, 4x Telecentric Wheel:  $349 For 2"EP's (PMWBAR234) This Mag-Wheel should be easy focus in most scopes

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Now configurations for SCT's / Mak's and Mak's  below

 E)-0.7x  1.5x  2x Wheel:  $219 (SCTWheelBAR03) Some Refocusing Required. 

 F) 5 power models 1.9x - 2.6x - 3.3x - 4.0x  - 4.5x Wheel:  $499 All Scopes (ALLWheelBAR1945) Some Refocusing Required. >>>>>

 5 power model G) SCT 0.65x - 1x - 1.5x - 2x  - 2.5x Wheel:  $499 (SCTWheelBAR1945) Some Refocusing Required. >>>>

H) 5 power model SCT's and Refractor's  Power Mag Wheel 1.0x - 1.6x - 2x - 2.5x - 3.0x >>>>

  $499 (PMWSCT5) 

I) 2" model 1.25x - 1.6x - 1.8x - 2.0x  - 2.5x Wheel:   Telecentric Like  TV PowerMates  (WheelBAR1225)$599

The above four wheels are for single eyepieces and photography as well. Supports cameras binoviewers and single eyepieces with supplied eyepiece holder.

Feather touch Self Centering model add $50 Click here for details

Do you like to switch your scopes magnification without having to change eyepieces or switch barlows....Well here it is. The Power Mag Wheel is the answer. Check out the details below.

New multi power barlow. Uses the best optics and will work in other configurations such as a corrector lens for binoviewers, Camera focus corrector. This product has a 60 day money back guarantee. 

Pic #1 This design makes good baffling possible.

Pic #2 SCT power wheel with Feather touch Self Centering holder.

All barlows have internal baffles including ultra-flat black internal surfaces to eliminate  any internal reflections.  Lens elements are edge blackened to increase contrast.  

                     SCT and refractor model shown. 

<<<<PIC'S SOON but similar to above.    This unit is made to accept 2" eyepieces 

Ad #5

2" 40%  reduction.   Focal length reducers. 

2" FLR -40%  $149. (flr.0602")

2" Feather touch Self Centering model add $50 Click here for details

No taking things apart to set this FLR up.       Mainly for refractors but has Dob uses as well.

Ad #6

2" to 1.25" Zero profile step down adapters. 

Zero profile W/Self centering  as seen in the 2" Elite series Binoviewers  $30.  (CON91SelfD)

All are zero profile adding no height to eyepieces.