Manufacturer: Baader
Product number: BA2458291

EUR 334,00


incl. 19 % VAT (DE)  
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UV Filter 2" - for Venus photography
It is nearly impossible to observe Venus´ cloud structures visually. Commonly, amateur astronomers believe that these structures can only be veryfied with relatively big apertures and special telescopes.
But the main problem is the correct filtering. By combination diverse colour and interference filters it is possible to enhance contrast - on the other hand, the subtle cloud structures get lost because light of >400 nm enters the camera.


The Baader Venus filter lets only pass the parts of light where the cloud structures are visible, the UV light.
This makes the photography of Venus in UV light possible, detail becomes visible even in smaller telescopes. All other wavelengths are blocked. This is what makes the structures of Venus´ atmosphere visible in the first place.


The spectral transmission curve
Here one can see that the filter only opens between 300 and 400 nm. The human eye has nearly no sensivity in this range but CCD sensors have. So this filter is recommended only for photographical applications. This filter is precise worked. The substrate is UG-11 glass (2 mm thick) by Schott, treated with a 20-layer dieletrical coating.
Diameter:2"
Transmission at CWL 350 nm:80%
Bandwidth:60 nm
Low profile filter cell:height only 6 mm (8 mm with male thread
Baader UV pass filter



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