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Thank you for visiting Siebert Optics!
Serving Large Observatories and the
Amateur Astronomy Community alike.
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200 Short Johnson Road
Clayton, NC
USA 27520
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Advanced Barlow
Lenses including: Modular and 4 element Telecentric magnification
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Multi Magnification
Barlow instruction page.
Here are the
Main instructions
for the Modular Barlows. Look for the model number for specific
instructions.
Read this first > Some have Picture illustrations to
help visualize what the typical setups look like. Optical cells have an
arrow stamped to show the direction of the cell. Arrow alway aims toward
the telescope objective.
These are basic configurations. There
are alternate configurations depending on your equipment. After you
have used this Barlow you may have questions about specific uses..
Call or Email.
Below is a generic image of the Modular Barlows. Other mags available with imagination.

A1a).Model
- 1.5/2.0/2.5x |
A1b).Model
- 1.5/1.7/2.0/2.3/2.5x |
 B1)
Model - 2.0x - 2.5x Supplied
P-ring |
B2)
Model - 2.0x
- 3.0x Supplied P-ring |
C) Model
- 2.0x
- 2.5x - 3.0x |
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1.5x = 1-2-3 |
1.5x = 1-2-3 |
2.0x = 1-3 |
2.0x = 1-2-3 |
2.0x = 1-3 |
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2.0x = 1-6-4 |
1.7x = 1-2-5-3 2.0x = 1-6-4 |
2.5x = 1-2-3
Can use p-ring |
3.0x = 1-2-4
Use p-ring |
2.5x = 1-2-3 |
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2.5x = 1-5-4
Use p-rings for spacing if needed |
2.3x = 1-6-5-4 |
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3.0x = 1-5-3 |
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2.5x = 1-2-5-4 |
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Supplied Delrin P-rings for focus spacing.
E) Model -
2.5x, 3.0x, 3.5x - |
F) Model
1.5x- 2.0x
- 2.5x - 3.0x |
Picture below.Click on
Picture below.

G) Model - 2.5x, 3.5x, 4.5x |

xxxxxxxxx xxxxxxxxx |

xxxxxxxxx xxxxxxxxx |

K1) Model - 2.0x, 3.0x
2" Telecentric series |
2.5.x = 1-2-3
Use 1 p-ring |
1.5x = 1-2-3 |
2.5.x = 1-6-2-3 |
xxxxxxxxx |
xxxxxxxxxx |
2.0x = 1-2-4 |
3.0x = 1-4
Use 1 p-ring |
2.0x = 1-4 |
3.5x = 1-6-5-4 |
xxxxxxxxx |
xxxxxxxxxx |
3.0x = 1-3-4 |
3.5x = 1-2-4
Use 2 p-rings |
2.5x = 1-2-4 |
4.5x =
1-3-5-4 |
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3.0x = 1-2-3-5-4 |
Part #6 important info below.
Click Here!
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See picture. Please message
with questions. |

K2) Model - 2.5x, 3.0x
2"
Telecentric series
Click Picture
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K3) Model - 2.0x, 3.0x
2"
Telecentric series
Click Picture
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1.25" and 2"
L1) Model -
0.8x, 1.2x, 1.3x, 1.4x, 1.5x, 1.7x
The P-ring is needed at time to make
sure the barlow does not go in deep enought to hit your 2" diagonal
mirror. Click Picturexx
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1.25" and 2"
L2) Model -
0.8x, 1.2x,
1.3x, 1.4x,
1.5x, 1.7x,
2.0x, 2.5x The P-ring is needed at
time to make sure the barlow does not go in deep enought to hit your
2" diagonal mirror. Click Picture
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2.5x = 1-2-4 3.0x = 1-3-4 |
2.0x = 1-2-4 3.0x = 1-3-4 |
0.8x = 1-2-3 2"
in-travel needed.
1.2x = 1-5-4-7-3
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0.8x = 1-2-3 2"
in-travel needed 1.2x = 1-5-4-7-3 |
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1.3x = 1-5-3-7-4
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1.3x = 1-5-3-7-4 |
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1.4x = 1-2-4
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1.4x = 1-2-4 |
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1.5x =
1-2-8-7-4
1.7x = 1-2-8-5-4 Pring optional |
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1.5x =
1-2-8-7-4 1.7x = 1-2-8-5-4 Pring optional |
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Part #8 important
information below.
Click Here! |
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2.0x = 1-5-9
2.5x = 1-2-8-6-9 Pring optional |
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As with each of these these are basic configurations. There
are alternate configurations depending on your equipment. After you
have used this Barlow you may have questions about specific uses..
Call or Email. |
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Part #8 important
information below.
Click Here!
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Now the visual walk
though of the 1.5x, 2.0x, 2.5x (MB) Modular Barlow.







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listed products come with a
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unless
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order items are not refundable (items made specifically for you). We
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