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35mm Camera Adapters and Accessories

Traditionally, because of the lack of standardization, attaching a 35mm camera to a telescope has meant resorting to the T-interface, which has an outer diameter of 42mm and an inner diameter dependent on the manufacturer's choice of tube thickness. However, many amateurs have found that this is the bottleneck in the light path to their camera which causes vignetting in the resulting images.

The Borg solution is to provide camera interfaces which utilize a 49.8mm (0.75mm pitch) outer diameter interface on the telescope side. This means that the smallest opening in the light path is typically the camera's bayonet mount, which is closest to the film plane, thus minimizing vignetting. Of course, to make full use of the Borg interface, you should be sure that your scope is capable of producing an image circle which can cover the 43.3 mm diagonal span of the 35mm frame.

Borg adapters provide a number of ways of connecting to both Borg and third-party telescopes. However, one of the most common interfaces is the 2" accessory interface, so this is the interface shown in the examples which follow.

 
Camera-to-2" interface

These photos show the Borg parts required to interface a camera to a 2" accessory port. The upper photo shows the component parts. From left to right, these are the camera interface (part number 5001-5009, depending on camera -- Nikon adapter 5003 shown), adapter ring 7000, and 2" nosepiece 7425. Refer to the camera interface table for specific camera models and interface model numbers.

The lower photo shows the assembled adapter.



 
Camera-to-2" Interface with 0.85x Focal Reducer

These photos show the Borg parts required to interface a camera to a 2" accessory port, including the Borg 0.85x focal reducer which is effective for scopes with focal lengths between 500mm and 800mm. The upper photo shows the component parts. From left to right, these are the camera interface (part number 5001-5009, depending on camera -- Nikon adapter 5003 shown), 0.85x focal reducer 7785, and 2" nosepiece 7425. Refer to the camera interface table for specific camera models and interface model numbers.

The lower photo shows the assembled adapter.



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