New 800 mm 5.6 using fluorite?

Started Jan 29, 2013 | Discussions thread
Geomaticsman
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Re: New 800 mm 5.6 using fluorite?
In reply to Camillo, Jan 29, 2013

Camillo wrote:

Canadianguy wrote:

Here is what the Telescope forums have to say about Fluorite vs ED Glass...

http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Board/refractors/Number/4135855/page/172/view/collapsed/sb/5/o/all/fpart/2

Most intriguing thank you for sharing that.

The question is, who ya gonna believe? Nikon clearly labeled the ED as superior and the fluorite as inferior to ED and now suddenly out of no where, here you go how about some flourite? that'll be 18,000 thank you.

Fluorite is harder to work with (brittle) and is more susceptible to temperature changes, but it is very effective at controlling CA. Premium ED glass can be as effective (e.g. FPL-53) but needs to be used in combination with other elements which can make the lens cell (optical train) heavier.

There's no clear right way or wrong way, it's all in the details.

Right now, however, it appears to me Canon has a clear leg up on Nikon as far as optical quality/weight ratio is concerned. If Canon can ever figure out how to do sensors right, I'd be on the other forum.

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Gary -- Some Nikon stuff -- and a preference for wildlife in natural light
www.pbase.com/garyirwin
http://photographersonlinemagazine.blogspot.com

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