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Richard, your photo is absolutely very nice. Color, star shape, sharp, focus, field. And with a DSLR.
As you ask for comments, I always shoot star clusters and some people ask me about sensibility (high ISO or long exposure) when the cluster vanishes beneath other stars in the field.
M7 is well because the main stars have high luminosity, but with others cluster this is a matter to care.
Globular cluster is another very difficult. Normally the core can suffer saturation.
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