Siebert Optics - Barlow Lenses

All these Barlows are Duel Format >>

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

These Barlows are recommended for eyepieces that are 26mm standard field of view and more powerful. More powerful widefields are fine too.

1.5x Barlows

1) This Barlow sells for $89 .965 inlet w/ .965 outlet (Bar965-1.5x)

2) This Barlow sells for $89 .965 inlet w/ 1.25" outlet (Bar965h1-1.5x)

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1.75x Barlows

3) This Barlow sells for $89 .965 inlet w/ .965 outlet (Bar965-1.75x)

4) This Barlow sells for $89 .965 inlet w/ 1.25" outlet (Bar965h1-1.75x)

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2x Barlows

5) This Barlow sells for $89 .965 inlet w/ .965 outlet (Bar965-x2)

6) This Barlow sells for $89 .965 inlet w/ 1.25" outlet (Bar965h1-x2)

Step-Down Adaptor W/ 1.25"OD and .965"ID $15 (125965)

Step-Down Adaptor W/ 2"OD and 1.25"ID $15 (2125)

Want to make sure you are getting exactly the correct item?

#1) This Barlow .965 inlet w/ .965 outlet.

#2) This Barlow .965 inlet w/ 1.25" outlet the 1.25" outlet is for 1.25" eyepieces you might have.

The adaptor W/ 1.25"OD and .965"ID (125965) This adapter is for those who get the #2 model and need the adapter when they want to use their .965 eyepieces. Or want to use their #2 model .965 inlet w/ 1.25" outlet Barlow in a 1.25" focuser and need the adapter to fit the .965 inlet into their 1.25" scope.

Ad #1b

1.25" Performance Barlow Lenses

These equal to or better corrected then any "ED/APO" Barlow available.

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.*

Barlows are 6 oz or less and threaded for filters.

1.5x Barlow: $129 (BAR12515)

1.75x Barlow: $129 (BAR125175)

2x Barlow: $129 (BAR12520)

2.5x Barlow: $129 (BAR12525)

3.0x Barlow. $129 (BAR12530)

3.5x Barlow. $129 (BARx35)

4.0x Barlow. $129 (BARx4)

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

Adaptor W/ 1.25"OD and .965"ID $15 (125965)

Step-Down Adaptor W/ 2"OD and 1.25"ID $15 (2125)

Are all Barlows the same?

The answer is NO! Click here to find out why.

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% of edge 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

For your most demanding Photographic and Visual Applications.

Barlow's are 10 oz or less and threaded for filters.

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

These have a 4 element design similar to the Powermate. Uses larger lens elements then competing models.

1.5x 2"$219 8.5oz (BAR2-1.5X)

1.75x 2"$219 8.5oz (BAR2-1.75X)

2x 2"$219 8.5oz (BAR2-2X)

2.5x 2"$219 9.5oz(BAR2-2.5X )

3x 2" $249 9.5 oz(BAR2-3X)

3.5x 2"$279 9.5oz (BAR2-3.5X)

4x 2" $279 10 oz (BAR2-4X)

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

Add Free low profile 2" to 1.25" step-down adapter upon request

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3.0x 1.25" $149 5oz(BAR125-30X)

2.5x 1.25" $149 5oz(BAR125-25X)

2.0x 1.25" $149 5oz(BAR125-20X)

1.75x 1.25" $149 5.oz(BAR1.25175X)

1.5x 1.25" $149 5.oz(BAR1.25-1.5X)

1.3x 1.25" $149 5.oz(BAR1.25-1.3X)

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

Adaptor W/ 1.25"OD and .965"ID $20 (125965)

Add Free low profile 2" to 1.25" step-down adapter upon request

Modular, Zoom and Regular Telecentric Barlows

Click here for the New 2" T-2 modular Barlows.

Click here for New Modular Zoom Telecentric Barlow

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 #2b

2" Performance Barlows featuring 38mm CA Super dielectric coated.

These equal to or better corrected then any "ED/APO" Barlow available.

For your most demanding Visual Applications in the fastest scopes.

Barlow's are 10 oz or less and threaded for filters.

1.5x 2"$189 (BAR2-1.5bX)

1.75x 2"$189 (BAR2-1.75bX)

2x 2"$189 (BAR2-2bX)

2.25x 2"$189 (BAR2-2.25bX)

2.5x 2"$189 (BAR2-2.5bX )

2.75x 2"$189 (BAR2-2.75bX)

3x 2" $189 (BAR2-3bX)

Comes standard with Nylon tip thumb screws.

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

Add Free low profile 2" to 1.25" step-down adapter upon request

2" Performance 38mm CA Barlows

You will not be disappointed if you try one of these. Elements are Dielectric Coated. 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 all scopes.

Barlows are 5 oz or less and threaded for filters.

A)1.25x - 1.4x, 1.5x - 1.7x Modular $169 (BAR12515m)

B)2.0x - 3.0x Modular. $169 (BAR2030m)

C)2.0x - 2.5x - 3.0x Modular. $169 (BAR202530m)

D)1.5x, 1.65x, 1.75x, 2.0x Barlow: $249 (BAR1520m)

E)1.5x, 2.0x, 2.5x Barlow: $239 (BAR1525m)

F)1.5x, 2.5x, 3.5x Barlow: $239 (BAR1535m)

G)1.5x, 2.0, 2.5x, 3.0x, 3.5x Barlow: $249 (BAR1530m)

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

Adaptor W/ 1.25"OD and .965"ID $20 (125965)

And for the Televue 60mm APO scopes.

New TV 60mm Modular-Barlow. Click here .

1.5x, 2.0, 2.5x Barlow: $249 (BARTV60mm)

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

This is the Siebert Optics Modular Barlow Series.

Instructions for all the (MB) click here.

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

2" 40% reduction. Focal length reducers for SCT's and refractors.

2" FLR -40% $149. (flr.0602")

Comes standard with Nylon tip thumb screws

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

No need to take things apart to set this FLR up. Has uses for refractors. Dob's with extra focus can use a threaded addition which attaches to 2" eyepiece threads..