Altair 2″ Filter Holder T2-T2
The Altair 2″ Filter Holder T2-T2 enables connection to various T2 flatteners and reducers such as Lightwave Reducer/Flatteners.
Optical path length is 17mm, therefore you need to incorporate this amount in your spacing calculations.
Includes a 2″ filter holder/slider. Additional 2″ and 1.25″ Filter Sliders are available separately.
General usage and safety advice: Do not use for solar imaging to hold an ERF (Energy Rejection) filter or any other filter in front of Hershel Wedges. Filters are orientated correctly as shown in the product images, turning the filter slider around will impair the performance of your filter. When taking flat-frames before or after imaging, it’s advisable not to remove the filter holder or replace it, because this could cause changes in the position of dust particles which makes them difficult to cancel out. When taking darkframes in brightly-lit situations, it’s advisable to cover the filter holder and telescope focuser, or entire telescope with a dark cloth.