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Old 21-02-2020, 08:00 AM
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Don Pensack
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Join Date: Aug 2006
Location: Los Angeles
Posts: 390
The Paracorr can be moved in and out with the focuser if an eyepiece needs to move in a bit more (like the 20mm 100 Explore Scientific, for example).
The SIPS, though, is like having a fixed Paracorr. If the eyepiece needs to move in, you bottom out. The only solution is to move the SIPS lens a bit farther away from the focuser (usually possible). You will need to "reoptimize" its position once removing that eyepiece and going back to your other eyepieces. A tiny white mark on the edge of the lens and its housing can easily facilitate that.
So, it's not impossible to use the SIPS with the 17mm Nikon, just a bit more difficult than using the standard Paracorr.
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