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[OM] Re: Dealing with astigmatism through the viewfinder

Subject: [OM] Re: Dealing with astigmatism through the viewfinder
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 04 Nov 2008 11:29:25 -0500
I did try progressive lenses once.  I found them very disorienting and I 
couldn't wear them even for an hour.

Chuck Norcutt

Sue Pearce wrote:
> Chuck,
> 
> I have had progressive bifocals for about 10 years now, and am generally 
> happy with them. I don't seem to have any problem with finding the right 
> spot to look through into a viewfinder, b ut needed to change correction on 
> the cameras with adjustable diopters. The big problem is that since having 
> them, I haven't shot a single level horizon.
> 
> Bill Pearce
> ----- Original Message ----- 
> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> To: "Olympus mail list" <olympus@xxxxxxxxxx>
> Sent: Tuesday, November 04, 2008 6:07 AM
> Subject: [OM] Dealing with astigmatism through the viewfinder
> 
> 
>> Tom Fenwick asked me some usage questions about the Canyon EE-s focusing
>> screen I mentioned here recently.  That's the one that is designed to
>> improve manual focus but is recommended only for lenses of f/2.8 or 
>> faster.
>>
>> I had to beg off because I soon gave up using the thing because of poor
>> eyesight.  I have a fair amount of astigmatism in both eyes and, during
>> my most recent vision check a week ago I discovered that it has grown
>> worse and both eyes are now quite different from each other.  Up until
>> about 1-1/2 years ago I had been able to make do on manual focusing with
>> just a simple diopter adjustment... either a slip on for the early OMs
>> or the built-in diopter adjustment on the Mynolta A1, Canyon 5D and, the
>> most recent acquisition, an OM-4 from Moose.
>>
>> But now I have a different problem.  I can get away with hyperfocal
>> methods when using shorter Zuiko primes for landscape work but, as I
>> said in my reply to Tom, if I'm ever to use my manual focus macros again
>> (Zuiko 50/3.5 and Viv. S1 90/2.5 with 1:1 adapter) I'm going to have to
>> come to grips with the astigmatism.
>>
>> So my question is how do y'all recommend I do this?  A separate
>> correction lens for the viewfinder?  If so, how do I attach it and
>> account for the need for correct rotational positioning of a lens
>> designed for astigmatic correction?  Or do I just use my distance vision
>> glasses and adjust the diopter dial on the camera as needed.  I've also
>> just ordered my first ever set of bifocals.  They've not arrived yet.
>> Any problems with using them looking through the viewfinder?
>>
>> Thanks,
>> Chuck Norcutt
>>
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