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Message: <blockquote data-quote="elkcub" data-source="post: 3116786" data-attributes="member: 14473">Hi Kimmo,Actually, the 10x42 IS L is the first Canon that's even approachable to me.  Every time I picked one up in the past the 14.5mm eye relief made me put it down.  Your measurements of the 8x42 SLC-HD are spot on, although my preference would be to measure the inside of the eyecup to get an idea of how much spectacle lens sag fits it.  For the SLC-HD the inner diameter is 30mm, and my guesstimate is that sag accounts for about 1.5mm of the 2.5mm drop from the inner edge to the eye lens.  Since the Canon's eye lens is also 23mm, the situation might be very similar.  The outside measurement of the eyecup is very important relative to the person's anatomy, as shown in the last attachment.  This is a problem I had with the Nikon 8x E2, although, of course, it might not be true for everyone.  I'll try to evaluate the Canon 10x42 IS when I'm in Palo Alto next time.  PS.  The effect of one's eyeglass prescription is still very significant and largely not understood.  But then, what can we expect if an operation like Allbinos doesn't even include ER in their rating formula?  It boggles the mind.Ed</blockquote>