New ZWO narrowband filters Ha OIII SII parfocality.

miguelyx

Hi, some months ago i purchased the 3 filters Ha OIII and SII with EFW 8 holes and ASI 1600 mm Pro, in any place where i watch these filters they say that are parfocal, but i need to readjust focus every time that i change the filters.

Seem that are not parfocal.

I have checked if any are incorrectly placed in the EFW, but they are correctly positioned and fully threaded.

Please, can someone confirm me if they are or not parfocal?

Thx.

Support@ZWO

Hi,

Different filters have different light bands, and each light band requires readjust focus.