[Bundle] Cat 91 WIFD & ZWO AM3 Full Package
3 998,00 €Complete bundle: William Optics Cat 91 WIFD (91mm f/5.9 Petzval astrograph) paired with ZWO AM3 harmonic drive mount. Ready for deep-sky imaging out of the box.
Showing 1–24 of 143 results
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![[Bundle] Cat 91 WIFD & ZWO AM3 Full Package](https://www.nordicastro.com/wp-content/uploads/2026/03/Cat91_ZWOtripod-1-300x300.jpg)
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![[Bundle] Cat 91 WIFD & ZWO AM5N Full Package](https://www.nordicastro.com/wp-content/uploads/2026/03/PM90_UC91-1-300x300.jpg)
[Bundle] Cat 91 WIFD & ZWO AM5N Full Package
5 348,00 €Complete bundle: William Optics Cat 91 WIFD (91mm f/5.9 Petzval astrograph) paired with ZWO AM5N harmonic drive mount for deep-sky astrophotography.
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![[Bundle] Gran Turismo 81 IV Astro Imaging Package](https://www.nordicastro.com/wp-content/uploads/2026/03/GT-81-IV_Flat6AIII-red-300x300.jpg)
[Bundle] Gran Turismo 81 IV Astro Imaging Package
1 402,00 €Complete imaging package: William Optics Gran Turismo 81 IV triplet APO refractor with essential astrophotography accessories included.
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![[Bundle] GuideStar 61 Astro Imaging Package](https://www.nordicastro.com/wp-content/uploads/2026/03/GS-61-imaging-bundle-1-300x300.jpg)
[Bundle] GuideStar 61 Astro Imaging Package
708,00 €Complete imaging package with the WO GuideStar 61mm APO refractor and essential astrophotography accessories. Compact and versatile for guiding or lightweight imaging.
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![[Bundle] iOptron SkyGuider Upgrade Kit](https://www.nordicastro.com/wp-content/uploads/2026/03/iOptron_SkyGuider_Upgrade_Kit-1-300x300.jpg)
[Bundle] iOptron SkyGuider Upgrade Kit
333,00 €Upgrade kit for the iOptron SkyGuider Pro star tracker with improved William Optics mounting accessories for a more rigid astrophotography setup.
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![[Bundle] RedCat 51 WIFD & ZWO AM3 Full Package](https://www.nordicastro.com/wp-content/uploads/2026/03/Redcat-51-bundle-1_08d5968d-e53a-4df8-8768-a6c011b2b49d-300x300.jpg)
[Bundle] RedCat 51 WIFD & ZWO AM3 Full Package
2 298,00 €Complete bundle: William Optics RedCat 51 WIFD (51mm f/4.9 Petzval astrograph) with ZWO AM3 mount. Ultra-compact deep-sky imaging package.
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![[Bundle] RedCat 71 WIFD & ZWO AM3 Full Package](https://www.nordicastro.com/wp-content/uploads/2026/03/Redcat-71-bundle-1_80e24181-77aa-420c-bb6f-780c659eb9ad-300x300.jpg)
[Bundle] RedCat 71 WIFD & ZWO AM3 Full Package
2 988,00 €Complete bundle: William Optics RedCat 71 WIFD (71mm f/4.9 Petzval astrograph) with ZWO AM3 harmonic drive mount. Flat-field widefield imaging ready.
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![[Bundle] Ultra-Cat 108 & ZWO AM5N Full Package](https://www.nordicastro.com/wp-content/uploads/2026/03/PM90_UC108-1-300x300.jpg)
[Bundle] Ultra-Cat 108 & ZWO AM5N Full Package
6 388,00 €Premium bundle: William Optics Ultra-Cat 108mm Petzval astrograph with ZWO AM5N harmonic drive mount. Serious aperture for capturing faint deep-sky targets.
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0.72x focal reducer/field flattener P-FLAT8
901,55 €Revolutionary new WO x0.72 Adjustable Reducer/Flattener made for f/6 – f/7.8 refractors. This high-quality flattener has been engineered and CNC machined for usage with William Optics’ GT153, FLT 132,
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0.8x Reducer/Flattener Flat73R
389,00 €Brand new adjustable flattener/reducer for the William Optics Zenithstar 73 OTA. You can set the correct spacing for your camera without the need for extension tubes.
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1.25″ 2x Barlow nosepiece for binoviewers
44,00 €1.25″ 2x Barlow nosepiece for binoviewers. Doubles magnification while providing the correct optical path length for binoviewer focus.
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1.25″ 90° Dura Bright Dielectric Diagonal
151,05 €This 90° 1.25″mirror-type star diagonal has a Dura-Bright thick mirror and dielectric mirror coatings for 99% reflectivity which provides higher contrast and resolution during critical planetary, lun
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1.25″ 90° Erect Prism
47,40 €This 1.25″ 90 deg. erecting prism will very happy to be used with that nice premium refractor of yours! Perfect for daytime observations too.
Precision PrismImage erecting BAK7 prism with a
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1.25″ 90° Erect Prism for Cat 51 WIFD
151,05 €High quality erecting prism with Red anodized plate , the complete housing is made by 6061T Aluminium by CNC .
This 1.25″ 90 deg. erecting prism will very useful for daytime observations.Image
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1.25″ 90° Erect Prism for Cat 61 WIFD
151,05 €1.25″ 90° erect image prism for the WO Cat 61 WIFD. Correctly oriented view for daytime terrestrial and casual astronomical observing.
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1.25″ Amici Prism – 45°
119,00 €William Optics new 45 Deg. EP will work with any 1.25″ eyepieces and scopes with 1.25″ eyepiece holders. It will turn upside down images right side-up and give correct left-to-right image. This high-q
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1.25″ RedCat erecting prism
141,00 €1.25″ RedCat erecting prism – for RedCat 51 only This 1.25″ 90 deg. erecting prism is very useful for daytime observations. • Image erecting BAK4 prism with anti-reflection coating. • High accuracy an
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2″ → 1.25″ RotoLock Visual Back Adapter
53,00 €2″ to 1.25″ RotoLock visual back adapter. Simple twist action securely clamps 1.25″ eyepieces without thumbscrews.
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2″ dielectric diagonal mirror
113,05 €William Optics Dura Bright 2″ dielectric diagonal mirror with 1/12λ, 99 % reflectivity and FULL carbon fiber plates. This diagonal fits all 2 inch focusers.
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2″ dielectric diagonal mirror (SCT)
255,00 €William Optics Dura Bright 2″ dielectric diagonal mirror with 1/10λ, 99 % reflectivity and FULL carbon fiber plates. This diagonal fits to the back thread of a Schmidt-Cassegrain telescope (
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2″ Push-in Nosepiece → M48 Adapter
33,00 €Single piece serves multiple purposes:
2″ Push-in Nosepiece for 2″ Diagonals
M48 (36mm) Extender for 50mm Guider -
2″ Push-In Nosepiece → M63 Adapter for FLAT 6AIII
44,00 €Easily adapt your FLAT 6AIII to any 2″ telescope focuser, except for Twenty Years Anniversary Edition.
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250mm Dualside Plate (Manfrotto & Arca Swiss Type)
69,00 €This William Optics dovetail plate has both “Manfrotto and Arca Swiss size at opposite side design“ the plate also has two 1/4-20 threaded hole , it’s so easy to use with most camera and camera l
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3.5″ → 2″ RotoLock Visual Back Adapter
194,00 €3.5″ to 2″ RotoLock visual back adapter. Secure twist-lock mechanism for 2″ eyepieces without thumbscrews.