Filter thread
![Left a 1.25" and right a 2" eyepiece with filter attached](/CMS/images/text/glossary/Okular Filtergewinde.jpg)
Use filters for your observing: most astronomical eyepieces offer you the option to use moon filters, polarizing filters, colour or nebula filters. This will improve your observing experience and reveal a number of details that were previously not visible to you. At the lower end of the eyepiece sleeve of your 1.25" and 2" eyepieces you will find a female thread. You can use this to attach any filter from our range.
![TS Optics Extension tube M48 / M63 variabel 20.5 - 31mm](/Produktbilder/normal/63920_1/TS-Optics-Extension-tube-M48-M63-variabel-20-5-31mm.jpg)
TS Optics
Extension tube M48 / M63 variabel 20.5 - 31mm
$ 60.00
ready for shipping in 3-7
days
![TS Optics 1.25" extension tube, 25mm optical path](/Produktbilder/normal/43674_1/TS-Optics-1-25-extension-tube-25mm-optical-path.jpg)
TS Optics
1.25" extension tube, 25mm optical path
$ 24.90
ready for shipping in 3-7
days
![TS Optics Extension tube 35mm 1.25"](/Produktbilder/normal/43673_1/TS-Optics-Extension-tube-35mm-1-25-.jpg)
TS Optics
Extension tube 35mm 1.25"
$ 28.90
ready for shipping in 24
h
![Baader Extension tube 2" deluxe 60mm extender](/Produktbilder/normal/10625_1/Baader-Extension-tube-2-deluxe-60mm-extender.jpg)
Baader
Extension tube 2" deluxe 60mm extender
$ 80.00
ready for shipping in 1-2
weeks