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Forum: Photographic Technique
03-21-2017, 08:06 AM
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Dead John has it right for focussing.
Try an ISO of 400 or 800, as noted above. Your Orion nebula is overexposed.
You won't get diffraction spikes with your set up. The spikes you see in many astronomical photos really are due to diffraction from the struts (usually 4 of them in a cross pattern) that support the secondary mirror or the focus equipment in a reflecting telescope. With a standard camera lens, there are no struts to make the spikes! Astronomers would be just as happy to not have the spikes (although they are useful for astrometric measurements, where you can set your measuring equipment on the spikes).
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