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Where to position bifocal on a mask?

Started 10 months ago | Discussions
PHXAZCRAIG
PHXAZCRAIG Forum Pro • Posts: 19,651
Where to position bifocal on a mask?

I'm about to mark up and send back a mask to have lenses glued in.  I have to mark my pupil position (easy), and I have to mark how high up the bifocal part needs to go.

I've never had bifocals in a mask before.  I have no clue how high they should go or why.   I'm tempted to go with the default (10mm below center if no preference).

Should I have a preference?   Anyone else had bifocal lenses put in a mask and have advice for positioning such?

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Phoenix Arizona Craig
www.cjcphoto.net
"I miss the days when I was nostalgic."

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PHXAZCRAIG
OP PHXAZCRAIG Forum Pro • Posts: 19,651
Re: Where to position bifocal on a mask?

Feedback for anyone looking at this thread in years to come.

I got the mask, and it's (mostly) wonderful.  However, I do wish now that I had marked the bifocal line lower as it cuts across my field of view annoyingly.  (I'm getting used to it after 11 dives.)  The optics are great - I can see!  The bifocal part is nice, but it seems I didn't need it as much as I thought, but it's early days.

If you are looking at the middle of a computer screen, the bifocal section covers the bottom 20%.  It could be 10% and work fine.

Be nice to have next time I see Wire Shrimp.

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Phoenix Arizona Craig
www.cjcphoto.net
"I miss the days when I was nostalgic."

 PHXAZCRAIG's gear list:PHXAZCRAIG's gear list
Nikon D80 Nikon D200 Nikon D300 Nikon D700 Nikon 1 V1 +45 more
PHXAZCRAIG
OP PHXAZCRAIG Forum Pro • Posts: 19,651
Update - I like it the way I got it

PHXAZCRAIG wrote:

Feedback for anyone looking at this thread in years to come.

I got the mask, and it's (mostly) wonderful. However, I do wish now that I had marked the bifocal line lower as it cuts across my field of view annoyingly. (I'm getting used to it after 11 dives.) The optics are great - I can see! The bifocal part is nice, but it seems I didn't need it as much as I thought, but it's early days.

If you are looking at the middle of a computer screen, the bifocal section covers the bottom 20%. It could be 10% and work fine.

Be nice to have next time I see Wire Shrimp.

At first the bifocal line cutting across annoyed me.  It's like the lower part of the mask filled with water.  But once I got used to it, I found it very handy indeed for cruising close to the bottom (3 feet), where I see clearly what's passing underneath.  Struggled just a bit before,.

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Phoenix Arizona Craig
www.cjcphoto.net
"I miss the days when I was nostalgic."

 PHXAZCRAIG's gear list:PHXAZCRAIG's gear list
Nikon D80 Nikon D200 Nikon D300 Nikon D700 Nikon 1 V1 +45 more
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