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Product Manual

Updated Mar 18, 2026• by WO Team 2 min read

Astrograph
https://williamoptics.com/cdn/shop/files/minicat-pers-1.jpg
MiniCat 51 WIFD
178 mm
f/3.5
2024
https://williamoptics.com/cdn/shop/files/Redcat-51-perspective-1.jpg
Cat 51 WIFD
250 mm
f/4.9
2024
https://williamoptics.com/cdn/shop/files/Redcat-61-perspective-1.jpg
Cat 61 WIFD
300 mm
f/4.9
2024
https://williamoptics.com/cdn/shop/files/Redcat-71-WIFD-perspective-1.jpg
Cat 71 WIFD
350 mm
f/4.9
2024
https://williamoptics.com/cdn/shop/files/Redcat-51-II-pers-1.jpg
Cat 51 II
250 mm
f/4.9
2019 (I) / 2021 (II)
https://williamoptics.com/cdn/shop/files/Redcat-71-II-perspective-1.jpg
Cat 71
348 mm
f/4.9
2021
https://cdn.shopify.com/s/files/1/0675/5752/3673/files/UC56-pers-1.jpg?v=1765026851
Ultra-Cat 56
269 mm
f/4.8
2026
https://williamoptics.com/cdn/shop/files/UC-76-pers-1.jpg
Ultra-Cat 76
365 mm
f/4.8
2025
https://williamoptics.com/cdn/shop/files/Cat-91-WIFD-pers-1.jpg
Cat 91 WIFD
448 mm
f/4.9
2024
C-108-pers-1.jpg
Ultra-Cat 108
518 mm
f/4.8
2025
https://cdn.shopify.com/s/files/1/0675/5752/3673/files/UC-131-pers-1.jpg?v=1770104248
Ultra-Cat 131
648 mm
f/4.9
2026
https://williamoptics.com/cdn/shop/files/Pleiades-68-perspective-1.jpg
Pleiades 68
260 mm
f/3.8
2024
https://williamoptics.com/cdn/shop/files/Pleiades-111-pers-1.jpg
Pleiades 111
528 mm
f/4.8
2024
https://williamoptics.com/cdn/shop/files/FLT-180-pers-1.jpg?v=1712717139&width=1400
Pleiades 181
998 mm
f/5.5
2024
G32-pers-1-red.jpg
UniGuide 32
120 mm
f/3.75
2020
G50PB-pers-1.jpg
Uniguide 50
200 mm
f/4.0
2020
G50III-pers-1.jpg
Guiding Scope 50
200 mm
f/4.0
2020
GS-61-pers-1.jpg
GuideStar 61
360 mm
f/5.9
2020
Telescopes
https://williamoptics.com/cdn/shop/files/GT-71-perspective-1.jpg
Gran Turismo 71 II
419 mm
f/5.9
2017 (I) / 2019 (II)
https://williamoptics.com/cdn/shop/files/GT-81-IV-perspective-1.jpg
Gran Turismo 81 IV
478 mm
f/5.9
2017 (I) / 2018 (II) / 2020 (III) / 2022 (IV)
https://williamoptics.com/cdn/shop/files/GT-81-WIFD-perspective-1.jpg
Gran Turismo 81 WIFD
478 mm
f/5.9
2023
GTF-81-1.jpg
GTF 81
535 mm
f/6.6
2011
GT102.jpg
GT 102
703 mm
f/6.9
2013
GT102.jpg
GTF 102
703 mm
f/6.9
2013
GT153-2.jpg
Gran Turismo 153
1188
f/7.8
2018
https://williamoptics.com/cdn/shop/files/FLT-91-EX-RD-pers-1.jpg
Fluorostar 91
540 mm
f/5.9
2021
FLT98 DDG1.jpg
Fluorostar 98
618 mm
f/6.3
2008
FluoroStar-110-TMB-DDG-OTA.jpg
Fluorostar 110
715 mm
f/6.5
2002
https://williamoptics.com/cdn/shop/files/FLT-120-pers-1.jpg
