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John, I had a look at the Siebert and it looks impressive. They don't have the 5mm as you mentioned. I wouldn't be interested in the 7mm. However, i would be interested in the 9mm provided once i put an ED Barlow on it, i don't loose too much quality i.e. contrast.
Have you got a 9mm that you Barlow? How much quality does it lose?
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