Product Details
The improvement to the image field of the 103APO when combined with the 1x full-frame field flattener is noticeable, and makes this a must-have accessory for those wanting to use the 103APO for astrophotography. It features M54 and M48 threads which allow connection to a variety of cameras. It also has an internal M48 thread to accept 2" filters to get even more out of your images. The body of the flattener is CNC machined and comes with threaded metal caps for each end that prevent dust or damage to the optics when not in use.
A Full-Frame Flattener for Astrophotography
This 1x flattener features a three lens optical configuration (triplet). At 1x, this flattener does not alter the focal ratio of the 103APO, but provides a flat field suitable for astrophotography. The total weight is just under 1.3 pounds. The front thread of the flattener is M84x1. The camera end of the flattener has M54x0.75 and M48x0.75 threads. There is also a built-in M48x0.75 2" filter thread. The backfocus from the M48 thread is the standard 55 mm. The focal length of the 103APO after installing the flattener is 700.4 mm.
Installation Step 1
Installation of the 1x field flattener to the Askar 103APO is simple. Unscrew and remove the 2" and 1.25" adapters. See adjacent illustration.
Installation Step 2
To complete the installation, unscrew and remove the dust cap of the 1x field flattener. Then screw the field flattener into the 103APO. Before attaching a camera, you may also install a 2" filter to the field flattener using its internal M48x0.75 threads.
Specifications:
- (After attaching) 103APO Focal length: 560.32mm
- (After attaching) 103APO Focal ratio: f/5.44
- Lens Number: Triplet design
- Back Focus: 55mm (from the base of M48 male thread）
- Weight: 0.48kg
- Rear-end thread type:
- M54×0.75
- M54×0.75-M48×0.75 (M48×0.75 filter thread inside)
Other Information
- Country of Manufacture: China
