Askar multifunctional filter changer - filter drawer - 10-piece set

Askar filter changer - the filter drawer that grows with your equipment

Adapting a filter drawer to the telescope and camera is often quite an extensive task. And as soon as the camera is changed or a new telescope with different filter sizes is used, the game starts all over again. With this multifunctional filter drawer, ASKAR offers a solution for all common telescope and camera connections as well as for all common filter sizes.

The multifunctional filter changer consists of:

The base element to which the adapters on the camera and telescope sides are connected. This base element also accommodates the filter holders.

The filter holders with inserts for all common filter sizes. Three filter holders are supplied: one for 1.25" and 31 mm filters, one for 36 mm filters and one for 2" and 50 mm filters.

The telescope-side adapters with M42x0.75 (T2), M48x0.75 and M54x0.75 female thread

The adapters on the camera side with M42x0.75 (T2), M48x0.75 and M54x0.75 male thread

Suitable screws to fix the unmounted filters are also included.

Application tip from Teleskop-Service - How to achieve 55 mm working distance:

If you want to integrate an off-axis guider, we recommend the # ASOAGM54. With a normal flange focal distance of your camera of 17.5 mm, you will achieve exactly the 55 mm working distance with the off-axis guider, the # ASFD filter drawer and your camera that many correctors require.

If you want to work without an off-axis guider, you can reach the 19.5 mm with suitable extension rings and tuning rings. The following is an example for correctors with M48x0.75 camera connection and for cameras with 17.5 mm flange focal distance (e.g. cooled ZWO or TS-Optics cameras):

M48tuning ring2 ... thickness 1.5 mm

TSVF210 ... thickness 10 mm

TSVF208 ... thickness 8 mm

A small instruction manual for the Askar filter changer:

Please follow the steps below to successfully mount the Askar filter drawer and place it in the light path to fit the entire optical system:

1. Remove the main body of the Askar filter drawer.
2. Choose a suitable camera adapter according to the thread type of your astronomy camera.
3. Attach the camera adapter to the main body using 5 M3×8 countersunk screws and an M2 wrench.
4. Choose a suitable telescope adapter according to the thread type of your telescope.
5. Screw on the telescope adapter.
6. Connect the filter drawer and your telescope.
7. Connect your astronomy camera and the filter drawer.
8. Make sure that these accessories are firmly connected and that the whole system has a correct backfocus. You can add additional spacers (optional) to achieve the required backfocus.
9. Select an appropriate filter slider according to the filter you want to use. If it is a 1.25" or 2" filter, slide it directly onto the filter slider. If it is an unmounted 31 mm, 36 mm or 50 mm filter, carefully insert the filter into the circular groove and place a filter retaining ring over it. Fasten the retaining ring with 3 M2×4 countersunk screws and the M1.27 wrench to hold the filter securely between them.
10. Insert the filter slider into the Askar filter drawer and it is ready for astrophotography.

Safety informations: PDF Download