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This is in summary 35,6mm because filters lay out the focus to extra focal caused by refraction through the filter. Rule of thumb is a third
of thickness of filter according to 2mm thick filter is roughly 0,6mm.
Do you have a compatible ring?
Is this ring compatible?
Thank you very much for your reply.
My goal is to get good photographs from planets, moon and maybe deep sky objects too. I know, that I need high quality optical elements between the telescope and the camera to achieve the goal.
I am going to buy Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp, Baader Hyperion Universal Zoom Mark IV, 8-24 mm eyepiece (1¼" / 2"), 9 mm and 17.5 mm Morpheus® 76° widefield eyepiece. VIP 2x modular barlow lens is also in my list.
What kind of adapters, extensiontubes and other finetuning products do I need to attach my camera to eyepieces? I think I need a new Baader Wide-T-Ring Canon R but what else to get good astrophotographs?
This way, you can match the f/ratio to the resolution of your camera.
We have described the adaptation of a camera to an eyepiece in this PDF: https://www.baader-planetarium.com/en/downloads/dl/file/id/444/product/1210/digiscoping_camera_adaptations_for_afocal_photography_and_eyepiece_projection.pdf
This will result in much higher magnifications than a barlow lens, so with a f/10-telescope, the barlow lens is usually the better choice (with modern cameras). On page 5 of this PDF, you can find a formula to calculate the best magnification depending on the pixel size of your camera.
For photographing the planets, we recommend a dedicated video module like the QHY planetary cameras https://www.baader-planetarium.com/en/cameras/qhyccd-kameras/planetary-and-guiding-cameras.html or the Celestron NexImage. The large sensor of a DSLR is not helpful when taking images of the planets.
It is fine for taking images of the complete moon or the (with an appropriate solar filter in front of the telescope) the sun. To attach your camera directly, you can use Baader SC / HD Ultra Short T-Adaptor, 7mm optical length # 2958500B (which limits you to the smaller diameter of the T-2-system) or you upgrade your telescope with a 2" eyepiece clamp like Baader 2" ClickLock SC/HD (2") clamp (C5" - C9¼") #2956220 and couple the wide T-ring with 2" / S52 Nosepiece # 2958551.
For Deep-Sky-photography, you should use an equatorial mount like an AVX - you could also purchase the wedge for the NexStar SE, but the AVX is a much better solution if you want to take photos. It is much sturdier and not that much more expensive than a SE plus wedge.
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|Net weight (kg)||0.05|
|Optical length (mm)||8,3|
|Camera Adaptable||Canon R Bajonett|
|Inner Diameter / Clear Aperture (mm)||41mm (T-2) / 48,3mm|
|Inner Connection (lens sided)||Thread, S52, T-2 (M42 x 0,75)|
|Outer Connection (eyepiece/-camera-sided)||Bayonet|
|Compatible Brands||Astro T-2, Baader Planetarium|
|Type of Adapter||Camera Adapter|
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