Bessell (Johnson-Cousins) UBVRI filters are 25.4
mm diameter and available for immediate delivery. They are made exclusively
for us per our design requirements and meet the highest standards
for optical perfection. The exterior surfaces are multi-layered anti-reflection
coated and polished to a 60-20 (better than 60-40) scratch-and-dig
specification to minimize light scatter. The wavefront distortion
is less than 1/4 wave at 632 nm. All filters are parfocal for a maximum
+/- 0.05 mm focal shift. The filters are available loose or mounted
in a threaded cell that is compatible with the popular CFW filter
wheels from SBIG. Price is $125.00 each. See our price list for stock
numbers. Click
here to download detailed transmission curves in pdf
format.
