Originally posted by pdxfive So I spent 2 hours driving around shooting the supermoon from various angles and with different objects in the foreground, and ended up with about 50 shots altogether. Out of all those shots, only 1 was in focus, and that one just barely.
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HELP! I love photographing the moon and stars but without being able to get things in focus it's kind of pointless.
Originally posted by calsan --------
My guess is that the moon IS in focus, but you may underestimate just how fast the moon moves in the frame at 300mm - so if your exposure is 1/100 it will be smeared noticeably, which could look like an out of focus image.
For correct exposure on the moon, set the exposure mode to manual and try 1/250th, f8 and iso 100. If too dark, try either iso 200 or increase aperture.
I would also guess that the Moon was indeed in focus in many/some of the 50 exposures. However, it is not true that there will be motion blur at 300mm and a 1/100s exposure. It's a widespread myth - but only a myth anyway. The Moon moves approximately 350 degrees and always near the celestial equator during 24 hours. That is 0.004 arc seconds in one second of time. And at 300mm FL this produces a trail of 0.02mm - in one, full second. At a 1/100s the blur/trail will only be 0.0002 mm - which is a mere four percent of the pixel width of a K-5 sensor, (0.005mm pixel width).
The culprit is most likely poor seeing = turbulence in the air which tends to smear out fine detail. Add to that that at 300mm FL the moon diameter will only be 2.6 mm long on your sensor which corresponds to some 525 pixels on a K-5. So, to capture fine detail on the Moon 300mm just barely is enough to produce what may LOOK as a sharp picture.
The solution is finding an observing site with clean and CALM air + stacking and (preferrably) more focal length.
I may - somewhat immodestly - refer to my own experiences which I have described here:
Camera Settings for Astrophotography
Here's about what you may expect with a single shot (with a K-5 and a 350mm lens) and a bit of post-processing involving sharpening and contrast enhancement. Often, lack of contrast may be misinterpreted as "unsharp":
Stacking would have been better, but this is about what you could expect with a 300mm lens. Note that this image was taken with an 1/80s exposure time at ISO 80.
Don't give up! Lunar photography with a DSLR is a bit of a challenge but it is not impossible.