Это я спрашивал про 50х50мм фильтры HighSpeed
these filters are for f/3 (or less) telescopes mainly. There are not many models on the market wich have such a wide corrected field.
Therefore the demand is currently not give to produce many thousands of these filters (wich would be necessary in a production run).
It may happen that we will produce them when demand increases in future, when cameras with such big sensors and f/2 telescope with such wide fields become more common.
Please have a look at our homepage every few month, in case we produce something new we will announce it there
Best regards,
Michael Risch
BAADER PLANETARIUM GMBH