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Diagonals

This is our selection of diagonals. From dielectric mirrors to regular ones. The diagonal is the accessory you need when you own a refractor or a cassegrain telescope. 

 

  • Original price $59.78 - Original price $59.78
    Original price
    $59.78
    $59.78 - $59.78
    Current price $59.78

    Celestron 1.25" Visual Back (93653-A)

    In stock

    Celestron 1.25" Visual Back A Visual Back is a metal adapter that screws onto the standard rear cell threads of Schmidt-Cassegrain and Maksutov-Cas...

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    Original price $59.78 - Original price $59.78
    Original price
    $59.78
    $59.78 - $59.78
    Current price $59.78
  • Original price $121.03 - Original price $121.03
    Original price
    $121.03
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    Current price $121.03

    William Optics 90° 1.25" Erect Prism (D-EP90-125II)

    William Optics 90° 1.25" Erect Prism This 1.25" 90 deg. erecting prism will very happy to be used with that nice premium refractor of yours! Perf...

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    Original price $121.03 - Original price $121.03
    Original price
    $121.03
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    Current price $121.03
  • Original price $218.12 - Original price $218.12
    Original price
    $218.12
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    Current price $218.12

    D-DIG2D-C-DB-SCT

    Only 1 left!

    William Optics 2" Durabright Diagonal for SCT This 90° 2"mirror-type star diagonal has a Dura-Bright 12mm thick mirror and dielectric mirror coatin...

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    Original price $218.12 - Original price $218.12
    Original price
    $218.12
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    Current price $218.12
  • Original price $203.49 - Original price $203.49
    Original price
    $203.49
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    Current price $203.49

    William Optics 2" Durabright Diagonal (D-DIG2D-C-DB)

    William Optics 2" Durabright Diagonal This 90° 2"mirror-type star diagonal has a Dura-Bright 12mm thick mirror and dielectric mirror coatings for 9...

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    Original price $203.49 - Original price $203.49
    Original price
    $203.49
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    Current price $203.49
  • Original price $172.90 - Original price $172.90
    Original price
    $172.90
    $172.90 - $172.90
    Current price $172.90

    William Optics 1.25" inch RedCat Erecting Prism - Silver Version (D-EP90-125-RC51-SL)

    William Optics 1.25" inch RedCat Erecting Prism - Silver Version (for RedCat 51 only) High quality erecting prism with Red anodized plate , the com...

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    Original price $172.90 - Original price $172.90
    Original price
    $172.90
    $172.90 - $172.90
    Current price $172.90
  • Original price $543.97 - Original price $543.97
    Original price
    $543.97
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    Current price $543.97

    Tele Vue 2" 90° Everbrite Diagonal SCT Package (SCP-8202)

    Tele Vue 2" 90° Everbrite Diagonal SCT Package Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. The Tele V...

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    Original price $543.97 - Original price $543.97
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    $543.97
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    Current price $543.97
  • Original price $524.02 - Original price $524.02
    Original price
    $524.02
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    Current price $524.02

    Tele Vue 2" 90° Everbrite Diagonal (DDP-8004)

    Tele Vue 2" 90° Everbrite Diagonal Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. The Tele Vue 2″ 90° Ev...

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    Original price $524.02 - Original price $524.02
    Original price
    $524.02
    $524.02 - $524.02
    Current price $524.02
  • Original price $405.65 - Original price $405.65
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    $405.65
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    Current price $405.65

    Tele Vue 2" 90° Enhanced Aluminum Diagonal (DEP-8003)

    Tele Vue 2" 90° Enhanced Aluminum Diagonal The Tele Vue 2″ 90° Enhanced Aluminum Diagonal coating provides a 96% reflective surface across all but ...

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    Original price $405.65 - Original price $405.65
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    $405.65
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    Current price $405.65
  • Original price $379.05 - Original price $379.05
    Original price
    $379.05
    $379.05 - $379.05
    Current price $379.05

    Tele Vue 1.25" 90° Everbrite Diagonal (DPC-1250)

    Tele Vue 1.25" 90° Everbrite Diagonal Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. The Tele Vue 1.25″ ...

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    Original price $379.05 - Original price $379.05
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    $379.05
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    Current price $379.05
  • Original price $251.37 - Original price $251.37
    Original price
    $251.37
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    Current price $251.37

    Tele Vue 1.25" 90° Enhanced Aluminum Diagonal (DSC-0125)

    Tele Vue 1.25" 90° Enhanced Aluminum Diagonal The Tele Vue 1.25" 90° Enhanced Aluminum Diagonal coating provides a 96% reflective surface across al...

