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Thread: Need Grubb Lens Expertise

  1. #91

    Join Date
    Jan 2009
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    Denmark
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    Re: Need Grubb Lens Expertise

    2 more surfaced.

    770 and 2175 . Both aplanatics - can be found in Germany - enough said! Both a bit out of the ordinary.

  2. #92

    Join Date
    Oct 2017
    Location
    Dublin, Ireland
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    20

    Re: Need Grubb Lens Expertise

    A couple of unusual Grubb lenses at auction.

    770 looks like an Aplanatic, but is said to be achromatic portrait f5.5, obviously added much later as f stops, as we know them, did not exist in the 1850s/60s.

    2175 is said to be an Aplanatic, but has an unusual conical structure and comes with two washer stops. No obvious engraving.

    William
    Last edited by Willeica; 14-Mar-2020 at 05:03.

  3. #93

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    May 2018
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    A Scottish Island
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    178

    Re: Need Grubb Lens Expertise

    Both look modified to me. It would be essential to check that both have the serial number micro-engraved on the lens glass in order to determine just how unoriginal either actually is.

    Edit. Having looked carefully at the photos my guess is that 770 was modified well after it was manufactured because the roughly engraved 'Portrait f 5.5' suggests the engraver was used to f numbers which is suggests this engraving was made in 1870s or very probably later. The aperture stops appear to be large and fitted below the position of the original but I'm not sure of the effect of doing this - softening the image perhaps?. 2175 looks like an 'A' series stereo lens (and its physical size/focal length is close to those ascribed in adverts to the 'A' Stereo Grubb too) in an odd and decidedly unoriginal mount. I just wonder if at some point it was modified and repurposed with other old lens parts so that it could be used in an enlarger? If so its dark brown colour may be as a result of exposure to darkroom chemical fumes?
    Last edited by pgk; 14-Mar-2020 at 14:49.

  4. #94

    Join Date
    Oct 2017
    Location
    Dublin, Ireland
    Posts
    20

    Re: Need Grubb Lens Expertise

    I agree with Paul's (pgk) assessment of the 770 and 2175 lenses. Paul has better eyesight than I have and there is, indeed, some engraving on 770. It has a very dark colour like my 482, which I showed earlier and which might have been the result of having spent a lot of time in the workshop or lab. I suspect that 482 might have been used by the Grubbs in their workshop, hence the stamping rather than the engraving. There have been a few Grubb lenses appearing recently which have had mount or barrel alterations. As I know from my own experiments, the optical quality of the lenses is superb and, therefore, the existence of altered mounts and barrels and other features for different cameras and work types is hardly surprising.

    William

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