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Hi,
An Esprit 100 is a great scope, but so is an ED120. When you say upgrade what do you mean?
I have an ED120, great for visual. I would consider ''uprading' to an Esprit 100 for astro photography, but would consider it a downgrade for visual. Of course image scale matters, and they will be different; but I think an Esprit 100 would allow the possibility of taking better photos.
My two cents
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