Archived posting to the Leica Users Group, 2012/07/16

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Subject: [Leica] leica M9 diopters…..
From: steve.barbour at gmail.com (Steve Barbour)
Date: Mon, 16 Jul 2012 16:34:00 -0700
References: <E70A5A30-B70C-481C-86B2-C662D95FBE37@gmail.com> <CAE3QcF5vZiX-9kDmrkFLZrsGpi8H4AspDjHVi74a9=_SQnY20w@mail.gmail.com>

a wonderful, helpful response Geff, thank you very much,

Steve



On Jul 16, 2012, at 2:19 PM, Geoff Hopkinson wrote:

> Steve we once had a LUG member who was an opthamologist (I think). I'm not
> sure if he's still on board. You can try an archive search for some of his
> posts. I'll see if I can dig up the copies I made some time back.
> 
> The short answer is that it is best to try different diopter corrections
> with your camera to see what suits you personally. An
> Opthamologist/Optometrist or spectacles retail outlet should be able to
> assist. You should be able to look through your camera with a range of
> temporary lenses as used to determine spectacles prescriptions.
> 
> M camera viewfinders have Minus 0.5 diopter correction built in. This means
> that the image seen appears to be two metres in front of the camera.
> Dividing one metre by the diopter figure gives the focus distance (not the
> magnification).
> 
> Leica Correction Lenses are available in half diopter increments in a range
> for nearsighted to far sighted eyes
> 
> The best Leica Correction Lens for the individual is subject to several
> factors
> Your eye's accommodation, which is its ability to change focus from far to
> near objects. Declines with age.
> Astigmatism, which is a vision defect where light focuses on two different
> points within your eye. The spherical Correction Lenses cannot correct for
> this.
> 
> Are spectacles still to be worn with the Correction lens fitted?
> 
> Leica Camera also offer 1.25x and 1.4x Magnifier attachments which can have
> Correction Lenses fitted on the rear surface. Anecdotally these appear to
> also include some diopter correction. It would be best to test with the
> Magnifier on and off the camera when trying different diopter corrections.
> 
> On the actual hardware, you probably know that the Leica ones are hard to
> find and expensive. Not easy to find them in stock to try out before
> purchase. There's a Japanese variable one (WalterX) which is even more
> expensive and bigger too. It is meant to rotate to address astigmatism...
> maybe. I 'm not aware of any other brands.
> 
> 
> 
> Cheers,
> Geoff
> http://www.pbase.com/hoppyman
> 
> 
> 
> On 17 July 2012 06:41, Steve Barbour <steve.barbour at gmail.com> wrote:
> 
>> I am looking for advice re diopters for the M9....must the diopter be
>> leica, does anything else fit and serve as a replacement?
>> 
>> where can I buy them cheapest ?
>> 
>> 
>> How to determine what power diopter is the best fit for my eye,  with out
>> the benefit of trial and error with diopters of various strengths on the
>> camera.
>> 
>> 
>> thanks,
>> 
>> 
>> 
>> Steve
>> 
>> 
>> 
>> 
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>> 
> 
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information



Replies: Reply from von-ohlen at sbcglobal.net (Bill Larsen) ([Leica] leica M9 diopters…..)
In reply to: Message from steve.barbour at gmail.com (Steve Barbour) ([Leica] leica M9 diopters…..)
Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] leica M9 diopters…..)