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Increased magnification and tube currents
may be my question has been misinterpreted. I wasn't after the actual value. Just wanted to have an understanding of what occures when the camera is moved away from the Powermate by the thicknes of the filter wheel, does it increase the magnification. It is similar to a long tube 2x Barlow. Although I haven't tried it, I have wondered if by moving the tube further out of the focuser it would increase the magnification without distorting the optics. Reference to tube currents. My 10 inch GS has been converted into a truss Dob. see 250 Light Bucket IIS. The lower tube section is about 500 mm in length. The suplied fan draws the air from the tube. I improved this with a cover and edge seal preventing the air flow from being drawn other than from around the mirror and tube. When deciding on a viewing evening, the scope is taken outside located in shade and the fan switched on and left running while recording. Would Tube currents still be a concern?
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