Ken James - Snake Valley, Australia - 12" Dob | ED80 | 120mm Achro | 6" Achro | Modded Toucam Pro II | Canon 350d | Samsung SCC-A2333 Video Camera | Mallincam Xtreme video Camera | My CN Gallery | My site: Ken James Astrophotography | President-SVAA Broadcaster on NSN as 'SNAKE VALLEY AUSTRALIA'
LX 200 GPS 14in. Mallincam Extreme , Northhills Observatory
JimT iOptron iEQ45 ES AR 152 Mallincam X2 NON Astro Related 2 Saint Bernards My Web Site is www.nightskiesnetwork.com My Channel name N S N Observatory
Quote:Just like to add an important information:High focal reduction has a steep light cone. To fully illuminate an image sensor, you'd like the objective lens (e.g., donated from a 7x35 bino) as large as possible.You might find I try to use a larger lens (to avoid optical vignetting), then the medicine bottle (in the shape of reducing profile gradually) to avoid physical vignetting. Clear Skies!ccs_hello
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Quote:css_hello,Is your spreadsheet publicly available? I mean the worksheet with the formulas, not just the screen shot.Glenn,Why is that? Can't I make reduction more aggressive by increasing the distance between the reducer and the sensor?Thank you,--Dom