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The c14 I use for most of my imaging and visual astronomy is a 90s black tube and there’s no noticeable degradation. However I will say there are some advantages of new versions:
- slightly more efficient coatings
- better focus mechanisms and less mirror shift
- fastar compatibility to attach a Hyperstar
- less chance it’s sustained damage during cleaning or general use
But I don’t think any of these are deal-breakers. A good sct will stay a good sct for a long time if it’s been well cared for.
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