[rollei_list] Re: Rolleiflex 3001 vs CZ Planar 1.4/50 HFT 4948XXX
- From: John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 19 Aug 2010 11:52:23 +0100
Thanks Carlos.
I will check my lens configuration and results when I get home tonight and
report back.
John
On 19/08/2010 11:47, "CarlosMFreaza" <cmfreaza@xxxxxxxxx> wrote:
> 2010/8/19 John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>:
>> My Prochnow book is at home and I will check tonight but I expect Carlos
>> will have his to hand and can check the photographs of the rear of the
>> respective lenses before I get home. ;-)
>
> Hi John:
> As I wrote in an earlier post, lenses with PR (Prochnow
> Register) QBM I and PR QBM II have aluminium focusing and aperture
> rings painted black with channels grips pattern; lenses with PR QBM
> III and QBM IV have the square/diamond rubber grips pattern for the
> focusing ring and aperture ring.
>
> QBM I lenses are easy to recognize because they have a slider to
> change from automatic to manual and one pin.
> QBM II lenses don't have the slider and have a second pin to simulate f stops.
> QBM III lenses are identical regarding QBM II lenses about the mount
> features, the difference is the focusing and aperture rings material
> and patterns as described above.
> QBM IV has an additional "step" or ring to give electrical info to the
> camera about the lens widest aperture, this "step" is very difficult
> to distinguish in bi-dimmensional photographs, however if you consider
> the number of circles in the lens mount, you'll see five circles for
> QBM III and six circles for QBM IV or at least QBM IV will have one
> additional circle using identical criteria to consider what is a
> circle in the mount. My Rolleinar Tokina zoom and Rolleinar Mamiya
> tele 200mm have the QBM IV "step" according you can expect from these
> lenses description, anyway I don't have older QBM mount lenses to
> compare.
>
> It is expected that if you use a QBM III lens on a 2000 camera the
> LEDs in the VF will show all the apertures together "on" and not "off"
> .
>
> Carlos
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