[rollei_list] Re: Rolleiflex 35 SL lenses QBM IV (3-Pin)
- From: John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 10 Aug 2010 12:33:25 +0100
James,
Belatedly responding to your query; from memory (I do not have any of my
3000 lenses in front of me), the QBM IV lenses have a groove around the
circumference of the mount. The groove depth gives the maximum lens aperture
information to the camera metering system. You can experiment by pressing
the camera pin in gently and the aperture displayed in the viewfinder will
change. Some lenses do not have an actual groove, because the depth of the
groove is in effect zero. However, the early lenses did not have the groove
either but the protrusion of this ring on the lens mount is such that the
meter knows that the lens is not fully compatible with the camera and so you
have to revert to open aperture metering. Hence if the camera pin is not
depressed at all or it is depressed too far, the meter aperture display does
not show. The first pin is the stop down pin, the second is the 'set
aperture' information.
The difficulty checking a lens from a photograph can arise when an older
lens has been converted to the later mount.
The German Rolleinar at:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280540109557&ssPageName=A
DME:B:SS:US:1123#ht_4262wt_1139
Shows the slight groove and the two pins in the shot of the rear of the
lens. Also in the photograph of the 'Made in Germany' inscription.
John
On 03/08/2010 03:34, "James Richard Tyrer" <tyrerj@xxxxxxx> wrote:
> I have searched the web and have been unable to find a source of
> information like this one for Nikon:
>
> http://www.photosynthesis.co.nz/nikon/serialno.html
>
> based on the lens serial number.
>
> Does anyone have suggestion on how to tell a QBM IV lens without
> actually having it in hand? I can sometimes tell by looking at
> photographs of smaller aperture lenses but it doesn't seem to work with
> f/1.8 lenses. Do I understand correctly that any f/1.4 lens with the #2
> pin will work?
>
> I would presume that serial number data exists. Is there somewhere that
> we could obtain it?
>
> Alternatively, we might be able to start a data base using the serial
> numbers of lenses that list members have. That is if you have a lens
> and know for certain if it is QBM III or QBM IV and could provide the
> lens info and serial number, it might be some help.
>
> In this case, if someone that has a 2000 or 3000 series Rolleiflex and a
> Rollei Planar 1,8/50 that you know to be QBM III or QBM IV and could
> post the serial number, it would be a help with trying to purchase one
> on eBay.
>
> Thanks in advance.
>
> --
> James Tyrer
>
>
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