Lightsearcher wrote:
Thank you for the kind words, I travel now with three primes Voigtlander 21mm, 40mm and Nikon 105mm AIS but the 21mm is the most used specially for architecture shots.
Finally jumped onboard this Nokton train and got myself this gem that I have been dreaming about for couple years now. Found a pristine copy used. Pairs up great with my 40mm Nokton. Just got this 21mm and shot a few test shots around the house. I'm super happy how sharp this lens is even up close when wide open. Renders really lovely images. And with f/8 shooting outdoors it's pretty much overkill on my 24Mp body.
Ulysseita wrote:
Just got the Vm version for my M10r.
Perfect lens, with no tilting or other issues; perfect corners.
The only concern is under f2.8.
When I focus at middle distances over 2.8 I see a front focus on the rangefinder ONLY using this lens.
Below is a sample of the 100% at 1.4
on the left, the correct focus from the RF, and on the right a small correction after the RF going a bit backward (clockwise). https://i.imgur.com/KPgAIVP.jpg
Does someone have a suggestion?
My camera let me shooting the cv28 f2, 40 1.2, 50 APO and 90 Elmarit without any problem, so I suppose is the lens...
Hi Ulysseita,
If the lens front-focuses when using the rangefinder, you may adjust this by 'removing' a shim from the lens mount. Basically shortening the distance between lens and sensor. It's worth noting that the presence of adjustment shims can vary from lens to lens, so I'm not entirely sure if this particular lens has them.
It would be great if Voigtlander offered a simpler solution for correcting RF alignment.
Fred Miranda wrote:
Hi Ulysseita,
If the lens front-focuses when using the rangefinder, you may adjust this by 'removing' a shim from the lens mount. Basically shortening the distance between lens and sensor. It's worth noting that the presence of adjustment shims can vary from lens to lens, so I'm not entirely sure if this particular lens has them.
It would be great if Voigtlander offered a simpler solution for correcting RF alignment.
I was wrong, Back focus, so I have to correct to a closer distance to get the proper focus.
Ulysseita wrote:
I was wrong, Back focus, so I have to correct to a closer distance to get the proper focus.
To be sure, use a vertically placed ruler in front of the camera. Begin by focusing on a number with LV, then refocus using RF. If the focus shifts closer to the camera, it indicates front-focusing. Conversely, if the focus moves away from the original number, it suggests back-focusing. Correcting backfocus is simpler, as you only need to add a shim to the mount. Begin with a very thin shim and gradually increase its thickness until the RF focus is spot-on. It's worth noting that following the adjustment, the hard stop for the infinity distance may be slightly off. However, you will have the ability to accurately focus using the RF, which is your main goal.
Fred Miranda wrote:
To be sure, use a vertically placed ruler in front of the camera. Begin by focusing on a number with LV, then refocus using RF. If the focus shifts closer to the camera, it indicates front-focusing. Conversely, if the focus moves away from the original number, it suggests back-focusing. Correcting backfocus is simpler, as you only need to add a shim to the mount. Begin with a very thin shim and gradually increase its thickness until the RF focus is spot-on. It's worth noting that following the adjustment, the hard stop for the infinity distance may be slightly off. However, you will have the ability to accurately focus using the RF, which is your main goal....Show more →
That could be a solution, thanks Fred!
Do you have tips on where to find these shims?
other test at various distances, always 1.4, RF vs RF- a bit (so yes, backfocus)
The Voigtlander 21/1.4 lens is one of the best options out there. I have found that when shooting at smaller apertures, such as f/5.6 or smaller, the Voigtlander 21/1.4 Nokton produces better corner resolution than the Leica 21/3.4 SEM. I have tested this with two optimal copies of both lenses, and the Voigtlander 21/1.4 consistently outperformed the Leica 21/3.4 SEM in terms of corner resolution. The only downside is the size and weight when using it on a M body.
I just purchased a copy of the beautiful voigtländer. While sharpness is great in the center, the borders are lacking sharpness quite a bit on my RV. A bit of testing revealed that on the RV my copy shows some significant field curvature. To get sharp corners even at F8, I have to go quite a bit beyond the optimum in the center. Near infinity this is hardly possible. Has anyone also mounted his voigtländer by any chance on an RV? Could this be a "bad copy" issue or might this be camera / sensor related?
Thanks
Edith: I also just tested it on an A1. There the curvature is also obvious.
