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06-06-2015, 04:06 PM   #1
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Diopter for 67

Question about the 67 finder. I'm a tad near sighted(need glasses for far off) and with Nikon I have to get a +0.5 diopter for correct vision when focusing due to their finders actually being a -1 from what I read. That diopter does work as I swapped out the original with it and focusing is much better. My prescription is +1.25 minus the 1 for their finder puts what I need at +.25 but since those aren't made, the +0.5 works great.

Having said that, I'm assuming Pentax's finders are not like Nikon with the -1 finder so, another assumption is I can just try and find a +1 or +1.25 diopter for the 67. Is that a true assumption?

06-07-2015, 09:02 AM   #2
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The Pentax 6x7 & 67 metered/non-metered prisms have a -1 diopter.

You can get correction lenses for the 6x7/67 prisms in:

+2, +1, -1, -2, -3, -4, -5


Phil.
06-07-2015, 09:10 AM   #3
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That's the same way Nikon has theirs numbered...at -1. However, they "are not marked for their actual values, but actual values minus one, ie :

+1 is marked as 0
+1.5 is marked as 0.5
+2 is marked as +1
etc."

https://www.flickr.com/groups/nikonf2/discuss/72157633240457394/


That info from Sover Wong, THE man when it comes to the Nikon F2. Is Pentax the same way, actual values minus the 1?
06-08-2015, 09:17 AM   #4
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QuoteOriginally posted by ColColt Quote
Is Pentax the same way, actual values minus the 1?
If you use a correction lenses on the 6x7 or 67 you add them to the existing prisms viewfinder eyepiece. So my guess is that the value on the correction lens is with the -1 of the prism combined.

Phil.

06-08-2015, 09:31 AM   #5
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Nikon and Pentax seem to have the same viewfinder diopter, i.e., -1. I ordered a +0.5 for my F2A and it worked out great. From what I recall reading somewhere, a Nikon F100 diopter will fit the Pentax 6x7, 67 series perfectly. Perhaps I need to go that route since even finding a +0.5 diopter by Pentax would be difficult and the closest thing would be a +1 which may prove to be a bit strong.
06-09-2015, 08:40 AM   #6
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QuoteOriginally posted by ColColt Quote
From what I recall reading somewhere, a Nikon F100 diopter will fit the Pentax 6x7, 67 series perfectly.
Yes I have heard that as well, there was a post on the forum recently.

Phil.
06-15-2015, 12:08 AM   #7
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QuoteOriginally posted by gofour3 Quote
Yes I have heard that as well, there was a post on the forum recently.

Phil.
Re the F100 dioptric correction lens interchangeability with Pentax; well, maybe not. I tried it, and found it a smidgeon too loose, so returned it. I had a custom dioptric lens fashioned by my optometrist matched to my wonky eye.The biggest problem at the optometrist was getting him to put the BBB (Big Black Beastie) down: "God! I've never seen such a camera as big as that before...!"
06-15-2015, 08:39 AM   #8
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QuoteQuote:
"God! I've never seen such a camera as big as that before...!"
I venture to say that's what the bad guy in "Dirty Harry" would have said had he seen one..."My, that's a big one".




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