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    Original price $251.37 - Original price $251.37
    Original price
    $251.37
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    Current price $251.37
  • Original price $428.26 - Original price $428.26
    Original price
    $428.26
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    Current price $428.26

    Tele Vue 1.25" 60° Everbrite Diagonal (DPC-6012)

    Tele Vue 1.25" 60° Everbrite Diagonal The Tele Vue 1.25″ 60° Everbrite Diagonal is an entirely new angle for Tele Vue! It’s a real breakthrough for...

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    Original price $428.26 - Original price $428.26
    Original price
    $428.26
    $428.26 - $428.26
    Current price $428.26
  • Original price $2,660.00 - Original price $2,660.00
    Original price
    $2,660.00
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    Current price $2,660.00

    Lunt B3400 Blocking Filter (B3400s2)

    Lunt B3400 Blocking Filter BLOCKING FILTER ARE REQUIRED ON ALL LUNT SOLAR TELESCOPES The Lunt B3400 Blocking Filter is best for visual work on tele...

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    Original price $2,660.00 - Original price $2,660.00
    Original price
    $2,660.00
    $2,660.00 - $2,660.00
    Current price $2,660.00
  • Original price $1,463.00 - Original price $1,463.00
    Original price
    $1,463.00
    $1,463.00 - $1,463.00
    Current price $1,463.00

    Lunt B600 Calcium K Module

    Lunt B600 Calcium K Module Calcium K (Ca-K) telescopes and filters are used to study the wavelength of 393.4 nm. This emission line is one of two t...

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    Original price $1,463.00 - Original price $1,463.00
    Original price
    $1,463.00
    $1,463.00 - $1,463.00
    Current price $1,463.00
  • Original price $2,194.50 - Original price $2,194.50
    Original price
    $2,194.50
    $2,194.50 - $2,194.50
    Current price $2,194.50

    Lunt B1800 Calcium K Module

    Lunt B1800 Calcium K Module Calcium K (Ca-K) telescopes and filters are used to study the wavelength of 393.4 nm. This emission line is one of two ...

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    Original price $2,194.50 - Original price $2,194.50
    Original price
    $2,194.50
    $2,194.50 - $2,194.50
    Current price $2,194.50
  • Original price $1,842.05 - Original price $1,842.05
    Original price
    $1,842.05
    $1,842.05 - $1,842.05
    Current price $1,842.05

    Lunt B1200 Calcium K Module

    Lunt B1200 Calcium K Module Calcium K (Ca-K) telescopes and filters are used to study the wavelength of 393.4 nm. This emission line is one of two ...

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    Original price $1,842.05 - Original price $1,842.05
    Original price
    $1,842.05
    $1,842.05 - $1,842.05
    Current price $1,842.05
  • Original price $525.35 - Original price $525.35
    Original price
    $525.35
    $525.35 - $525.35
    Current price $525.35

    Lunt B600 Blocking Filter

    Lunt B600 Blocking Filter Which Blocking Filter to Choose The smallest recommended BF for a specific scope allows for the most inexpensive version ...

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    Original price $525.35 - Original price $525.35
    Original price
    $525.35
    $525.35 - $525.35
    Current price $525.35
  • Original price $1,463.00 - Original price $1,463.00
    Original price
    $1,463.00
    $1,463.00 - $1,463.00
    Current price $1,463.00

    Lunt B1800 Blocking Filter

    Lunt B1800 Blocking Filter Which Blocking Filter to Choose The smallest recommended BF for a specific scope allows for the most inexpensive version...

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    Original price $1,463.00 - Original price $1,463.00
    Original price
    $1,463.00
    $1,463.00 - $1,463.00
    Current price $1,463.00
  • Original price $950.95 - Original price $950.95
    Original price
    $950.95
    $950.95 - $950.95
    Current price $950.95

    Lunt B1200 Blocking Filter

    Lunt B1200 Blocking Filter BLOCKING FILTERS ARE REQUIRED ON ALL LUNT SOLAR SYSTEMS The Lunt B1200 Blocking Filter is recommended for imaging use on...

