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SIDEREAL TRADING

on December 02, 2019

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SVBONY SV105 Review

by Tim Cowell The SVBONY SV105 sits neatly at the business end of my 71mm refractor and from looking at the specifications I wondered initially where and how it would compliment a telescope set up. It is sensitive, although its maximum stated exposure is just 500ms Supplied with a long USB2 'printer' type cable which is thoughtfully a 'double ender' type to ensure that there is enough power to run the camera from laptops and tablets, this camera is small and light. There is a paper instruction sheet included, a CD with a copy of SharpCap and it is packed in a neat box for safe storage. I think it is best practise to download drivers from the manufacturers website however this is a Plug N Play device and it loaded instantly for me. Fitting and using the SVBONY 105 is simplicity itself. I inserted the camera with the supplied nosepiece and once focused it produced a clear and crisp image of a distant tree on my PC screen. By rotating the camera until the USB ...

EAA & Nikon Z Adapter

1- I start experimenting EAA project. I temporarily set a proper filter into 183MC. First a lens I picked is Sigma 50mm Art. So my 1st attempt is wide-field EAA. About 135mm f.l. equivalent to full frame. Because of the live view or so, the speed is the key. My challenge is how I can achieve the quality image at F1.4 full aperture. I’m excited since this is my 1st EAA attempt. Let’s see the result although the moon is up these days. 2- This is the sneak preview for Nikon Z adapter which will be provided by BORG. It was displayed at last year’s CP+. Already one year passed. So I hope it will be commercially available soon. Nikon Z adapter(prototype) + 7000 + 7519(filter box) An another side is BORG M49.8. So 7392 or 7000 convert into M57. As mentioned earlier, this is one of big advantages in short-flange back cameras. Even a filter box is set, it is still less than 30mm long. With Nikon Z body (16mm), the total will be still quite close to Nikon F mount body (=46.5mm) So...

Celestron RASA Astrographs: Telescopes for Astrophotography

The RASA range of telescopes were developed specifically and exclusively for astrophotography. They are very fast; with a focal length of f/2 they take pictures twenty times faster than a Schmidt-Cassegrain lens at f/10! Because of this a tracking control is not required, and generally fewer demands are placed on the mount. The RASA 1100 model with a 279 millimetre aperture has already been on the market for some time, and Celestron is now also offering a smaller version, the RASA 800, with a 203 millimetre aperture. RASA 1100 RASA 800 The abbreviation RASA stands for the developers’ names: R owe- A ckermann- S chmidt- A strograph. It is basically a normal, routinely-produced Celestron Schmidt-Cassegrain instrument; that is with a spherical primary mirror in front of which is a corrector plate invented by Bernhard Schmidt. Instead of using a secondary mirror to direct the light path towards the Cassegrain focus at the end of the telescope, the camer...

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SIDEREAL TRADING

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