Re: [OM] IMG: Sunrise, Moonset

[Wayne Harridge]

Dunno if it's been done but one of the camera processors should be able to
calculate DOF (at least the simple geometric based calc) and display it in
the viewfinder.

...Wayne


-----Original Message-----
From: olympus
[mailto:olympus-bounces+wayne.harridge=structuregraphs.com@xxxxxxxxxxxxxxxxx
] On Behalf Of Ken Norton
Sent: Tuesday, 21 October 2014 6:25 AM
To: Olympus Camera Discussion
Subject: Re: [OM] IMG: Sunrise, Moonset

> Nothing like a little math to obfuscate things. I never did get the 
> hyperfocal thing. We were lead to believe that everything between the 
> marks was "in focus". In or out. Kinda digital. But when you turn the 
> focusing ring what you see is definitely analogue. What is magical 
> about those little marks? Well maybe it was the limitations of the 
> media and equipment of the day. I think that "hyperfocal" is a 
> carryover from the past that may not have much relevance with today's 
> technology. The hyperfocal spread is shrinking as the technology 
> improves to the point where it becomes meaningless. Maybe that's why the
markings disappeared.

DoF is an output-based calculation. It has to do with the reasonable
appearance of sharpness to the normal human eye (as opposed to the Moose
Eye), in an 8x10 print at normal viewing distances. Personally, I find that
adding one stop to the hyperfocal markings is a little better for me as song
as I'm not punching up too hard into diffraction blurring.

As to the disappearance of the markings, I'm a whole lot more cynical.
The markings disappeared with second-generation autofocus systems that no
longer focus the lens through a helicoid and extension, but through the
changing of the effective focal length of the lens (internal lens movement).
Without a big rotating barrel and a very minimal movement in the focus
mechanism itself, the ability to adequately display DoF markings in any
usable way has been eliminated. Fuji has done a good job, though of bringing
back some of this within the viewfinder with distance-scale focusing.

AG
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