Funny enough after another thread on here I was reading Vic Maris's (Stellarvue telescopes) thoughts on exactly this topic.
It is really a hard question to answer but to paraphrase him, a very well figured objective of "ED" glass is likely to outperform a mass produced and only "OK" objective of FPL-53 or similar. Snip from this page below.
https://www.stellarvue.com/optical-glass-types/
Quote:
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Glass type is not the most important thing: When someone chooses a relatively inexpensive, mass produced telescope because it is advertised as using FPL53 over a telescope using FCD100 that is much more accurately figured, the customer is clearly using the wrong criteria to determine quality. Let's imagine the less expensive telescope focuses 90% of the light where it is supposed to go and the other focuses 99% of the light where it is supposed to go. Choosing the less accurate optic simply because it uses a particular glass type is silly when both glasses are equivalent. The difference between two telescopes under a steady sky will be obvious. In this case the FCD100 telescope will win, not because it has better glass but because a lot more time has been spent to bring it to a higher standard.
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