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    Original price $950.95 - Original price $950.95
    Original price
    $950.95
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    Current price $950.95
  • Original price $265.93 - Original price $265.93
    Original price
    $265.93
    $265.93 - $265.93
    Current price $265.93

    Celestron 2" Mirror Diagonal (93527)

    In stock

    Celestron 2" Mirror Diagonal There are few telescope accessories that work as hard or matter as much as a diagonal! An integral part of the optical...

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    Original price $265.93 - Original price $265.93
    Original price
    $265.93
    $265.93 - $265.93
    Current price $265.93
  • Original price $332.43 - Original price $332.43
    Original price
    $332.43
    $332.43 - $332.43
    Current price $332.43

    Celestron 2" Dielectric Star Diagonal with Twist-Lock (93573)

    Celestron 2" Dielectric Star Diagonal with Twist-Lock Ensure maximum light transmission without loss of optical quality with the Celestron Dielectr...

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    Original price $332.43 - Original price $332.43
    Original price
    $332.43
    $332.43 - $332.43
    Current price $332.43
  • Original price $206.08 - Original price $206.08
    Original price
    $206.08
    $206.08 - $206.08
    Current price $206.08

    Celestron 1.25” Dielectric Star Diagonal with Twist-Lock (93571)

    In stock

    Celestron 1.25” Dielectric Star Diagonal with Twist-Lock Ensure maximum light transmission without loss of optical quality with the Celestron Diele...

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    Original price $206.08 - Original price $206.08
    Original price
    $206.08
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    Current price $206.08
  • Original price $70.00 - Original price $70.00
    Original price
    $70.00
    $70.00 - $70.00
    Current price $70.00

    Celestron 1.25" Star Diagonal (94115-A)

    In stock

    Celestron 1.25" Star Diagonal The Celestron 1.25” Star Diagonal slides into the focuser (1.25”) of your refractor or catadioptric telescope and acc...

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    Original price $70.00 - Original price $70.00
    Original price
    $70.00
    $70.00 - $70.00
    Current price $70.00
  • Original price $69.09 - Original price $69.09
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    $69.09
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    Current price $69.09

    Celestron 1.25" 45° Erect Image Diagonal (94112-A)

    In stock

    Celestron 1.25" 45° Erect Image Diagonal Did you know that most telescopes work well for daytime viewing as well as for astronomy? If you have a re...

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    Original price $69.09 - Original price $69.09
    Original price
    $69.09
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    Current price $69.09
  • Original price $424.27 - Original price $424.27
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    $424.27
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    Current price $424.27

    Baader T-2/90° Deluxe Amici Prism with BBHS Coating (AMICI-DX1)

    Baader T-2/90° Deluxe Amici Prism with BBHS Coating T-2/90° Baader Roof-Prism. Manufactured by Zeiss standard, both sides with T-2 system threads....

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    Original price $424.27 - Original price $424.27
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    $424.27
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    Current price $424.27
  • Original price $397.67 - Original price $397.67
    Original price
    $397.67
    $397.67 - $397.67
    Current price $397.67

    Baader T-2 BBHS Mirror Diagonal (MAX-1S)

    Baader T-2 BBHS Mirror Diagonal T-2 BBHS star diagonal withT-2 threads for compatibility with all Baader's Astro T2 system of parts Provides high ...

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    Original price $397.67 - Original price $397.67
    Original price
    $397.67
    $397.67 - $397.67
    Current price $397.67
  • Original price $361.76 - Original price $361.76
    Original price
    $361.76
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    Current price $361.76

    Baader FlipMirror II Star Diagonal (BFM-II)

    Baader FlipMirror II Star Diagonal Baader-FlipMirror II Star Diagonal (BFM II) with three ports: Straight-through (S52, M48 and T-2 on both sides...

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    Original price $361.76 - Original price $361.76
    Original price
    $361.76
    $361.76 - $361.76
    Current price $361.76
  • Original price $956.27 - Original price $956.27
    Original price
    $956.27
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    Current price $956.27

    Baader 2" 90° Deluxe Amici Prism with BBHS Coating (AMICI-DX2)

    Baader 2" 90° Deluxe Amici Prism with BBHS Coating 2" ClickLock-Clamp and 2" nosepiece Correct image orientation Suited for astronomical observati...

