Well it says in the PDF about the D 2x: It is asymmetric in construction with 6 elements in 4 groups and is designed for format sizes up to 6x7 cm and scales of 1.2x to 2.5x for projection purposes or 0.8x to 0.4x for taking purposes. The size data refer to the smaller side, i.e. for projection ont...

Seems weird but the Apo Rodagon D 2X is optimized for 2X when reversed (and for 1/2x when "normal" mounted), did you know? I haven't used it for some years now but I also remember preferring the 1X model for my 18Mpx APSC https://nielspn.dk/files/apo-rodagon-d.pdf From the MTF charts - which for th...

What is "MF" ?? I should have written "MFU" for "Modular Focus Unit", Rodenstock's helicoid similar to Schneider's Unifoc. https://www.closeuphotography.com/2x-lens-test I had similar results with pretty noticeable CAs that 'calmed down' at f8. I'm not at all saying it's a bad lens but if I had to ...

rdstk2x.jpg IF this is what u r talking about I was curious about the adapter, not so much about the lens and I got 1 of the 2 available. I thought if the adapter is something like the unifoc it will be usable for other lenses too... I got the 1x Rodenstock and it is great little lens... but this o...

Hi Ray I was curious about the reference you made about a modular focus unit with the lens so I ran a search. I think that I found an example but could not be sure what the mount actually was but then I noticed “out of stock” !! Best, John I just looked and can't find the auctions with the presumed...

I have an active search for these and was alerted today to a glut of them available on eBay. Anyone know what's going on? Seems maybe a manufacturing line shut down?

I see a couple auctions that even appear to have a modular focus unit with the lens, all for $199. IMO that is quite a bargain.

Thanks for all these suggestions. I am thinking that focusing the rear standard (which I also prefer to do with my 5x7 large format camera) should have the advantage of keeping the front of lens to subject constant and should be better for focus stacking. ... If you decide to focus with rear standa...

JKT wrote: ↑

Sat Mar 16, 2024 12:08 pm

About the corner softness: How are you ensuring that you film is flat?

I guess a seconday question is if all 4 corners have issues?

Another option (there are so many) is Rodico. I use it on my sensor to pick up dust particles without leaving residue. I've only recently started doing this so haven't incorporated it into my lens cleaning protocol, but I may give it a try as second cleaner (after a duster blow) to pick up dust and ...

I've been impressed by some of the wide angle enlarger lenses out there. They are far from perfect, but should immediately give you a better fit at lower magnifications on your big sensor. My favorite is the Schneider WA Componon 80/4 (80WAC), but I've had good results from the 60WAC as well. I've u...

The first Electronics Swap of 2024 happened yesterday. The time change made it a bit more interesting at the beginning, since it started at 6AM PDT. No one seemed to miss the change, as there were quite a few sellers already when I got there at 6:15, but it was dark until after 7, so lots of peeking...

... 6. Don‘t use any disposable cotton swabs (e.g., Q-Tip®) instead of the cotton or ITW Texwipe Clean Tips® swabs recommended herein, as the former are not free from contaminations. ... btw, I'm kinda surprised that ROR contains Ammonia and would be worried after the Zeiss warning. I use a lot of ...

Sounds like you guys are all chemists!

Edited to add: I stick with water (usually breath condensation) and pure Isopropyl alcohol.

I'm not sure if the Zeiss doc or others address this, but a really clean lens surface has the unusual quality that when rubbed with a swab or cloth or whatever, it has a feeling of friction. Someone may know the technical term or description of this, and please let me know if you do. This effect is ...

I know there are liquid lenses, but are there liquid filters? A filter that could continuously adjust across the visible range (and beyond) would allow a monochromatic sensor to be exposed at any wavelength. That would be cool.

Maybe piezoelectric?