Tuesday, May 15, 2007

Borg 45ED II configuration

Since the lens cell of my Borg 45ED II can be connected directly to the 2" visual back, therefore, the whole drawtube assembly can be removed to increase the back focus, vignetting is not an issue for such a small objective.

I shall use this configuration to test the idea about using Herschel Wedge as a ERF, but then the PST-BF5 should be used for its higher transmission, I've tested a regular BF10 will not do, since it's simply too dark, it cuts too much light.

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