[Leica] Coded or non coded lenses, that is the question ADAM!

[tedgrant at shaw.ca (tedgrant at shaw.ca)]

Adam my dear on screen friend! :-)
Thank you so very much for putting it into a language I can understand! :-)

Actually the best teaching & me learning! :-)  I've ever had on this coding 
aspect explained to me. Thank you most sincerely for your understanding of 
the old lad and my un-educated state. However! Now I'm more understanding of 
a technical aspect I never understood before!

Bless you! The rant button has been silenced! Well until? ;-) ;-) Oh heck 
you know these days and an "OLD FILM USER FOR OVER A HALF CENTURY?" There's 
bound to be somethng new that'll throw me into a snit state!  :-) Although 
I'll try harder to sort of bite my tongue / typing fingers and save the LUG 
from another of my screaming rants once again!" :-) :-) :-)

cheers,
ted


----- Original Message ----- 
From: "Adam Bridge" <abridge at mac.com>
To: "Leica Users Group" <lug at leica-users.org>
Sent: Tuesday, April 08, 2014 3:52 PM
Subject: Re: [Leica] Coded or non coded lenses, that is the question ADAM!


> Hi Ted,
>
> With our M8's it's not so much of an issue because the sensor is smaller. 
> The weird things happen out at the edges where the light comes in at a 
> steeper angle.
>
> When you think of a sensor on a digital camera you need to think of the 
> light-sensitive part living down in a pit. Sort of like you're standing at 
> the bottom of a well looking up at the sky. Light from the back of the 
> lens spreads across the sensor. If you're in the middle then you get all 
> the light. But out the edges the light hits the side of the pit and 
> doesn't make it to the bottom.
>
> The answer is to put a small lens (they call them "micro-lenses" at the 
> top of the pit which gathers the light and directs it down to the bottom. 
> But the design of that lens would have to be different for each lens you 
> mount on your camera. What to do? Well, every camera has a small computer 
> in it to handle taking the electronic information from each little sensor 
> location and using that in some rather complex ways to organize it into a 
> "picture" that makes sense. If the computer knows that you've got a 24mm 
> f2 lens on it can adjust for both how the light from the lens reaches the 
> sensor at the bottom of each pit AND it can even adjust for known problems 
> in the design of that particular lens!
>
> Of course with film this isn't a problem. With black and white film the 
> layer of light-sensitive particles is very thin while for color the 
> different layers are still very thin - no pits!
>
> I hope this helps. I could probably do a neat little illustration if it 
> would help you.
>
> It IS very complicated. We're still at that awkward phase of technology 
> where exactly how to do the engineering is being worked out in an almost 
> minute by minute advance. Film, however, has been a mature technology for 
> decades. Now, if you had started out in photography in the 19th century 
> you'd have done much the same except you'd be worried about wet plates, or 
> dry plates, or film, or different formats. That all settled down with a 
> few formats and lots of well-understood chemistry to make it all happen. 
> Just think about the different developers used on something like Tri-X and 
> all the discussions on this list about which was best and how to get the 
> optimum result.
>
> That's happening all over again but its even more complex now. But, I 
> think, it'll start to get simpler again. When my grandson (now 6 months 
> old) is our age....
>
> Happy snaps! As always I read all of your posts and am deeply grateful for 
> them, even when you're feeling cantankerous. <grin>
>
> Adam
>
> On 2014 Apr 7, at 6:56 PM, tedgrant at shaw.ca wrote:
>
>> I shoot with my M8 and whatever lens it maybe, my images look just super 
>> fine while printing 13X19 size prints. So is there some kind of 
>> situation? Lighting effect? Whatever? A situation where I can shoot a 
>> scene and see a diffeence. I'll rent a coded lens or maybe someone living 
>> near by has one I'll ask a loan for a few hours or so. And shoot with 
>> both non-coded and coded.
>>
>> Maybe that'll make me see the errors of my anti-coding rants!
>> thank you.
>> cheers,
>> ted
>
>
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