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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...

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...

Geranium Renardii

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

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...

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...

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...

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...

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 :)
...

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

For once movement is advantageous :)

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...

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...

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 1¼”, 1½”, 1¾”, 2”, 2¼”, 2½”, 2¾”,...

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...

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/

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.

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...

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...

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...

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...

Thanks for the tip!

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 :) )

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)...

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...

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...

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...

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...

I've just bought a lovely Taylor, Taylor and Hobson (Cooke) Series IIIB 8½" F6 (barrel) lens. The beauty ring says Aviar (the TTH code for these F6 varieties is Aviarica) but also 'X 5' and...

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...

(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...

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...

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...

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...

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...

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 -...

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...

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,...

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...

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...

Looks like the not-so-grim Reaper :)

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...