Product series:
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.
![Omegon Pro Penta Prisma 90° 1.25''](/Produktbilder/normal/57292_3/Omegon-Pro-Penta-Prisma-90d-1-25-.jpg)
Omegon
Pro Penta Prisma 90° 1.25''
$ 239.00
ready for shipping in 24
h
![Omegon Pro 1.25'', 45° penta-prism](/Produktbilder/normal/57293_3/Omegon-Pro-1-25-45d-penta-prism.jpg)
Omegon
Pro 1.25'', 45° penta-prism
$ 189.00
ready for shipping in 24
h