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Thanks again Andrew. So in theory a 4x barlow would give me f/19.2 which would be close. Maybe even a 5x at f/24. Just had a look and couldn't find any 4x barlows but there was a 4x powermate, bit more expensive and it was 2" not 1.25"- might be worth a try? Strange that stacking two 2x barlows didn't work as well as the 3x, but like you said earlier what I'm actually getting might be more than 4x with that set up. There was also a cheaper 5x barlow I could try too, and a 5x powermate.
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