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Hi there - I'm a little confused - in the description at the top it says that from the front support surface to the image plane of the camera, this represents 55mm. However, this ring is only meant to add 8.3mm to the 18mm backfocus of e-mount cameras. That would give a total backfocus of 26.3mm...so my question is if I want to connect my e-mount camera to the back of a field flattener which requires 55mm backfocus, is this adapter enough, or do I need to add approx 28.7mm of spacers? Thank you and sorry for the long question.
Question by: Eshan on Mar 5, 2018 2:55:00 PM | 1 Answer(s)
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Details
The Sony Alpha 7 cameras – especially the 7S and 7SII – are very interesting for astronomical purposes because of their high sensitivity, short backfocus light weight and very compact body dimensions. We produce a very short T-adapter for Sony E-Mount/NEX bayonet, which adds only 8.3 mm onto the 18 mm backfocus of the camera housing. This enables an adaptation to all backfocus-critical systems like HyperStar or fast Newtonians. All other T-adapters with T-2-thread which are commercially available at the moment do vignett the light path. We have encorporated the well-tested system of our Protective EOS-T-Ring into the Sony-adapter: Besides the T2-thread, the design also includes an M48-thread – and even bigger – the outer part of our ultrawide S52-clamping system. We will soon offer a 2" nose-piece with S52-ring-clamp. This 2"-nose-piece does provide you with an unobstructed clear inner diameter of 46mm and eliminates vignetting with the Sony Alpha 7 cameras even with very fast optical systems. The Baader SONY-E-Mount/NEX bayonet T-Adapter already got introduced in our last newsletter.
Please check out the GIF-Ani which explains how to refit from T-2 to M48 (center) – as well as the gain in clear aperture (left/right).
Comparison of clear aperture of the Sony E/NEX T-Ring with T-2/M48 inner thread
Sony E/NEX T-Ring Scope of supply: Changing of T-2/M48 inner thread
Comparison of clear aperture of the Sony E/NEX T-Ring with T-2/M48 inner thread
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Additional Information
| Manufacturer | Baader Planetarium |
|---|---|
| SKU (#) | 2408317 |
| Optical length (mm) | 8,3 |
| Usage | zum Anschluss von (D)SLR Kameras an das Astro T-2 Gewinde |
| Camera Adaptable | Sony E/NEX |
| Inner Diameter / Clear Aperture (mm) | 41 |
| Outer Diameter | 60 |
| Inner Connection (lens sided) | S52, T-2 (M42 x 0,75), M48 |
| Outer Connection (eyepiece/-camera-sided) | Bayonet |
| Compatible Brands | Astro T-2, Baader Planetarium |
| Type of Adapter | Camera Adapter |
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