I was trying to take some Macro pictures of my agates and crystals but couldn't get my camera to focus; my camera is a Canon EOS 70D with a 70mm-300mm lens. I made sure that my lens was very clean and the veiw finder was just as clean, backed up 4 ft from my subject and still couldn't get it to focus . Here in Minnesota it is 85 degrees F and very humid today. Could that have something to do with my camera not being able to focus?
Thank you for your time.
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