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.
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Original price $59.78 - Original price $59.78Original price$59.78$59.78 - $59.78Current price $59.78| /
Celestron 1.25" Visual Back (93653-A)
In stockCelestron 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...
View full detailsOriginal price $59.78 - Original price $59.78Original price$59.78$59.78 - $59.78Current price $59.78| / -
Original price $121.03 - Original price $121.03Original price$121.03$121.03 - $121.03Current 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...
View full detailsOriginal price $121.03 - Original price $121.03Original price$121.03$121.03 - $121.03Current price $121.03| / -
Original price $218.12 - Original price $218.12Original price$218.12$218.12 - $218.12Current 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...
View full detailsOriginal price $218.12 - Original price $218.12Original price$218.12$218.12 - $218.12Current price $218.12| / -
Original price $203.49 - Original price $203.49Original price$203.49$203.49 - $203.49Current 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...
View full detailsOriginal price $203.49 - Original price $203.49Original price$203.49$203.49 - $203.49Current price $203.49| / -
Original price $172.90 - Original price $172.90Original price$172.90$172.90 - $172.90Current 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...
View full detailsOriginal price $172.90 - Original price $172.90Original price$172.90$172.90 - $172.90Current price $172.90| / -
Original price $543.97 - Original price $543.97Original price$543.97$543.97 - $543.97Current 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...
View full detailsOriginal price $543.97 - Original price $543.97Original price$543.97$543.97 - $543.97Current price $543.97| / -
Original price $524.02 - Original price $524.02Original price$524.02$524.02 - $524.02Current 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...
View full detailsOriginal price $524.02 - Original price $524.02Original price$524.02$524.02 - $524.02Current price $524.02| / -
Original price $405.65 - Original price $405.65Original price$405.65$405.65 - $405.65Current 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 ...
View full detailsOriginal price $405.65 - Original price $405.65Original price$405.65$405.65 - $405.65Current price $405.65| / -
Original price $379.05 - Original price $379.05Original price$379.05$379.05 - $379.05Current 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″ ...
View full detailsOriginal price $379.05 - Original price $379.05Original price$379.05$379.05 - $379.05Current price $379.05| / -
Original price $251.37 - Original price $251.37Original price$251.37$251.37 - $251.37Current 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...
View full detailsOriginal price $251.37 - Original price $251.37Original price$251.37$251.37 - $251.37Current price $251.37| / -
Original price $428.26 - Original price $428.26Original price$428.26$428.26 - $428.26Current 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...
View full detailsOriginal price $428.26 - Original price $428.26Original price$428.26$428.26 - $428.26Current price $428.26| / -
Original price $2,660.00 - Original price $2,660.00Original price$2,660.00$2,660.00 - $2,660.00Current 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...
View full detailsOriginal price $2,660.00 - Original price $2,660.00Original price$2,660.00$2,660.00 - $2,660.00Current price $2,660.00| / -
Original price $1,463.00 - Original price $1,463.00Original price$1,463.00$1,463.00 - $1,463.00Current 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...
View full detailsOriginal price $1,463.00 - Original price $1,463.00Original price$1,463.00$1,463.00 - $1,463.00Current price $1,463.00| / -
Original price $2,194.50 - Original price $2,194.50Original price$2,194.50$2,194.50 - $2,194.50Current 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 ...
View full detailsOriginal price $2,194.50 - Original price $2,194.50Original price$2,194.50$2,194.50 - $2,194.50Current price $2,194.50| / -
Original price $1,842.05 - Original price $1,842.05Original price$1,842.05$1,842.05 - $1,842.05Current 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 ...
View full detailsOriginal price $1,842.05 - Original price $1,842.05Original price$1,842.05$1,842.05 - $1,842.05Current price $1,842.05| / -
Original price $525.35 - Original price $525.35Original price$525.35$525.35 - $525.35Current 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 ...
View full detailsOriginal price $525.35 - Original price $525.35Original price$525.35$525.35 - $525.35Current price $525.35| / -
Original price $1,463.00 - Original price $1,463.00Original price$1,463.00$1,463.00 - $1,463.00Current 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...
View full detailsOriginal price $1,463.00 - Original price $1,463.00Original price$1,463.00$1,463.00 - $1,463.00Current price $1,463.00| / -
Original price $950.95 - Original price $950.95Original price$950.95$950.95 - $950.95Current 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...
View full detailsOriginal price $950.95 - Original price $950.95Original price$950.95$950.95 - $950.95Current price $950.95| / -
Original price $265.93 - Original price $265.93Original price$265.93$265.93 - $265.93Current price $265.93| /
Celestron 2" Mirror Diagonal (93527)
In stockCelestron 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...
View full detailsOriginal price $265.93 - Original price $265.93Original price$265.93$265.93 - $265.93Current price $265.93| / -
Original price $332.43 - Original price $332.43Original price$332.43$332.43 - $332.43Current 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...
View full detailsOriginal price $332.43 - Original price $332.43Original price$332.43$332.43 - $332.43Current price $332.43| / -
Original price $206.08 - Original price $206.08Original price$206.08$206.08 - $206.08Current price $206.08| /
Celestron 1.25” Dielectric Star Diagonal with Twist-Lock (93571)
In stockCelestron 1.25” Dielectric Star Diagonal with Twist-Lock Ensure maximum light transmission without loss of optical quality with the Celestron Diele...
