As far as I know, BORG is the sole company who allows to add iris function into telescopes. Basically optical system must be modular design since iris should be set just behind the objective lenses.

1M57 for Series 60 and M75 for Series 80

2It has 20 blades!! Virtually round shape

Well-made!! Since it is virtually round shape, it creates beautiful BOKEH.

DSC08737s2Perfect match with Black BORG series, very cool!!

Iris allows to control the depth of the focus and the illumination without variable ND filter. These are very good value for image enhancement and make imaging process more fun.




~ by tedishikawa on February 24, 2013.

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