M1-M4 mask differences?

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hedgehog47

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Location
Lake Worth, FL
# of dives
500 - 999
obviously the shape is different slightly but are there any other changes between the two masks ? thanks!
 
obviously the shape is different slightly but are there any other changes between the two masks ? thanks!
Other than size, Hollis claims the M-1 has "Ultra Clear Glass" and the M-4 has "Standard Glass." I dive an M-4 as my primary, and an M-1 as my backup, but I haven't noticed the slightest difference between the two in terms of quality.
 
Same here, I use the M1 my main and store my M4 for backup. I don't see much of a difference.
 
thanks, I really like the shape of the m4 better but im currently using the m1.

any hollis reps on there with a comment ?

---------- Post added January 13th, 2015 at 04:24 PM ----------

so do you think the "ultra clear glass" is a gimmick ?
 

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