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Old 28-10-2009, 05:38 PM
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Bassnut (Fred)
Narrowfield rules!

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Join Date: Nov 2006
Location: Torquay
Posts: 5,065
LX200R backfocus distance ?

I fitted 350mm of image train gear to the back of my LX200R 12" OTA, and to my supprise it still reaches focus, with adjustment to spare .

And it all works (rotator, focuser,AO8,OAGer,filterwheel,cam)

Anywayyyy, test stars look a bit bloated tho, got me thinking as to the max BFD on an SCT. Searched the net, nothin, except one comment that, unlike an RC, BFD was essentially infinite on an SCT (I guess the LXR qualifies as a modified SCT, having a corrector plate)?.

Based on test images, im a bit concerned now that a 350mm image train maybe somewhat longer than optimum, despite the ability to still reach focus. Anyone know if that might be the case?.
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