|
Bojan,
The Meade/ Celestron reducer is always an area of contention.
They have been used and abused for years. The "ideal" spacing doesn't seem to exist. 105mm or 115mm or what?
The reducer effect x0.63, x0.6 etc is independent of the optical corrections which may (or may not) be beneficial to the image.
I regularly use the x0.63 reducer for the spectrograph on the C11, but I'm more interested in the effective focal ratio/ length than any "corrections" the lens may give. (Working on the optical axis with a 20 micron slit)
I developed a spreadsheet to give the effective reduction based on spacings for both the x0.63 and the x0.33 reducers. (Measure the focal length of the reducer using the sun's image, just to verify!)
I also found the Baader website had a couple of images showing the effects of generic reducers at different spacings.
|