To my mind, there are several magic thingies.

First, field of view report. Pretty handy as you learn the right distance and 
alignment for your pictures. Add the tilt sensor, so you can learn when your 
phone is flat relative to your document.

Second, the KNFB people know that we're pretty lousy at taking pictures. Or, 
well, "variably talented", perhaps. So they've done a lot of work to optimize 
pictures to account for all the stuff we can't account for, in as much as is 
possible. I don't think the less expensive apps do either of these things as 
well. 

Of course, if you can find something for less that works for you, by all means 
use that. For my part, I've tried a couple of less expensive alternatives and 
have found them wanting.

-- 
Buddy Brannan, KB5ELV - Erie, PA
Phone: 814-860-3194 
Mobile: 814-431-0962
Email: bu...@brannan.name



> On Sep 20, 2014, at 11:47 AM, Sabahattin Gucukoglu <listse...@me.com> wrote:
> 
> All right.  Yes, it's all very wonderful
> 
> The question is: why?  Why have all the other apps failed?  What's the magic 
> sauce?  You know me--well, you do now, anyway--that I'm not going to be happy 
> unless I've established that £69 was worth paying.  I'm still not quite 
> convinced that it is, yet.  £69 is a lot of money for an iOS app, and my 
> first thought while reading the description was, "Yeah, highly anticipated 
> and bloody expensive!"  Anybody have answers, or even hypotheses?
> 
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