View full detailsOriginal price $206.08 - Original price $206.08Original price$206.08$206.08 - $206.08Current price $206.08| / -
Original price $70.00 - Original price $70.00Original price$70.00$70.00 - $70.00Current price $70.00| /
Celestron 1.25" Star Diagonal (94115-A)
In stockCelestron 1.25" Star Diagonal The Celestron 1.25” Star Diagonal slides into the focuser (1.25”) of your refractor or catadioptric telescope and acc...
View full detailsOriginal price $70.00 - Original price $70.00Original price$70.00$70.00 - $70.00Current price $70.00| / -
Original price $69.09 - Original price $69.09Original price$69.09$69.09 - $69.09Current price $69.09| /
Celestron 1.25" 45° Erect Image Diagonal (94112-A)
In stockCelestron 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...
View full detailsOriginal price $69.09 - Original price $69.09Original price$69.09$69.09 - $69.09Current price $69.09| / -
Original price $424.27 - Original price $424.27Original price$424.27$424.27 - $424.27Current 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....
View full detailsOriginal price $424.27 - Original price $424.27Original price$424.27$424.27 - $424.27Current price $424.27| / -
Original price $397.67 - Original price $397.67Original price$397.67$397.67 - $397.67Current 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 ...
View full detailsOriginal price $397.67 - Original price $397.67Original price$397.67$397.67 - $397.67Current price $397.67| / -
Original price $361.76 - Original price $361.76Original price$361.76$361.76 - $361.76Current 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...
View full detailsOriginal price $361.76 - Original price $361.76Original price$361.76$361.76 - $361.76Current price $361.76| / -
Original price $956.27 - Original price $956.27Original price$956.27$956.27 - $956.27Current 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...
View full detailsOriginal price $956.27 - Original price $956.27Original price$956.27$956.27 - $956.27Current price $956.27| / -
Original price $410.97 - Original price $410.97Original price$410.97$410.97 - $410.97Current price $410.97| /
Baader 2" Mirror Diagonal with 2" ClickLock (CLDIAG-2)
In stockBaader 2" Mirror Diagonal with 2" ClickLock With their ground-breaking introduction several years ago of the all-dielectric 2" Maxbright star diago...
View full detailsOriginal price $410.97 - Original price $410.97Original price$410.97$410.97 - $410.97Current price $410.97| / -
Original price $663.67 - Original price $663.67Original price$663.67$663.67 - $663.67Current 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 ...
View full detailsOriginal price $663.67 - Original price $663.67Original price$663.67$663.67 - $663.67Current price $663.67| / -
Original price $292.60 - Original price $292.60Original price$292.60$292.60 - $292.60Current 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....
View full detailsOriginal price $292.60 - Original price $292.60Original price$292.60$292.60 - $292.60Current price $292.60| / -
Original price $449.00 - Original price $449.00Original price$449.00$449.00 - $449.00Current 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...
View full detailsOriginal price $449.00 - Original price $449.00Original price$449.00$449.00 - $449.00Current price $449.00| / -
Original price $239.40 - Original price $239.40Original price$239.40$239.40 - $239.40Current 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 ...
View full detailsOriginal price $239.40 - Original price $239.40Original price$239.40$239.40 - $239.40Current price $239.40| / -
Original price $146.30 - Original price $146.30Original price$146.30$146.30 - $146.30Current price $146.30| /
Antares 2" 90° Dielectric Twist-Lock Diagonal (2MD-DTL)
In stockAntares 2" 90° Dielectric Diagonal The Antares 2" 90° Dielectric Twist-Lock Diagonal has multilayer dielectric coating with 99% reflectivity in gre...
View full detailsOriginal price $146.30 - Original price $146.30Original price$146.30$146.30 - $146.30Current price $146.30| / -
Original price $133.00 - Original price $133.00Original price$133.00$133.00 - $133.00Current price $133.00| /
Antares 2" 90° Dielectric Diagonal for SCT (2MDS-D)
In stockAntares 2" 90° Dielectric Diagonal for SCT 2MDS-D: 2" Mirror Diagonal for Schmidt-Cassegrain thread-on with pressure band retainer and multilayer d...
View full detailsOriginal price $133.00 - Original price $133.00Original price$133.00$133.00 - $133.00Current price $133.00| / -
Original price $133.00 - Original price $133.00Original price$133.00$133.00 - $133.00Current price $133.00| /
Antares 2" 90° Dielectric Diagonal (2MD-D)
In stockAntares 2" 90° Dielectric Diagonal Antares 2" 90° Dielectric Diagonal with pressure band retainer and multilayer dielectric coating with 99% reflec...
View full detailsOriginal price $133.00 - Original price $133.00Original price$133.00$133.00 - $133.00Current price $133.00| / -
Original price $46.55 - Original price $46.55Original price$46.55$46.55 - $46.55Current price $46.55| /
Antares 1.25" 90° Mirror Diagonal (MSD)
In stockAntares 1.25" 90° Mirror Diagonal The Antares 1.25" 90° Mirror Diagonal provides convenient right angle viewing with refractors and Cassegrains. Th...
View full detailsOriginal price $46.55 - Original price $46.55Original price$46.55$46.55 - $46.55Current price $46.55| /
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