TheThing Posted August 29, 2023 Share Posted August 29, 2023 Hopefully, just a quick query. I've got a set of bino viewers and have picked up some pairs of eps now. I'm intending to use them with a 127 mak for '3D' views of the moon. Do I need to use a diagonal with them or will they reach focus without? Also, I assume that I can put a Barlow in front of the bino viewers and not have to purchase pairs of barlows? Thanks. Link to comment Share on other sites More sharing options...
Louis D Posted August 29, 2023 Share Posted August 29, 2023 3 minutes ago, TheThing said: Hopefully, just a quick query. I've got a set of bino viewers and have picked up some pairs of eps now. I'm intending to use them with a 127 mak for '3D' views of the moon. Do I need to use a diagonal with them or will they reach focus without? It should reach focus either way, but you're going to end up with a stiff neck without a diagonal unless the moon is really low to the horizon. Also, I assume that I can put a Barlow in front of the bino viewers and not have to purchase pairs of barlows? Correct. It's best to use a single Barlow ahead of the binoviewer. It will also keep the focus closer to the nominal design distance. Even without the Barlow or a 1.25" diagonal, you'll be operating at a longer focal length to reach focus due to the BV's 100mm+ optical path length, but still a much lower FL than with the Barlow. Thanks. See inline comments. 2 Link to comment Share on other sites More sharing options...
bosun21 Posted August 29, 2023 Share Posted August 29, 2023 You should use a diagonal for the comfort factor alone. You only require one barlow and the 127 will have no problem reaching focus. 1 Link to comment Share on other sites More sharing options...
TheThing Posted August 29, 2023 Author Share Posted August 29, 2023 Thank you kindly both. That's exactly what I wanted to hear! Much appreciated. Link to comment Share on other sites More sharing options...
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