[Tweeters] Spotting Scopes and Binoculars - Caveat

Reginald David rdavid at ilhawaii.net
Mon Dec 16 15:21:05 PST 2013

Aloha Doug,

Well said sir, this is a question I get asked fairly frequently, and it really does come down to personal testing and preferences with the obvious caveat, that the optic you are comparing need to be within the same quality category.


Reginald David
Rana Biological Consulting, Inc.
P. O. Box 1371
Kailua, Kona, Hawaii 96745-1371

329-9141 Phone
937-0124 Cell
rdavid at ilhawaii.net
Please consider the environment before printing this email.

On Dec 16, 2013, at 11:54 AM, Doug Will <diwill at uw.edu> wrote:

> Caryn,


> Objective optical testing can determine the "best" scope or binocs in

> some theoretical sense for perfect human eyes.


> However, few of us have such "perfect" eyes.

> Even with glasses or contacts correcting primary refraction errors

> (spherical correction) and secondary errors (cylindrical, often called

> "astigmatism"), tertiary refraction errors make it imperative to try out

> optics yourself before purchase.

> A visual comparison of several high quality scopes at a place like

> Seattle Audubon is essential.

> In particular, try out the scope you are considering buying against

> several other high quality scopes.


> Doug Will

> Sr Research Engineer

> UW Seattle


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