[LRflex] Re: Technical, Using Elpros + Cron 50 + Four thirds Camera
- From: Richard Ward <ilovaussiesheps@xxxxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Sat, 21 Apr 2012 16:38:53 -0400
Just had a quick thought on your question:
Assuming that the distance between lens flange and sensor on your digilux is
the same as lens flange to film distance on an R camera then why would their be
any difference in magnification ratios? The field of view would be cropped 50%
due to the 4/3 sensor, but the lens won't focus any closer than it would
before.
Now if you are attempting to recreate equivalent fields of view between what
the R camera produces and what the 4/3 sensored Digilux produces then life
might get interesting trying to riddle out magnification rations and such, but
when the query is 'what is maximum magnification ratio of X lens with Y Elpro
on it' but the lens to sensor plane is equivalent, then the maximum
magnification ratio ought to be a fixed value in my judgement.
The 4/3 sensor would just be cutting out 1/2 of what a full frame sensor would
see. It seems equivalent to putting a 'plate' over the full frame sensor which
has a hole the size of a 4/3 sensor cut out off it... the lens isn't altered
and the lens to sensor distance isn't different so why would the maximum
magnification ratio be different?
Sincerely
Richard Ward
_______________________________________________________
A business that makes nothing but money is a poor business.
Henry Ford
_______________________________________________________
On Apr 21, 2012, at 10:49 AM, Bille Xavier F. wrote:
> Thanks for the support Richard In fact, I don't have yet this Elpro. But I
> have the other hardware. I have read that the 14-50 Vario Elmarit of the
> Digilux can focus down to 29cmm (a little more than a feet) with a rate of
> reproduction of 1:3.2 I have read (thanks David Young for your article) that
> the 'Cron 50mm with Elpro VIb can give a reproduction rate of 1:2.6, er on a
> film camera, minimum distance is 14 cm (5 inches). Given the excellent
> resolution of the summicron 50 on a Digilux, it's quite tempting. But I have
> no idea of the final reproduction rate. And I have no idea on how to compute
> it. Experimentation, it gives someting to do on a bad day.
>
>
>
>
> <--->
> Xavier F. BILLE
> Maisons Alfort - France
>
>
>> Subject: [LRflex] Re: Technical, Using Elpros + Cron 50 + Four thirds Camera
>> From: ilovaussiesheps@xxxxxxxxxxx
>> Date: Fri, 20 Apr 2012 11:52:21 -0400
>> To: leicareflex@xxxxxxxxxxxxx
>>
>> Don't know the specific answers to your questions, but don't forget that
>> sensor size matters when it comes to depth of field comparisons.
>>
>> However!
>>
>> If you already own a 4/3 camera, a summicron fifty, and an elpro or two,
>> couldn't you simply slap a ruler on a table, the camera on a tripod, and
>> snapoff a series of comparison shots in short order?
>>
>> Richard
>> _____________________________________
>>
>> My Sarcasm Fu Is Strong,
>> Proceed With Caution. :-)
>> _____________________________________
>>
>> On Apr 20, 2012, at 6:04 AM, Bille Xavier F. <hot_billexf@xxxxxxxxxxx> wrote:
>>
>>> Good day to all
>>> The Elpro used on a Cron 50 will offer a magnifying view of say, X, on a
>>> film Leica R camera,
>>> Question: What happens to the value of X when the same lens is used on a
>>> Four Thirds, such as the Digilux 3.
>>> The 50mm has an angle of view equivalent to 100mm on the Digilux 3
>>> Would this X becomes X*2, twice magnifying ?
>>> Then the DOF at f2 must be equivalent to a "poil de cul" (Arse Hair,
>>> typical French to say a small or negligeible quantity).
>>> Then, which one, the ELPRO 1 or ELPRO 2 (equ. VIa and VIb) is better?
>>> Your widsom will certainly help me. Thanks!
>>>
>>>
>>>
>>>
>>> <--->
>>> Xavier F. BILLE
>>> Maisons Alfort - France
>>>
>>>
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