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    Re: Post Your Waterfalls

    It's dolerite, part of the Whin Sill. Molten rock was injected between layers of sandstone and limestone, and (being very hard and resistant to erosion) forms many prominent features in...
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    Re: Digital IR

    https://live.staticflickr.com/65535/52157645605_b6a5d46b64_o.jpg
    Clouds again by Peter Brooks

    Evening light yesterday. Spot the lead mining chimney way up on the horizon, more or less just a...
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    Re: Digital IR

    Geranium Renardii

    https://live.staticflickr.com/65535/52123943099_55f1e897a5_o.jpg
    Geranium Renardii by Peter Brooks
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    Re: Digital IR

    I've seen this as well in foliage, could it be areas of highly active photosynthesis? Rather than the older and somewhat jaded growth?

    Maybe someone with the appropriate biology / physics...
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    Re: Digital IR

    Great shots everybody! :)

    I love clouds in IR too... here's one from 2014:

    https://live.staticflickr.com/5585/14755926556_fa63e00c12_o.jpg
    Near perfect clouds by Peter Brooks

    The same...
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    Re: Digital IR

    A House Leek growing on our wall.

    https://live.staticflickr.com/65535/52097257575_a0502a99a8_o.jpg
    House Leek (Sempervivum tectorum) by Peter Brooks

    Self-converted D200 (750nm), 28mm f3.5 AI'd...
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    Re: Digital IR

    Thanks all. I really like the way that tree trunks and branches stay dark and provide great contrast with foliage and grass (like Peter's riverside shots).

    Another from yesterday. The sheep have...
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    Re: Digital IR

    Out with the dog on our regular route this morning. Overcast but still plenty of light, how different (and wonderful) the every-day looks in IR :)
    ...
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    Re: Digital IR

    Wow... looks like giant waves crashing over the trees.

    For once movement is advantageous :)
  10. Re: UK Lens repair and shutter installation for Cooke Aviar

    Sorry, I haven't tried it yet... but the Aviars / Aviaricas are highly regarded, a dialyte design I believe.

    Maybe balance the cost of the aperture repair against the value of the lens in a...
  11. Re: UK Lens repair and shutter installation for Cooke Aviar

    Snap! I have the identical lens, right down to the 'X5' and 'Copying'!

    227045

    Just to show you what can be done in the way of shutters Jose at Custom Photo Tools (in Portugal) made me this...
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    Re: Measuring old lens threads

    I'm doubtless stating the obvious here but if they are Whitworth threads do they comply with the RPS standards? For instance TTH standard lens ranges use flanges of 1, 1, 1, 2, 2, 2, 2,...
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    Re: Measuring old lens threads

    Randy are you thinking of Jose at Custom Photo Tools?

    Great work as you say, he made me a flange for an Ilex #5, and a 2" Whitworth to Ilex #5 adapter so I can use my TTH RVP (and other TTH barrel...
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    Re: Advice on lense (comparing 2 options)

    This doesn't answer your specific question but this page on large format portrait lenses is a good read:

    https://www.largeformatphotography.info/portrait-lenses/
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    Re: December 2020 Portraits

    I'd really like to know as well, I'm building a 5x7 enlarger - and I really like using paper negatives!

    It must be very different to enlarging from film? Any advice would be much appreciated.
  16. Thread: PPE lens

    by peter brooks
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    Re: PPE lens

    Mark, many thanks for all that info. It's great to have some history recorded here for others to find in the future - and good to know that the business is still going!

    As for the lens - I still...
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    Re: Compur shutter questions

    I can thoroughly recommend Jose at Custom Photo Tools. As well as the stock range of adapters he will manufacture custom items. I've had flanges and adapters in both metric and imperial threads, and...
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    Re: Enlarger sizing

    Thanks John. What a great setup! You have the luxury of space. I'll be constrained to running (and projecting) along a 2 ft deep piece of worktop (to a corner wall to the right) but should still be...
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    Re: Enlarger sizing

    Thanks Len, yes that calculation would be really useful - if possible, could you post it here?

    (I replied here rather than by PM because it may be useful to others in the future who find this...
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    Re: Enlarger sizing

    Thanks for the tip!
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    Re: Enlarger sizing

    That sounds interesting... How will the auto-focus work?

