Yes, my good friend Marco Cavina has researched and written about them, those older ones look like that (left/rightmost normal lenses for comparison), both S-Planar 436nm resp. 405nm: http://www.photomacrography.net/forum/userpix/648_Cavina_Zeiss_Stepper_lenses_2_1.jpg and inside like that: http://w...

Lou Jost wrote:I don't have a 365nm lens, but will keep an eye out for a cheap one.

Quite a few high resolution lenses are able to be used at this wavelength, or at least at 370-380nm as optical glass often transmits down to about 350nm. More at my site...

Until reading your post, I had no idea these lenses were meant to be used as pairs. Paired, reversed orientation makes a very different ballgame. This information was a game-changer for me too. I am a big fan of coupled lenses for use at m around 1 to 4, because of their significantly lower EA than...

I have some collection of older RODENSTOCK XRAY Lens datasheets (Heligon, Rotelar etc. about 40MB) which I would be willing to share. I would upload them, if there is an interest....

Note that the image circle of the 150PN is only 30mm at 1:1. There is a noticeable degradation in the corners at 1:1 on APS-C (30% at f2.8, 20% at f3.3 according to MarkG's tests). End result is that at 1:1 the 150PN is a bit sharper in the center, but not as sharp in the corners as the 105PN. For ...

Lou Jost wrote:My collection looks similar....but I really can use them for what they were intended. Even the fact that they are made to shoot through thick glass (4+mm) works to my advantage, since I need to shoot specimens through a few mm of liquid.

Great if that works for you!!

I had read your posts about these. Sure, they are garbage if used far from their design point. But they are superb lenses when used properly. Granted, not everyone has an application where they will be useful. I think they get a bad rap. Agreed, most people are just getting nuts about their speed a...

The thing about this version of the PN150 is that it goes up to 5x with floating elements, like the SK Makro-Varon but a whole stop faster. This is the only macro lens you would ever need (for studio work) and it would it beat nearly anything else on the market at each of those magnifications. 5X w...

Hi Klaus, I remember seeing your blog, as well as your frequent posts on UV forums. I was thinking that with a cooled monochrome astrophotography sensor, with no filter stack, it might be possible to see something of that UV-C light using very long exposures and no filters, since the transmission c...

Andy Davies wrote:Whilst researching flocking materials I came across this paint

http://stuartsemple.com/projects/black- ... -material/

Yeah, thanks to JMC who originally found and posted this on UVP Andrian ;-)

I'm not surprised to see these rather sad results, have done similar many years ago also with disappointing results. Sold my S-Planars and Ultra Micro Nikkors later, luckily with quite a profit due to their rarity... :-)

In a way funny to see how history repeats itself ever so often...

Lou Jost wrote:Hope it works out for him. That was an extremely rare lens at a very good price.

I bought mine for much less, but this was a while ago ;-)

I'm excited to hear that someone with a big sensor is experimenting with these! That's what these lenses really deserve. They are basically 10x or 5x microscope objectives with high NA (up to 0.30) and perfect sharp image circles 125mm + in diameter! That's exciting. I think since this is macro wor...

I have many of these lenses Xray and micro-litho, most of them unfortunately just great as paperweight or better, door stops. Soem are useful and I use(d) them. Some may be seen in my online collection, along with some data I could find (select "Special Lenses"): http://www.macrolenses.de/

I've seen a Rayfact graph that rates the OEM 95mm f4 lens for around 9-10micron sensors. Also confirmed by an email from Rayfact. Of course it can be used for smaller pixel pitches but this is where the issues kick in. Quote from the US distributor for the Rayfact MJ90 is $1475. Some of the auction...