Brian Sweeney is back at RFF.

Very excited to see you back here Brian!!!

My favorite lens inspired by your hacks, 5cm Sonnar in J8 mount. You mentioned in the past that my lens was in the first T marked batch.

 
Thankyou- and that Sonnar is a Beauty, and the photograph proves it.

And it is an early "T" coated lens. That batch was completed in early 1938, a batch of 5000 ending at sn 2,232,200, ordered in 1933.
 
Welcome back, Brian...we missed your lens hacking expertise and your excellent advice on old lenses.
 
Hey, Brian! Great to have you back and looking forward to you sharing your knowledge of lenses, including Sonnars and Sonnar variants. I am curious about one lens that I picked up about three years ago: a 1943 Jena Sonnar 50/1.5, serial no. 2724622. It has the red T indicating coating. I purchased the lens from another member here, who told me it had been in the collection of LeicaTom. The seller also reported that, after he acquired it, he had sent the lens to DAG for an overhaul. The lens is in great shape now, but I wonder this: did you ever work on this lens?

Here’s a sample photo from this 1943 Sonnar:


Listening by bingley0522, on Flickr
 
It's always great having technical expertise on RFF from a proven "Expert".
Looking forward to your comparison of the four Voigtlander 50/1.5 Noktons, from the Prominent lens through the two ashericals and now the latest.
Always have considered the first Nokton to be one of the very best lenses ever created, especially in comparison to the competition being offered at the time from Zeiss, Leica, Nikon, and Canon.
Welcome back! 🙂
 
Brian does not need an introduction. Take a brilliant scientist and add to it a deep love for optics and tradition, and you get closer to introducing Brian.

Brian was always there for me when I was exploring some old lenses, such as the Luxon 50/2 for the Paxette. It looks like a ltm mount lens, but it is different. Brian found a lens barrel from some FSU ltm lens, and he transferred the optics to this ltm barrel. The Luxon is now a ltm lens. That was fun.

Another lens adventure was a 50mm lens for a Retina camera that someone adapted to ltm via an adapter. Brian inspected it, and he told me that a lens element needed to be replaced due to damage. I bought a second Schneider lens from some Retina camera and I sent it to Brian. He replaced the damaged element with a good looking element. Turns out that one element was not coated while the other element was coated!

I have several other lenses that Brian put together.
 
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