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Are BO/TMB Planetary parafocal??

Started by labguy321, 11/06/2006 03:13AM
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Posted 11/06/2006 03:13AM Opening Post
Ken Jachim
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Join Date: Jan 2001

Location: Depew NY, US

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I have the 5mm, 7mm and 9mm BO/TMB Planetary. The 5 and 9 are
parafocal (even with my other eyepieces) but the 7mm requires an annoying amount of infocus .
I know they are not advertised as being parafocal, but what are others
experiencing??? How about the other FL's? BTW nice for the price, sharp
to the edge, even the 9mm in my 10" F5 Dob!
Clear Skies,
Ken
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Posted 11/06/2006 03:44AM #1
Floyd Blue
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Location: Bakersfield CA, US

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Not truly parfocal no. smile There is some difference in the f/ls.
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[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue grin
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Posted 11/06/2006 04:50AM #2
Mike Hosea
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Location: Natick MA, US

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Just checked. In practical terms I would call my 7mm and 9mm parfocal. The 5mm required just a touch of out-focus from these other two, less than 1/8 of a turn of my Kineoptics HC-1 focuser.
--
Mike
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