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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 threadAll Baader Wide-T-rings have an S52 dovetail in addition to the inserted T-2 ring. This allows the T-ring to be modified to an M48 female thread using the S52 / M48 adapter #2958552, or to use the S52 barrel #2958551 without the T-2 reduction. With the S52 / M68 adapter # 2458252, the Wide-T-Ring can be directly attached to an M68 male thread to securely fasten your camera to the widest possible aperture.
All Baader Wide T-rings can be directly adapted to an UFC (Universal Filter Changer) with the optional Baader UFC S52 dovetail camera-adapter (#2459119), in order to change different filter sizes directly in front of the camera sensor.
With the ultra-short Backfocus of only 26.3mm (18mm camera, 8.3mm T-2 bayonet ring) many adaptations in combination with reducers / filter wheels are now possible for the first time. Furthermore, the illumination of the camera chips improved significantly, mainly because of the larger clear aperture.
Related Articles
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Baader Universal Filter Changer (UFC): Simple photographic use example (Part 7)
Photographic Use Example: We've been asked a few times recently on how to set up the Baader UFC for use with a DSLR and a range of wide-field imaging refracting telescopes. So we thought we would write a short blog on some ways this can be done. Let us start from the telescope side first. All the enquiries we have had, the wide field refractors have 2" barrel focusers, so there is our starting point. The telescope side of the UFC Base (to which everything else in the UFC system is connected to) uses Baader's S70 dovetail adaptors to allow the UFC to fit to telescopes. Looking at the UFC main diagram above Baader do a Baader UFC S70 / 2" SC-thread (f) Telescope-Adapter (optical height: 1 mm) (#2459128 , € 25,-) that allows 2"/SC male-thread accessories to be used. More about our UFC Telescope Adapters can be found in our blog: The UFC telescope-side adaptors. We offer our or our Baader 2" Safety Kerf nosepiece with 2" filter thread (#2408156 , € 43,-) . The image below shows the latter 2" nosepiece attached to the UFC S70 2"/SC adaptor. Using one of these will allow the UFC to be attached...
Additional Information
| Manufacturer | Baader Planetarium |
|---|---|
| SKU (#) | 2408317 |
| EAN Code | 4047825034571 |
| Net weight (kg) | 0.04 |
| 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) | M42 x 0.75 (T-2), M48, S52 |
| Compatible Brands | Astro T-2, Baader Planetarium |
| Type of Adapter | Camera Adapter |
(Size: 1.8 MB)
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