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<blockquote data-quote="BF Hammer" data-source="post: 825342" data-attributes="member: 48483">Without checking on Stellariun first, the FOV all looks about right to me. The physical dimensions of the sensor is what factors into the FOV so 2 full-frame sensors with the same lens create the same FOV. But the higher res sensor will have more detail recorded.From practical experience, 600mm or higher is good for Orion nebula, but wider if you want the surrounding nebulas included. I have had some interesting composition of the entire constellation of Orion with a Tamron 90mm. Andromeda Galaxy frames up nicely at 400mm.20mm is good for a Milky Way landscape image, but even wider is normally desired. It is why I was good with selling my Sigma 20mm f/1.4 after getting my 15mm f/2.8. In addition to the Zeiss gives a spectacular flat field image.My current favorite DSO lens is a 70-200mm f/2.8. When I bought it i was thinking more about filling a gap between a 24-120mm and my 150-600mm, wondering if I really needed it. Turns out I do need the lens.</blockquote>

[QUOTE="BF Hammer, post: 825342, member: 48483"] Without checking on Stellariun first, the FOV all looks about right to me. The physical dimensions of the sensor is what factors into the FOV so 2 full-frame sensors with the same lens create the same FOV. But the higher res sensor will have more detail recorded. From practical experience, 600mm or higher is good for Orion nebula, but wider if you want the surrounding nebulas included. I have had some interesting composition of the entire constellation of Orion with a Tamron 90mm. Andromeda Galaxy frames up nicely at 400mm. 20mm is good for a Milky Way landscape image, but even wider is normally desired. It is why I was good with selling my Sigma 20mm f/1.4 after getting my 15mm f/2.8. In addition to the Zeiss gives a spectacular flat field image. My current favorite DSO lens is a 70-200mm f/2.8. When I bought it i was thinking more about filling a gap between a 24-120mm and my 150-600mm, wondering if I really needed it. Turns out I do need the lens. [/QUOTE]

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