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Message: <blockquote data-quote="DRodrigues" data-source="post: 1418436" data-attributes="member: 55152">bird binoviewing with refractorsSome months already passed since my last post and, besides lack of time, one of the reasons for not posting  news about this was that I'm confused with some results and want to clarify them before.Regarding the Siebert PMW I adapted a cell reducer of 0.5x so got a "zoom" from 0.5x to 3.0x, so a 6x one. Zooming is not so handy as with a normal zoom and the eyepiece I like more to use on it is the Optolyth 31.5-10.5mm zoom. So can use the PWM to adapt the power range and use the zoom eyepiece when need fast zoom for reading a saddle. However there are some not so good details with the C5 that will explain latter.I already got a binoviewer but the 25% increase focal length mentioned in the web should be much higher and the use of the PMW designed for refractors increases even more this effect. So I thought of using a 100 - 110mm ED refractor with the material I have but was surprised when testing possible solutions today. Using the Vixen erector lens, the problem of using binoviewers is not lack of in focus but lack of out focus... (even worst if using just an eyepiece). That seems to result from the design of recent refractors for working with a star-diagonal, that need extra in focus travel...So using the Vixen erector means using extension tubes that result in a extremely long set-up. Will return to the C5 solutions testing...David</blockquote>

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