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Also, 2x Teleconverter is also barlow (if you do not mind M42x1mm thread).
I have Zenit tele extender, it is 4-element system, it was quite cheap on rugift.com ~10-15 years ago
It can be boosted to 5x with just longer extension tube between camera and converter ( I can not say if it is better or worse than much-more-expensive TeleVue Powermate, but I can tell I havent noticed even a hint of CA (contributed by converter) when using it on planets last year).
Last edited by bojan; 12-07-2019 at 10:54 AM.
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