hello Eternity,
agree with Mike ,but just be a little careful,especially early morning /evening,but generally people either ignore you or have a chat..... strange but true especially around buildings/private property etc you will get more grief from security guards,but tend to find humour works...lol
As to people thinking and wondering what you are doing ,as Mike said get your shot , only you know what you are trying to achieve,so other people in that respect don't matter...
But always enjoy...
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Lee 
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