    (Realisation that I have no idea how auto-focus works - and I might be hijacking my own thread here :) )
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    Re: Actinic focus

    Thank you Doremus for that very comprehensive answer.

    I guess my interest here is in older lenses and trying to understand how better to use those that might be not be (intentionally or otherwise)...
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    Actinic focus

    Definition by Merriam-Webster -

    Actinic focus: the focus at which the chemically most effective rays as distinguished from the visually most effective are brought together (as by a lens).

    As I...
  24. Re: Question Regarding 35mm/MF lenses for Macro on 4x5

    There are lots of folks far more knowledgable than me on this forum but I would think that it is the angle of view of the lens that you should look at - think of it as a cone, as you focus closer to...
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    Re: Enlarger sizing

    Thanks Randy. The camera thing is just to get the relevant design parameters for the different formats.

    I've already got a 210mm enlarger lens (for 5x7), plus a 7.5" Ektanon and some very useful...
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    Enlarger sizing

    I'm going to build a 5x7 enlarger but I also want to print 5x4, 120, and possibly even 35mm.

    I have seen posts about using a LF camera in reverse as an enlarger (with a light source behind the...
  27. TTH Cooke IIIB Aviar(ica) 8" F6 'X5 Copying'

    I've just bought a lovely Taylor, Taylor and Hobson (Cooke) Series IIIB 8" F6 (barrel) lens. The beauty ring says Aviar (the TTH code for these F6 varieties is Aviarica) but also 'X 5' and...
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    Re: water filters

    Again possibly veering a bit off-topic but I work in a school and our science department constantly make their own distilled water - automatically, in a thing that looks a bit like one of those old...
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    Re: water filters

    (An answer not really addressing your original question, but...)

    For what it's worth I don't use filters, I use water from the tap (heated, of course) for all processing but always use distilled...
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    Re: Volume \ flow rate for RC print wash

    Thanks all for the suggestions and advice.

    At a previous house I used to use a spare tray and a shower head in the bath - that was certainly vigorous agitation (effervescing even) and after three...
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    Volume \ flow rate for RC print wash

    Hopefully someone has addressed this same issue.

    My darkroom (in a converted garage) has cold water only from a mixer tap. (One day...) So I process film using multiple thermos flasks of pre-mixed...
  32. Thread: Thin negs

    by peter brooks
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    Re: Thin negs

    That's good to know, luckily all the shots were not far away, so I can easily take them again. A pain, but not a disaster.



    They did scan - kind of - lots more garbage visible, and even the...
  33. Thread: Thin negs

    by peter brooks
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    Re: Thin negs

    Thanks both. I think the Rodinal was to blame, I've ordered a fresh bottle.

    I like Fomapan for its cost-effectiveness (a marketing man once told me never to use the word 'cheap') but not at all...
  34. Thread: Thin negs

    by peter brooks
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    Thin negs

    Just wondering what went wrong here... Last batch of negs came out very thin.

    Fomapan 100 - film holders left loaded for quite a while (but not kept in excessively hot conditions).

    Rodinal -...
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    Re: Cooke Portrait Lens Serial Numbers

    It's buried on page 4 of this thread but here is the link to Karl's spreadsheet:

    https://docs.google.com/spreadsheets/d/1Zan_PR-3rcPkejlblOhAjLPdZQ_saO3HLEG2a-dmsKc/edit?usp=sharing

    I doubt if...
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    Re: Cooke Portrait Lens Serial Numbers

    I would expect to see at least the model designation (Series IIA), the focal length, max aperture and serial number engraved somewhere.

    I believe TTH also devised and marketed engraving machines,...
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    Re: Cooke Portrait Lens Serial Numbers

    Seems very odd to be lacking an engraved serial number... even later TTH lenses like the IIIb and war time Aviars have them...

    I wonder, is there any engraving on the 'beauty ring' (does the hood...
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    Re: Facebook Group on 19th Century Lenses

    This site and forum is such a great repository and resource - please don't take potential content away from it! It is accessible to all, logged in or not, and searchable.

    Like many others I don't...
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    Re: Portraits from 2021

    Looks like the not-so-grim Reaper :)
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    Re: press-on lens shade for 203mm Ektar?

    Just a note for anyone finding this thread in the future - in the UK (and presumably the EU also) a version of the 203mm marked 'Mount 370' is common (I think this was made in the UK). It takes a...
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