My first assumption is that the only function of the tunable top is to maintain a more or less constant distance from the eyepieces field stop location to the Paracorr's lens group, with deviation from this optimal distance leading to somewhat less than optimal Paracorr performance. Part of my difficulty in making my spreadsheet (see above post) is that I have sold my Paracorr, and I can not measure this distance, and therefore must guess. I must also guess at the height range provided by the tunable top, and my guess here was 1/2 inch.
TeleVue gives us a chart (reference my first post in this thread for the link) of optimal Paracorr settings, but for 1.25" eyepieces this chart is seriously flawed by the fact that apparently 2 quite differing heights of TeleVue 1.25" to 2" adapter are (or at least were) available for the Paracorr, and the TeleVue table does not specify which adapter they used for the chart. Whichever adapter they used, if you have the other one, then the TeleVue chart is pretty much useless in providing you with the best setting for your 1.25" eyepieces.
One of the adapters has a set-screw which fits into a recessed slot, and is thus of a low profile, and the other adapter does not, and is therefore high profile. Both are pictured along with the Paracorr's as seen above the TeleVue website Paracorr tunable top chart.
Most budget after market 1.25" to 2" adapters are of the high profile variety.
-------------------- My philosophy, in essence, is the concept of man as a moral being, with his own happiness as the moral purpose of his life, with productive achievement as his noblest activity, and reason as his only absolute.
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Re: List of Paracorr settings for all brands of EP
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