Altair 2 inch Magnetic Filter Holder - M48 Version 2

Altair 2" Filter Holder with male M48 thread on the rear and M48 female thread on the front.

Includes one 2" Filter Slider.

Note: Order extra version 2 sliders to fit Version 2 Magnetic holders because they have the correct polarity.

• Enables connection to various M48 flatteners and reducers, such as Altair PlanoStar or Starwave, which have M48 male threads, and Altair M48 DSLR camera adaptors.
• Optical path length is 17mm, therefore you need to incorporate this amount in your spacing calculations.
• The maximum height the filter can protrude from the surface of the slider is 6.85mm. The threads of the filter are buried, therefore this measurement does not include the threads of the filter. There is allowance for maximum filter thread depth of 3.6mm.
• Includes a 2" filter holder/slider. Additional 2" and 1.25" Filter Sliders are available separately.

Compatibility:
Compatible with Altair TriBand, QuadBand, and 2" filters, Altair 2" Narrow-band filters and most other brands using an M48x0.75mm filter thread.
Rear male M48 thread compatible with Altair M48 Nikon or Canon DSLR adapters.
Front female M48 thread fits directly to the Planostar M48 reducers and flatteners.
Starwave M48/T2 Spacers and Extensions are also compatible allowing you to make up the correct spacing between camera sensor and optics.

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.