Multi-diameter filter drawer

Askar Multifunction Filter Drawer

The Askar Multifunction Filter Drawer is designed to simplify the use of filters in astronomy and astrophotography, offering a versatile and practical solution for inserting different filters without difficulty. Here's a detailed overview of features, components and assembly steps to help you get the most out of it.

Features and functions

1. Compatibility Extended :
   • The drawer is compatible with 31 mm, 36 mm and 50 mm diameter unmounted filters, as well as with 1.25" and 2" mounted filters. This means you can easily switch from one type of filter to another without having to change equipment.
   • It incorporates interchangeable adapters (M42, M48, M54) to fit different telescopes and astronomy cameras, ensuring compatibility with the majority of available systems.
2. Robust construction :
   • Designed in CNC-machined aluminum, the drawer is strong and durable, with a smooth lining for comfortable handling. It also features a classic Askar logo to guarantee quality craftsmanship.
3. Sliding Filter System :
   • The drawer has different sliders for each type of filter. There's a specific slider for 1.25" and 31 mm filters, another for 36 mm filters, and a third for 2" and 50 mm unmounted filters.

Main components

• Main drawer body : It supports the filter slider and enables connection between telescope and camera.
• Filter slider : Interchangeable plate designed to carry filters, with threaded and grooved options for attaching mounted and unmounted filters.
• Filter fixing rings : Used to hold unmounted filters in place, securing their position during use.
• Telescope and camera adapters : Various threaded adapters (M42, M48, M54) for connecting the drawer to the telescope and camera.
• Screws and Tools : Countersunk screws and Allen keys (1.27 mm, 1.5 mm and 2 mm) to adjust and secure each component.

Assembly steps

1. Preparation:
   • Remove the main body from the drawer and select the appropriate camera adapter (M42, M48 or M54) according to your camera's thread.
2. Attaching the Camera Adapter :
   • Attach the camera adapter to the main body of the drawer using the M3×8 countersunk screws supplied, and tighten with the 2 mm Allen key.
3. Installing the Telescope Adapter :
   • Select and screw on the telescope adapter corresponding to your telescope thread (M42, M48 or M54). Make sure it's securely fastened.
4. Drawer connection :
   • Connect the drawer to your telescope and camera, checking that all connections are secure to prevent light leakage or misalignment.
5. Inserting the Filter :
   • Select the filter slider according to the filter diameter you wish to use. For unmounted filters, insert the filter into the circular groove and secure it with the retaining ring and M2×4 screws.
   • For 1.25" or 2" mounted filters, screw them directly onto the corresponding slider.
6. Adjustment and set-up :
   • Insert filter slider into drawer. Make sure the optical system is properly adjusted for the correct focus. You can add spacers if necessary to achieve optimum back focus.

Advantages of the Askar Multifunction Filter Drawer

The Askar Multifunction Filter Drawer solves common filter management problems by integrating adapters for the filters and equipment most commonly used in astronomy. Its design allows quick filter changes without misalignment, making the observing experience smoother and more enjoyable for beginners and professionals alike. This five-in-one system (with various adapters and sliders) meets the varied needs of users, greatly simplifying the set-up process for astrophotography and observation.