Manufacturer: Optolong
Product number: OPL-CFF-2

EUR 39,90


incl. 19 % VAT (DE)  
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excl. 6.95 € shipping costs (DE)  
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Product expected to be available from 30.05.2025

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rating: 4.6 of 5
  • Details..
  • Technical data..
  • In the box..
  • Manufacturer infos..
  • Safety informations..
Optolong Clear Focusing Filter 2"
Clear focusing filter is designed to highly pass the visible spectral region 420-680 nm at 98.5% transmission. Filter thickness is roughly the same as of the other Optolong filters with the same cell.

Use of astrophotography filters, especially narrowband filters, often results in dim images which can be difficult to focus. Clear focusing filter can be used first to clearly focus the image.

Act as an outstanding dust shield, which prevents the possibility of dust settling on the lens during long time exposure.

Warning: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning!

Substrate:High-quality optical glass from Schott
Thickness:2.0 mm
Surface Treatment:Fine-optically polished
Surface Polish Quality:60/40 (Refer to MIL-O-13830)
Surface Quality:1/4 wavefront
Transmission:approx. 98.5% at passband
Coating:Muti-coated
Cell:Filter cell 2", black anodized, laser engraved
Clear Aperture:45 mm
Cell height:5 mm without external thread, 7 mm with M48 external thread
Filter
Protective Box

Manufacturer / Importeur:Teleskop-Service Ransburg GmbH
Street:Von-Myra-Str. 8
ZIP / City:85599 Parsdorf
Country:Germany
Telefon number:+49 89 99228750
Email:info@teleskop-service.de
Website:www.teleskop-service.de
Safety informations: PDF Download


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Reviews

Written by Gerhard Geipel
on 2025-02-05

"Hab das ""Filter"" gekauft, weil mit den älteren Klarglasfilter der Focus immer bei Wechsel auf andere Optolong Filter immer neu eingestellt werden musste, Das hat sich nun erledigt. Die Fosuposition liegt nun faktisch bei der gleichen Einstellung."

Written by Frank Bindel
on 2022-03-31

"Alles bestens"

Written by GEORGES ROY
on 2022-02-03

"Pas encore utilisé à cause des conditions météo Donc je ne peux pas juger pour l´instant"

Written by Carles rabassa
on 2021-07-29

"Good as described"

Written by Burkhard Wallesch
on 2021-06-17

"Produkt wie beschrieben. Filter in sehr guter Qualität"

Written by Peter Butler
on 2020-11-19

"Excellent quality for the price, and parfocal with other Optolong filters. Works well in my filter wheel when switching between broadband and narrowband targets."

Written by Guido Rensch
on 2019-10-13

"Wie beschrieben."