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There's a 150mm G-Claron, it's slow, but should be good for 1:1 and almost up to 2x with your bellows.... not expensive.

Some good comment above, but can you just remind me of your format, and an estimate of the mag you're getting - sounds like around 1:1 or is it bigger ( more mag ? )
Maybe I can think of something...

These are a bit longer in optical construction than eg. a G-Claron,so I'd suggest 3:1 to 1:3 for critical use, this would be more at wider apertures, and when stopped down probably more, 1:5 to 5:1...

There is a set of three trays, one on the worktop and the stop and fix on the shelves underneath. Then in the main kitchen I have a holding tray if I'm doing a mix of stuff, some which needs washing...

Smaller Symmar-S/Apo-S/etc are already pretty sharp at f/8 and super-good from f/11 down. The bigger ones from 210 up need a bit more stopping down to be sharp over a decent area.
I agree with Oren...

The tonality of 40's/50's films, especially, is wonderful.

Here's a 5' x 7' darkroom with a 5"x7" enlarger that can do 20x16" prints. There should be a Nova 6-slot washer in the corner on the wooden table - I had just commissioned the enlarger here and was...

https://www.largeformatphotography.info/forum/showthread.php?59085-Wimberly-WD2D-and-Jobo-Rotary-Processing-Heaven!

Very interesting, thanks. I had picked up a couple of old postings about WD2D/+ being 'thin' .

John said that the 'cookbook' missed out the sodium bisufite, 20g . Not the pyrogallol.
When I get time I'll dig out the link to his posting.

Seemingly, but however John gave all of the info at the time it was posted here ( 2011 ) , I just checked my copy and it was 9.5 mins for FP4+ for an N development at 70°C.

I did Alan, I mixed some up early this year and tried using it. I agree that the dilution seems to be 1+1+64.
( ps. i still don't believe there is such a thing as WD2H+ , I think it's WD2H. It's...

A standard lens might be fine on this subject, but the image errors at a non-designed mag are not just field curvature - you also get coma and astigmatism in the field. This will alter the sharpness...

Norland cements like 60 ( and 61 ) are widely used in industry, but maybe aren't the best choice for home use. Their expiry date is usually short and you need UV lamps.

The Apo Ronar ( and Apo Artar ) fares better across Infinity to 1:1 because its field angle is lower. The trade-offs aren't as harsh in this case, as with 70 - 72° lenses.

I have looked at the...

I'm not trying to get at you, Kevin. I'm just coming at this from a different angle, being a designer.
Re. separation, I was thinking in the context of the OP's 300mm Symmar picture.

As it is, i...

Well, not necessarily, it depends on the lens design. The failure mode would be that for high field angles, the light doesn't get out of Lens 1 into lens 2 , it just TIR's ( Total Internal reflect )...

Yes, great info from Kevin.
However, here's a question, going back many steps, has anyone just tried oil ( preferably microscope immersion oil ) applied to the gap where the cement has separated, to...

Fully understood, William !

That's a stupidly-doctored version of Washburn's Doldenhorn shot. I just checked around the corner in the living room - for starters it's a landscape format ! ( & no piranha present )
The print...

I think you have a few more sources of error than you think, but I wish you good luck.
One point is that the cap ( flat ) around the cave side of the symmar doublet is not used for mounting in the...

Thanks for the link.
I would love to see some of Sella's real prints.
Was there enough sensitivity outside of the blue in the plates by 1900 that you could employ a yellow filter ? I see some tone...

Helps if you can iterate the dimensions yes.
I would take off the tops of the surface texture with fine emery cloth too.

How are you going to hold the lenses perpendicular to the jig ?
I can...

That's an interesting method Bob, thanks for that. I must look more closely at some of my negs in reflection as well. I do a lot of work shooting into the light on seashore scenes and backlit trees &...

Well, OK, but typical 3D-printed plastic will not be accurate to 0.001" . Our expensive new machine at work for product mock-ups, might be approaching that level.

I thought you were hoping to re-cement the 300 Symmar-S above, where the lenses are not the same diameter , or easy shapes ?
What kind of jig did you mean, maybe I need to re-read.

For same-size...

Interneg, thank you for your detailed comments, and I can't match your understanding of the chemistry - but you have not mentioned one key feature of staining developers which is the reduction of the...

Yes, however the telescope making books won't deal with the kit required to cement two dissimilar-diameter lenses.
I think we still have a copy of 'Optical production technology' by Horne , at...

I'm with Drew on this.
I don't think you've done the baseline work on what HP5+ is capable of in staining developers.

I'm racking my brains trying to think how this sort of thing was done in the days before air-bearings and optical alignment telescopes. Have you got access to any of the old textbooks on optical...

Sadly, I was able to watch the demolition of their final incarnation, the Chance Pilkington site in North Wales, in 2008, from my desk across the road.

Yes, the sentence about "...which was superior in many respects to the over-praised products of the German factories." betrays some bias !

Chance were certainly significant though - I believe they...

This is quite possible. I believe that the Schott filter materials were/are only produced in a limited width, which would require fitting two filters side by side to cover the area.
I have a piece...

Well, the polishing tool has a former made out of metal, but the polishing surface was a layer of pitch that conforms to the lenses and holds the rouge or cerium. Polishing with pitch was...

The surface accuracy on photo lenses is typically less stringent than on telescope optics - eg. 1 to 3 fringes, rather than less than 0.5 fringes on a telescope.

I work in an optical company....

This is all good and makes sense. I am familiar with the process, I got into optics by grinding and polishing telescope mirrors. the pitch needs to be optical quality.
Yes, modern AR coatings are...

Normally I would expect Schott KG1 as a filter in these locations. I think that was what was used on the 138S . That is relatively colourless

My solution to the bulb problem is in this thread -

http://www.film-and-darkroom-user.org.uk/forum/showthread.php?t=14606&page=5

It's fine enlarger, you were lucky to get one free !
The...

Excellent - so glad it worked out for you !

Are the Eclipse team all stunned into silence ?