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    Original price $956.27 - Original price $956.27
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    $956.27
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    Current price $956.27
  • Original price $410.97 - Original price $410.97
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    $410.97
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    Current price $410.97

    Baader 2" Mirror Diagonal with 2" ClickLock (CLDIAG-2)

    In stock

    Baader 2" Mirror Diagonal with 2" ClickLock With their ground-breaking introduction several years ago of the all-dielectric 2" Maxbright star diago...

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    Original price $410.97 - Original price $410.97
    Original price
    $410.97
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    Current price $410.97
  • Original price $663.67 - Original price $663.67
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    Current price $663.67

    Baader 2" BBHS Mirror Diagonal with 2" ClickLock (MAX-2S)

    Baader 2" BBHS Mirror Diagonal with 2" ClickLock The Baader 2" BBHS Mirror Diagonal with 2" ClickLock brings silver into the 21st Century.  Silver ...

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    Original price $663.67 - Original price $663.67
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    $663.67
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    Current price $663.67
  • Original price $292.60 - Original price $292.60
    Original price
    $292.60
    $292.60 - $292.60
    Current price $292.60

    APM 2" Prism Diagonal w/ Fast-Lock and Ultra Broadband Coating (APM-2-diag-PR-FL)

    APM 2" Prism Diagonal w/ Fast-Lock and Ultra Broadband Coating In contrast to zenith mirrors, the optical path is closed to the rear on this prism....

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    Original price $292.60 - Original price $292.60
    Original price
    $292.60
    $292.60 - $292.60
    Current price $292.60
  • Original price $449.00 - Original price $449.00
    Original price
    $449.00
    $449.00 - $449.00
    Current price $449.00

    APM 2" Herschel Wedge (APM-Herschel-2-DX)

    APM 2" Herschel Wedge Herschel wedges (Solar prisms) are made for the solar observation with refractors. Appr.  95% of the incoming solar light wil...

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    Original price $449.00 - Original price $449.00
    Original price
    $449.00
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    Current price $449.00
  • Original price $239.40 - Original price $239.40
    Original price
    $239.40
    $239.40 - $239.40
    Current price $239.40

    APM 2" Dielectric Star Diagonal with Fast Lock (APM-2-diag-DX-FL)

    APM 2" Dielectric Star Diagonal with Fast Lock With 1/10 wavelength p-v, our star diagonal offers excellent surface accuracy, which results in top ...

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    Original price $239.40 - Original price $239.40
    Original price
    $239.40
    $239.40 - $239.40
    Current price $239.40
  • Original price $146.30 - Original price $146.30
    Original price
    $146.30
    $146.30 - $146.30
    Current price $146.30

    Antares 2" 90° Dielectric Twist-Lock Diagonal (2MD-DTL)

    In stock

    Antares 2" 90° Dielectric Diagonal The Antares 2" 90° Dielectric Twist-Lock Diagonal has multilayer dielectric coating with 99% reflectivity in gre...

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    Original price $146.30 - Original price $146.30
    Original price
    $146.30
    $146.30 - $146.30
    Current price $146.30
  • Original price $133.00 - Original price $133.00
    Original price
    $133.00
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    Current price $133.00

    Antares 2" 90° Dielectric Diagonal for SCT (2MDS-D)

    In stock

    Antares 2" 90° Dielectric Diagonal for SCT 2MDS-D: 2" Mirror Diagonal for Schmidt-Cassegrain thread-on with pressure band retainer and multilayer d...

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    Original price $133.00 - Original price $133.00
    Original price
    $133.00
    $133.00 - $133.00
    Current price $133.00
  • Original price $133.00 - Original price $133.00
    Original price
    $133.00
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    Current price $133.00

    Antares 2" 90° Dielectric Diagonal (2MD-D)

    In stock

    Antares 2" 90° Dielectric Diagonal Antares 2" 90° Dielectric Diagonal with pressure band retainer and multilayer dielectric coating with 99% reflec...

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    Original price $133.00 - Original price $133.00
    Original price
    $133.00
    $133.00 - $133.00
    Current price $133.00
  • Original price $46.55 - Original price $46.55
    Original price
    $46.55
    $46.55 - $46.55
    Current price $46.55

    Antares 1.25" 90° Mirror Diagonal (MSD)

    In stock

    Antares 1.25" 90° Mirror Diagonal The Antares 1.25" 90° Mirror Diagonal provides convenient right angle viewing with refractors and Cassegrains. Th...

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    Original price $46.55 - Original price $46.55
    Original price
    $46.55
    $46.55 - $46.55
    Current price $46.55
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