[LRflex] Re: Technical, Using Elpros + Cron 50 + Four thirds Camera
- From: "philippe.amard" <philippe.amard@xxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Sat, 21 Apr 2012 22:58:13 +0200
On the L1 you get the pix on 7.5 Mp - roughly the same as a 1/2 crop
from a D700 or M9 FF - the main difference being probably DoF, which
is deeper on the 4/3 - now you can get satisfactory medium sized
prints from either
But I may be wrong
Ph
Le 21 avr. 12 à 22:38, Richard Ward a écrit :
> 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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