- Telescopes
- Overview:
Telescopes - Achromatic Refractor
- Apochromatic Refractor
- Overview:
Apochromatic Refractor - ED Refractor - less color aberration than an achromatic
- SD APO - color free 2-element APO objective
- EDT APO - 3 element ED objective
- High End APO with 3-element APO objective - no color aberation
- Flatfield APO with flat field for Astrophotography
- All Apos and EDs from all manufacturers - large overview
- TS APO and ED from Japan with high quality optics
- Overview:
- Newtonian Telescopes
- Dobsonian Telescopes
- RC Ritchey Chretien Telescopes
- Casssegrain Telescopes
- Reflektor Telescopce with Lens Correcture
- Maksutov Cassegrain Telescopes
- GoTo Telescopes
- Solar Telescopes H-Alpha
- Overview:
- Mounts Tripods Rings Rails Power Supply ...
- Overview:
Mounts Tripods Rings Rails Power Supply ... - Mounts Equatorial with GoTo
- Mounts Equatorial without GoTo
- Mounts Azimutal with GoTo
- Mounts Azimutal without GoTo
- Mounts GoTo - Harmonic Drive
- Travel mounts for astro imaging
- Tripods Piers Polar Wedges
- Mount Control & Electronics
- Dovetail Clamps, Plates and Mount Adapters
- Tube Rings
- Power Supply
- Counterweights Balance Weights
- Mount Accessories - Other
- Overview:
- Telescope Accessories
- Overview:
Telescope Accessories - Eyepieces
- Barlows & Reducer Lenses
- Diagonal Mirrors and Prisms
- Binocular Viewers
- Finder Scopes
- Telescope Collimation and Test
- Cleaning Tools
- Transport and Storage
- Dust protection for Telescopes & Accessories
- Stray Light Protection
- Dewcaps and Heater
- Focusers, Adapters, Motorfocus
- Telescope DIY & Improvement
- Other telescope accessories
- Replacement Parts
- Overview:
- Filters
- Overview:
Filters - Color Filters and Color Filtersets
- Nebular Filters for Visual Observing
- Neutral-Density and Polfilter
- Photo Narrowband Nebular Filters
- Photo Broadband Filters
- Photo Planetary Filters
- Photo R-G-B and IR Cut Filters
- Photo - Filtersets
- Photometric Filters
- Clip Filter for DSLR Cameras
- Filter Wheels and Filterslider
- Solar Filters for white light
- Solarfilter for H-Alpha and Calcium
- Overview:
- Adaptors
- Overview:
Adaptors - Adapter 1,25" and 24,5mm
- Adapter 2"
- Adapter T2 - M42x0.75
- Adapter M48x0,75
- Adapter M54
- Adapter SC
- Adapter M63
- Adapter M68
- Adapter to other Threads
- Adapter Extensions
- Adapter camera bayonet
- Adapter Objective Filterthread
- Adapter Quick Changing , Rotation
- Adapter Eyepiece Projection
- Adapters Tilting
- Overview:
- Astrophotography and Photography
- Overview:
Astrophotography and Photography - Cooled Cameras
- Cameras without Cooling
- Deep-Sky Cameras uncooled
- Set-Offers Camera, Filter, Wheels
- Acessories for Cameras
- Travel mounts for astro imaging
- Imaging Correctors for Telescopes
- Autoguiding Cameras & Sets
- Everything for Guiding
- Focusing aids - Bahtinov mascs
- Flat Field foils and boxes
- Lenses for Cameras
- Piggyback Camera Holder
- Camera Bags, Photocases & more
- Digital Camera and Smartphone Adapter
- Other photo accessories
- Overview:
- Binoculars, Spotting Scopes, Microscopes, Range Finders
- Overview:
Binoculars, Spotting Scopes, Microscopes, Range Finders - Roof Prism Binoculars
- Binoculars with Porro prisms
- Binoculars from 100mm Aperture
- Binoculars with 1,25 inch eyepieces
- TSMX APO Binoculars
- Binoculars for Astronomy
- Binoculars Hiking Bird watching
- Monoculars - Opera Binoculars
- Accessories for Binoculars
- Spotting Scopes
- Range Finders
- Microscopy
- Bags for Phototripods & Binoculars
- Overview:
- Phototripods and Binomounts
- Books, Software
- Overview:
Books, Software - Books for Astronomy Beginners
- Star Charts and Planispheres
- Books about our Solar System
- Observing Tips for Amateurs
- Popular Astronomy Literature
- Teaching material
- Astrophotography books
- Telescopes, Observatories, Construction
- Calendars Yearbooks
- Software, Star Charts
- Books for Microscopers
- Books Nature and Animals
- Nature Photography TimeLapse
- Overview:
- Night Vision, Magnifiers, Weather, Domes & more
- Beginner Astronomy and Gift Ideas
- Second Hand & Special Offers
- New products
manufacturers
ZWO T2 Extension Tube - M42x0.75 - length 21 mm Reviews
6/6 Reviews
Wrote by Christian K. on 28.05.2025
"Alles wie erwartet."
Wrote by Dr. Helmut Z. on 12.04.2025
"Gutes Produkt"
Wrote by Freddy M. on 28.12.2023
"No issues with the product"
Wrote by Jan H. on 05.04.2022
"Good quality"
Wrote by Rolf B. on 05.09.2021
"Passt genau und hilft Einstellungszeit sparen"
Wrote by Alexander R. on 10.08.2021
"Passt einwandfrei!"
