Conclusion: Canon EOS 40D - launched in 2007 - is still a great camera that is capable of giving outstanding results with a LM camera adapter/ LM microscope adapter
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Making Digital Camera Microscope Adapters
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Sony Alpha 5100 (DSLM) on the microscope – easy connection to either phototube or eyepiece tube with the LM microscope adapter solutions
Canon EOS 40D Review
Canon Eos 40D Microscope Application
What is a good entry-level DSLR camera with a flip screen? - Quora
Sony Alpha 5100 (DSLM) on the microscope – easy connection to either phototube or eyepiece tube with the LM microscope adapter solutions
Sony Alpha 5100 (DSLM) on the microscope – easy connection to either phototube or eyepiece tube with the LM microscope adapter solutions
Canon EOS 40D Review: Digital Photography Review
Revisiting the Canon 40D - Exceptional Build Quality and Performance for the Price