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Looks very good for a lens shot, no chromatic aberration. With lenses I tend to focus by the numbers. As you've pointed out the aperture is too small to use a bahtinov mask effectively. Using Nebulosity and picking a bright star you can check the numbers and focus accurately this way provided the seeing is not too bad. Then I tape the barrel of the lens with electrical tape across so it locks it in focus, then stick a pack of hotties on top and bottom then finish off wrapping it with a sock. That usually gives me 8h to 10h of passive heating and that's good enough to last the night.
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