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Pentax PCF WPII vs. DCF HRII

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/11/2008 at 14:12
babymaker View Drop Down
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Is there much difference in these 2 regarding low light and clarity.  I note the PCF (8 x 40) is a porro prism and the DCF is a roof prism (8 x 42) and the DCF is a tad bit higher price wise.  I had just read that unless you pay a good bit higher that the porro may be a little brighter...
 
Thanks for any help.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/11/2008 at 15:18
Bird Watcher View Drop Down
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http://www.optics4birding.com/RevPentaxDCFHR2.aspx
In the price range you are looking at a porro prism usually suffers less light loss than a roof prism.


Edited by Bird Watcher - January/11/2008 at 15:19
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/11/2008 at 16:03
babymaker View Drop Down
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thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/11/2008 at 19:12
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All other things being equal (which of course, it never is) the porro prism glass would be brighter because it refracts the light fewer times.  Each time you refract light, you lose some of it.  Fewer refractions = less light lost. 

The porro prism model will also exhibit better image quality because its simpler design does not create the same challenges to which roof prism binoculars are prone. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/14/2008 at 12:08
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Here's something I read today, interesting reading if nothing else, especially the last part about porro vs. roof.
 
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