Fluorostar 120
780 mm
f/6.5
2021
FLT123-1.jpg
Fluorostar 123
738 mm
f/6
2011
https://williamoptics.com/cdn/shop/files/FLT-132-pers-1.jpg
Fluorostar 132
910 mm
f/6.9
2006 (I) / 2017 (II) / 2019 (III) / 2021(IV)
FLT151.jpg
Fluorostar 151
998 mm
f/6.6
2013
FLT152-1.jpg
Fluorostar 152
1200 mm
f/8
2008
https://williamoptics.com/cdn/shop/files/FLT-156-pers-1.jpg
Fluorostar 156
1217 mm
f/7.8
2019
FLT152-1.jpg
Fluorostar 158
1121 mm
f/7
2008
https://williamoptics.com/cdn/shop/files/Z-61-II-perspective-1.jpg
ZenithStar 61 II
360 mm
f/5.9
2017 (I) / 2020 (II)
ZenithStar-66-blau-OTA.jpg
ZenithStar 66 SD
388 mm
f/5.9
2006
ZenithStar-66-ED.jpg
ZenithStar 66 ED
400 mm
f/6.1
2005
Ferrari ZenithStar Racing.jpg
Ferrari ZenithStar Racing
388 mm
f/5.9
2007
Ferrari ZenithStar Anniversary.jpg
Ferrari ZenithStar Anniversary
430 mm
f/6.2
2007
Z70ED.jpg
ZenithStar 70 ED
430 mm
f/6.2
2009
Z71ED.jpg
ZenithStar 71 ED
418 mm
f/5.9
2013
https://williamoptics.com/cdn/shop/files/Z-73-III-perspective-1.jpg
ZenithStar 73 III
430 mm
f/5.9
2017 (I) / 2019 (II) / 2020 (III)
Z80FD.jpg
ZenithStar 80 FD
555 mm
f/6.9
2005
ZenithStar-80-II-ED.jpg
ZenithStar 80 II ED
545 mm
f/6.8
2005
GT-81-IV-perspective-1.jpg
ZenithStar 81
559 mm
f/6.9
2018
https://williamoptics.com/cdn/shop/files/Zenithstar-81-perspective-1.jpg
ZenithStar 81 WIFD
559 mm
f/6.9
2024
Z103.jpg
ZenithStar 103
711 mm
f/6.9
2017
Z110.jpg
ZenithStar 110
770 mm
f/7.0
2006
Z126-1.jpg
ZenithStar 126
970 mm
f/7.7
2017
M72.jpg
Megrez 72 FD
430 mm
f/6
2008
M80.jpg
Megrez 80
480 mm
f/6
2001
M80.jpg
Megrez 80 SD
480 mm
f/6
2003
M80.jpg
Megrez 80 II ED
560 mm
f/7
2005
M80.jpg
Megrez 80 Fluorite
480 mm
f/6
2005
megrez 88 498 1.jpg
Megrez 88 FD
498 mm
f/5.6
2008
MG90.jpg
Megrez 90
621 mm
f/6.9
2006
MG110.jpg
Megrez 110
655 mm
f/5.95
2007
FLT123-1.jpg
Megrez 120
900 mm
f/7.5
2010
finder50.jpg
Erecting Finder 50
200 mm
f/4.0
2020
Birding
swan85.jpg
SWAN 83
25x - 75x
2007
Toucan50.jpg
Toucan 50
18x - 36x
2006
Binoculars
Cat-eyes-pers-1.jpg
Cat Eyes 2x42
21 mm
2x
2025
astro2270_01.jpg
22x70 APO
3.18 mm
22x
2008
Astro 7050.jpg
10x50 ED Astro
5 mm
10x
2008
Astro 7050.jpg
7x50 ED Astro
7.1 mm
7x
2008
Fernglas-Ferrari-Visio-8x25.jpg
Ferrari Visio 8x25
3.1 mm
8x
2007
8x42APO.jpg
8x42 APO
5.2 mm
8x
2008
semi-apo 8x42.jpg
10x42 SEMI-APO
4.2 mm
10x
2008
semi-apo 8x42.jpg
8x42 SEMI-APO
5.2 mm
8x
2008
roof8x42.jpg
8x42 ED
5.2 mm
8x
2017
roof8x42.jpg
10x42 ED
4.2 mm
10x
2008
Equatorial Mount
gt1.jpg
GT-1 Mount
2001
 

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