![]() Using my Sony a6400 aps-c crop frame camera and my Sony 100-400 lens at 400mm and f/5.6, what sort of exposure time should I use for shooting a deep space object like the Orion Nebula? And should I take multiple exposures and stack them in software like Startracker? (I've played around with Startracker and know a little bit about these things, but not much.) Looking forward to my iOptron tracker to arrive any day. I'm not certain the "full package" as sold there includes the pictured tripod (the description doesn't mention it) but a sturdy tripod is certainly needed. You'll need (or should have) the full package with a small counterweight to balance that Sigma telephoto lens, just like shown in the photo on the linked page. I have never used one but I consistently see good reviews (like this one and this one ) and good results from this tracker. Very good advice! Of the trackers on that page I would recommend to the OP the first one currently listed there: the iOptron SkyGuider Pro Camera Mount - Full Package. In his tutorial section, he has a number of articles relevant to imaging with just a camera and lens. To get a better idea of what you'd need, and how to use it, you might take a look at That's the website of Jerry Lodriguss, who contributes to this forum and a few others. They can be captured in surprising detail with camera lenses a lot shorter than 600mm, IF you have accurate tracking that allows long exposures. Many very impressive deep space objects, such as the Andromeda Galaxy, Great Nebula in Orion, Horsehead and Flame, North American Nebula, and Rosette Nebula (to name just a few), are of relatively large angular size. With a relatively inexpensive camera tracker mount that tracks in equatorial mode ( here is one page listing several) you have more targets within your reach than you probably realize. Your camera lens, however, is a telescope you already own. That mount is incapable of equatorial tracking, which is what you need for most astro imaging. The scope itself would require modification to make it work at all, and imaging with its original mount, as a practical matter, would be limited to the moon. The one you've suggested won't work as it's delivered. Just in case the other responses need amplification, you're not likely to find a telescope and tracking mount suitable for astrophotography within the budget you've specified. There are a quite a few threads on this forum about trackers. Save your money and buy a tracker mount for your camera and existing lenses instead. ![]() That alone, new, would be more than your budget. It's a 500mm f/4.4 in photographic terms so you would need a good equatorial mount with a polariscope to get good results with it, even for something like the Andromeda galaxy. ![]() I'd forget about that for photography, it's an optical telescope, not a photographic one. I've been looking at one with a motorised mount, perhaps this one: I have a Nikon d7200, and looking to upgrade to the d750. I'm looking to buy a telescope which I can attach my camera to so I can take better photos of the moon, stars and possibly planets. I have taken photos of the moon using the Sigma 150-600. I love looking at astrophotographs, and would like to have a go myself.
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