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Hi Jonathan, personally I find the LX200R a great scope for both visual and photography usage. I am very pleased with mine in all respects, when I use it visually under good seeing conditions it gives very crisp clear views.
While I am no expert in this field I find that the UHTC really does enhance the view.
Sorry I cant comment on the LX 90 as I haven't used one.
Cheers
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