Askar Multifunctional Filter Drawer

Askar Multifunctional Filter Drawer

Technical specifications

• Type: multifunction filter drawer

• Main body with smooth finish and Askar logo

• Main body function: holds filter drawer, connects telescope and camera

• Filter holder with threads and circular groove

• Small aperture holder: mounted 1.25" filters, unmounted 31 mm filters

• Medium aperture holder: unmounted 36 mm filters

• Large aperture holder: mounted 2" filters, unmounted 50 mm filters

• Telescope-side adapters: M42, M48, M54 threads

• Camera-side adapters: M42, M48, M54 threads

• Retaining rings for unmounted filters: three sizes

• M2×4 countersunk screws with 1.27 mm hex key for retaining rings

• M3×2.5 set screws with 1.5 mm hex key for spacing adjustment

• M3×8 countersunk screws with 2 mm hex key for camera adapter mounting

• Compatible with mounted and unmounted filters

• Direct optical path integration

• Adjustable back focus with optional spacers

Users are often faced with the difficulty of choosing and matching multiple filters and adapters when using a filter drawer. This becomes even more complicated for those who are new to astrophotography. To address this issue, Askar introduces a multifunctional filter drawer. Its main advantage is the integration of the most commonly used filters as well as telescope and astronomy camera adapters on the market. With this five-in-one device, users no longer need to worry about these constraints.

Assembly Steps

Users must follow the steps below to correctly assemble the Askar filter drawer and insert it into the optical path to fit the entire optical system:

1. Take out the main body of the Askar filter drawer.

2. Choose the appropriate camera adapter according to the thread type of your astronomy camera.

3. Fix the camera adapter onto the main body using five M3×8 countersunk screws and the M2 wrench.

4. Choose the appropriate telescope adapter according to the thread type of your telescope.

5. Thread on the telescope adapter.

6. Connect the filter drawer to the telescope.

7. Connect the astronomy camera to the filter drawer.

8. Make sure all accessories are properly tightened and that the entire system has the correct back focus. Additional spacers (optional) can be added to reach the required back focus.

9. Choose the filter slider suitable for the filter being used.

   • For a 1.25" or 2" mounted filter, thread it directly onto the filter slider.

   • For a 31 mm, 36 mm, or 50 mm unmounted filter, gently place the filter into the circular groove, add a holding ring, then secure it using three M2×4 countersunk screws and the M1.27 wrench to keep the filter in place.

10. Insert the filter slider into the Askar filter drawer: the system is ready for astrophotography.

Specifications

Basic Components

Main body of the Askar filter drawer
Function: accommodate the filter slider; connect the telescope and the astronomy camera
Features: smooth coating; classic Askar logo

Filter slider
Function: hold the filters; allow filter changes
Features: designed with threads and a circular groove for attaching both mounted and unmounted filters;
– the slider with the smallest opening is used for 1.25" mounted filters and 31 mm unmounted filters;
– the slider with the intermediate opening is used for 36 mm unmounted filters;
– the slider with the largest opening is used for 2" mounted filters and 50 mm unmounted filters

Telescope-side adapters
Function: connect the filter drawer to the telescope
Features: M42, M48 and M54 threads

Camera-side adapters
Function: connect the filter drawer to the camera
Features: M42, M48 and M54 threads

Filter holding ring
Function: securely hold unmounted filters
Features: three different sizes

M2×4 countersunk screw – M1.27 wrench
Function: fix the filter holding ring onto the filter slider

M3×2.5 grub screw – M1.5 wrench
Function: adjust the spacing between the main body and the camera adapter

M3×8 countersunk screw – M2 wrench
Function: fix the camera adapter onto the main body