Contax N 50mm
/forum/topic/762543/0

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CVickery
Registered: May 14, 2004
Total Posts: 2623
Country: Canada

It's been a couple of months now since conurus announced the availability of the 50mm conversion. Has anyone any information about the converted lens and how it performs?



Lotusm50
Registered: Sep 26, 2005
Total Posts: 6228
Country: United States

They are revising their firmware and the conversions are waiting for it to be completed. My understanding is that he is adding functionality to the firmware that Canon hasn't yet implemented.

My N 50mm is sitting there waiting, so I won't know until sometime in May, and I don't think that there are any converted N 50mm's in circulation yet (except for maybe a demo unit or 2).

Patience, my friend. All good things come to those who wait. ;-)



cyberstudio
Registered: Nov 08, 2005
Total Posts: 592
Country: Canada

There are a total of 4 of these in the world with the existing firmware version. I am currently working on a new firmware which permits direct aperture control in movie mode on a 5D mark II and will start shipping the 50's in volume in May.

I really want to find time to post some images to help with your decision but I really don't have time. It is more important for me to fulfil my commitments to existing orders in the shortest possible time before attracting new orders.

Bo-Ming
conurus



Paul Yi
Registered: Dec 10, 2004
Total Posts: 5298
Country: United States

Is it true that Contax N 50/1.4 is basically same optical design as C/Y 50/1.4?



cyberstudio
Registered: Nov 08, 2005
Total Posts: 592
Country: Canada

I don't know. They are similar but one of my customers who has both reported improved bokeh. Anyhow here is a sample shot at f/1.4.











Lotusm50
Registered: Sep 26, 2005
Total Posts: 6228
Country: United States

Paul Yi wrote:
Is it true that Contax N 50/1.4 is basically same optical design as C/Y 50/1.4?



I think, "basically" is correct. Consensus is that little was done to the optical design, but don't really know if there was some small or subtle tweaks done or not (glass formulations, etc.). There are, however, significant improvements in barrel design and coatings that will improve overall performance (flare, internal reflections, ghosting, etc.) compared to the c/y (or RTS) version of the lens. The aperture mechanism and shape is also a little different and that may contribute to the perception of improved bokeh that cyberstudio mentions.




Andrew Gough
Registered: Jun 10, 2005
Total Posts: 2080
Country: Canada

The design is very close and the mtf's are virtually identical. According to the Zeiss literature the N mount version used " high refractive glass types". The minimum focussing distance was also reduced slightly with the N version by 5cm so there must have been some change.



Andrew Gough
Registered: Jun 10, 2005
Total Posts: 2080
Country: Canada

This lens is fantastic, almost no CA wide open, beautiful Bokeh, and Zeiss 3D

Here are a couple of samples 1DS3 wide open:













CVickery
Registered: May 14, 2004
Total Posts: 2623
Country: Canada

Thanks Andrew. I'm glad now I wasn't patient as Lotus recommended. The 50/1.4N that I've bought from pascal just arrived at conurus for conversion



pascal03
Registered: Jan 21, 2005
Total Posts: 4148
Country: United States

Pondering the true meaning of "sellers remorse" as more and more pictures are begining to show up



Dergiman
Registered: Mar 12, 2005
Total Posts: 815
Country: Austria

andrew, the bokeh in the 2nd shot looks promising, canīt wati to get my 50 back from bo ming!!!!



wayne seltzer
Registered: Dec 22, 2007
Total Posts: 4160
Country: United States

Simple question:

I just received a Contax N 50 1.4 lens and would like to check out the aperture blades are working properly. When I change the aperture ring setting nothing is happening with aperture blades as I assume the aperture is stopped down automatically electornically with the camera. Is that right? Any simple way to check the aperture blades before converting the lens?



mawz
Registered: Sep 11, 2005
Total Posts: 8157
Country: Canada

wayne seltzer wrote:
Simple question:

I just received a Contax N 50 1.4 lens and would like to check out the aperture blades are working properly. When I change the aperture ring setting nothing is happening with aperture blades as I assume the aperture is stopped down automatically electornically with the camera. Is that right? Any simple way to check the aperture blades before converting the lens?


That is correct. The aperture is electronically-controlled and the aperture ring is in fact an encoder. You'd need a N body to check a non-converted N lens for aperture function.



wayne seltzer
Registered: Dec 22, 2007
Total Posts: 4160
Country: United States

Thanks Mawz.
Why even have an aperture ring, couldn't they control that through the camera just like camera's today work?



mawz
Registered: Sep 11, 2005
Total Posts: 8157
Country: Canada

wayne seltzer wrote:
Thanks Mawz.
Why even have an aperture ring, couldn't they control that through the camera just like camera's today work?


A lot of people like the aperture ring, the ergonomics are arguably better than the dual-wheel setups. The PanaLeica 4/3rds lenses have the same setup and it works very well.



cyberstudio
Registered: Nov 08, 2005
Total Posts: 592
Country: Canada

The design philosophy of the Contax N system is to make a fully automated camera system which operates with manual-focus-era ergnonomics. Given that backdrop, fly-by-wire is the natural outcome. In aperture-priority and manual exposure modes, the aperture ring of the lens controls the aperture on a Contax N body. In shutter-priority and program modes, the aperture ring is ignored.

If you remember the older Nikon camera bodies, you have to set the lens to the orange aperture, or to 'A' for the older Pentax camera bodies, in order to use shutter-priority and programmed exposures. It is because their aperture is mechanically linked to the aperture ring, but not fly-by-wire. Both of them has since then ditched the aperture ring altogether for the newest lenses and require older lenses to be permanently set to the 'A' or orange position to operate on the latest digital camera bodies. (Not counting the special support for K lenses without any 'A' positions.)



Andrew Gough
Registered: Jun 10, 2005
Total Posts: 2080
Country: Canada

wayne seltzer wrote:
Simple question:

I just received a Contax N 50 1.4 lens and would like to check out the aperture blades are working properly. When I change the aperture ring setting nothing is happening with aperture blades as I assume the aperture is stopped down automatically electornically with the camera. Is that right? Any simple way to check the aperture blades before converting the lens?


Wayne,

Its like a Canon lens, - fully electronic. To see the blades you will have to mount it on a Contax body and do a depth of field preview, or wait until the conversion is done.



wayne seltzer
Registered: Dec 22, 2007
Total Posts: 4160
Country: United States

Just mailed my N 50 1.4 to Conurus this morning!
Cosmetically the lens is in almost mint shape, just hope the mechanical is good too.

Andrew,

How about posting a few more amazing N 50 1.4 shots while I wait for conversion?



CharChar
Registered: Mar 19, 2009
Total Posts: 563
Country: United States

I am using my Contax N 50mm more than another lens these days. In fact, I am selling my other lens.



wayne seltzer
Registered: Dec 22, 2007
Total Posts: 4160
Country: United States

CharChar wrote:
I am using my Contax N 50mm more than another lens these days. In fact, I am selling my other lens.


Can you post some more pictures with this lens wide-open?
How's it compare to your C/Y 50 1.4?



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