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Thread: Anyone have a Bausch & Lomb Tessar IIb #11 for 16x20?

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    f311's Avatar
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    Question Anyone have a Bausch & Lomb Tessar IIb #11 for 16x20?

    I just picked up a clean set of front & rear cells for a Bausch & Lomb Tessar IIb #11 for my still in progress 16x20 build
    and I need to fabricate a barrel. Spacing by trial and error is probably my only option but I would sure prefer some measurements so I figured I would try throwing it out to the community first.
    Any B&L 16x20 IIb Tessars out there?

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    Re: Anyone have a Bausch & Lomb Tessar IIb #11 for 16x20?

    Focal length is 23.25" (cameraeccentric). You might extend your enquiry to other IIB tessars made in Europe with the (original) metric equivalent focal length.

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    f311's Avatar
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    Re: Anyone have a Bausch & Lomb Tessar IIb #11 for 16x20?

    Thanks. Camera eccentric has been my go to resource while collecting lenses for this camera.
    The 3 measurements I'm hoping to find are:

    1) overall length of a barrel mounted #11 Tessar (B&L or Zeiss)
    2) the total length of the barrel without the cells installed
    and
    3) the depth of the diaphragm measured from either the front or rear facing barrel edge.

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    Re: Anyone have a Bausch & Lomb Tessar IIb #11 for 16x20?

    I don't suppose there is a way of arriving at the measurements you are seeking by finding the measurement progression of B&L IIb Tessars, from say, 5X7, 8X10, 11X14, ...? I have an 11X14 and could supply measurements if needed. I would think there should be some members who have an 8X10 and 5X7. But this may not be a reasonable or accurate method of getting the measurements for the 16X20 IIb that you need.
    https://dl.dropboxusercontent.com/u/52893762/bigger4b.jpg

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    f311's Avatar
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    Re: Anyone have a Bausch & Lomb Tessar IIb #11 for 16x20?

    Quote Originally Posted by Randy View Post
    I don't suppose there is a way of arriving at the measurements you are seeking by finding the measurement progression of B&L IIb Tessars, from say, 5X7, 8X10, 11X14, ...? I have an 11X14 and could supply measurements if needed. I would think there should be some members who have an 8X10 and 5X7. But this may not be a reasonable or accurate method of getting the measurements for the 16X20 IIb that you need.
    Thanks Randy. That's a good idea that I suspect would get me quite close. With your measurements in hand and that of even just one other shorter IIb, I bet I would find a common ratio between focal length and key barrel measurements. When you have chance please do either post here or send me a message.

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