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Just a comment:
The Orion Shorty Plus is an ED Barlow no longer in production.
I've been testing various Barlows (for use in spectroscopy) and found the TMB x1.8 was the best, followed by the Orion Shorty +.
I can strongly recommend it.
(The next step up is the $$$$ Powermates - which I also use)
The five element Super Plossl is a step up from the average Plossl.
Just my 2c
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