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 veryhotthread  Author  Topic: CS Lens to DSLR  (Read 7003 times)
AC3THX
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xx CS Lens to DSLR
« Thread started on: Feb 4th, 2011, 11:35pm »

HI,

I'm a Mamiya NC1000 user and fans from Hong Kong.
I really want to use my CS lens on morden DSLR, is it any adaptor for this? rolleyes

Thanks,
Sam
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xx Re: CS Lens to DSLR
« Reply #1 on: Feb 5th, 2011, 04:10am »

Not as far I know. The CS mount is unique for for The NC1000s. The 35mmslr's produced after the NC1000s do have the same mount, but it is rotated 90 degrees. The mount is to rare, I think, for commercial adapters.

The CS lenses do not have an Manual function for aperture, which means you loose the possibility use smaller aperture but the maximum. T's easier to find old M42 Mamiya lenses with a auto/manual switch.

I've been doing measurements for mounting a CS to a DSLR. Three problems, (1) the mount it self (could be salvaged from an SLR defect beyond repair, which you combine with a m42 adapter for the DLSR, together with some major surgery on both, to make them fit), (2) adding a spring to adjust aperture in the mount, for i don't want to modify my lenses, (3) infinity focus.

Problem: the mirror. With a Canon 40D it should be possible, but it is a technical challenge (strong and small) and risky for the lens and mounting construction will get very close to the mirror.

I lack the equipment and i consider it to risky. Just buy yourself some 35mm film and enjoy.

Jasper

« Last Edit: Feb 5th, 2011, 04:11am by jcdebock » User IP Logged

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xx Re: CS Lens to DSLR
« Reply #2 on: Feb 5th, 2011, 06:48am »

HI, Jasper

Many thanks for your detail information!!

Sam
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xx Re: CS Lens to DSLR
« Reply #3 on: Oct 18th, 2011, 8:57pm »

On the 8th day the lord said let there be a CS to EOS adapter, and there was, and it allowed infinity focus, and it was good.

It doesnt allow for stopped down exposures, you must shoot wide open. But nonetheless you can now fix your CS lenses to a Canon EOS DSLR camera.

See the CS to EOS adapter here:
www.shapeways.com/shops/polymetric

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xx Re: CS Lens to DSLR
« Reply #4 on: Oct 19th, 2011, 10:55am »

Did you consider adding construction similar to either the p-mount adapter or the autoextension tube? combining that with a manual lever or a spring, it would result in pressing the aperture pin either by hand or just simply always. By setting the aperture ring to the desired value, you create a proper combination with an Canon EOS, for it is rather good at stop-down metering. And otherwise you can easily fall back t manual labour (at least with a 40D.

I did some measurements, i considered it rather risky. But my measurements were crude, and you seem to be close to a pro (or a real pro maybe?)

Jasper
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xx Re: CS Lens to DSLR
« Reply #5 on: Oct 20th, 2011, 9:09pm »

I thought about how to work the aperture but there are a few roadblocks.

First issue is clearance. There is about a 1mm gap between CS flange outer diameter and the EOS inner diameter, and that gap is filled by the adapter itself. Having some kind of mechanical linkage that passes through the adapter to the interior would be difficult to execute, and you'd have sub-millimeter moving parts* with gaps between that light would permeate.

2nd issue is that the aperture pin on CS lenses, unlike the M42 lenses I've seen, is not spring loaded.. For example, most EOS to M42 adapters have a flange that depresses the aperture pin when the lens is screwed in, allowing you to stop down to any setting. I wanted to do this in the beginning, but unlike my m42 lenses the aperture pin on most** of the cs lenses can not be depressed fully unless the aperture ring is set to f/16 or automatic. Also the CS pin can only be depressed a percentage of the total throw based on the aperture ring setting. At f/3.5 or larger, the pin hardly moves at all. Mamiya/Sekor's design choice here makes mechanical actuation of the aperture pin a requirement, no faking it with a static flange.

So, actuating a p-mount style aperture depressor is nearly impossible because there isn't enough room for the required moving parts. And the M42 style flange for permanently depressing the aperture pin isn't possible and could cause damage to the lens.

I considered adding some kind of leaf spring, or some other something i haven't thought of yet, to allow stopped down exposure, but right now the adapter I've designed is wide open only.

I should be receiving the prototype this week, so I'll know if the initial design needs work or if its ready to use as is. down the road i may yet consider trying to get and aperture function built in.. will have to wait and see what is possible in the space allowed. The great thing about 3d printing is I can change the design and print another one easy as pie.

Side note about myself.. I'm no "pro," as I am currently employed as an IT monkey for a major conglom-o-corp.. In my previous life though I've worked for an architect doing 3d visualization for marketing materials and bids. Later I was a 3d designer and animator for a big house style marketing firm.. I've done a lot working with clients' arch/eng/cad files, prepping for visualization or animation, and have plenty of experience with the major CAD and 3d animation packages... Truth be told though, my IT job requires much less talent and is far more lucrative than any of the creative work I've done.. go figure!

*Current 3d printing process does not permit sub-milimeter the detail required, but the technology is progressing rapidly.
**The 200mm, 80-200mm (and possibly the 300mm & 45-90mm) lenses have a spring loaded aperture pin, but not all CS lenses do and thus the EOStoM42 style aperture flange was omitted.
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xx Re: CS Lens to DSLR
« Reply #6 on: Oct 21st, 2011, 2:25pm »

The aperture pin is the one i'm concerned about. First, if you are stupid enough to mount a cs lens set at automatic to an adapter, that the counter-aperture pin comes out and me stuck at some other part of the adapter.

Second the lack of spring in it. The counter aperture pin has a spring pulling it in while the lens is not set at automatic. I figured that there would not be enough room for a lever, but that would not be ideal, you would need an extra finger to manually close the diaphragm.

What i tried to say in my previous entry: the option of a leaf spring. It would probably be a construction that can not be easily printed, bet must be added later. It must be of rather specific material. Maybe there is something commercially available (ordered separately) that can be attached (screwed in) later, attached to the holes left after 3d printing.

I'll do some serious googling

Jasper
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xx Re: CS Lens to DSLR
« Reply #7 on: Oct 21st, 2011, 3:00pm »

We could try and make it out of something like phosphor bronze plate, is used for making springs models (models which actually work). Comes rather cheap (less then 10euro's 15x20cm's). Does not need to thicker than .4mm and is available 0,1mm. Jasper
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xx Re: CS Lens to DSLR
« Reply #8 on: Oct 21st, 2011, 4:25pm »

A leaf style spring is the best thing I could come up with as well, and the 3d printing process could possibly produce the spring since the plastics they use are strong and flexible and could work very well if executed the right way. Right now though they have a minimum wall thickness of 1mm, and a 1mm leaf spring could be too rigid for this purpose. Anything less and they would reject the design citing "insufficient wall thickness"

Another part of the reason I omitted aperture function for now was that I wanted to test fit the actual bayonet flanges first. After i know the bayonet fits, i can nail down the location of the aperture pin and required spring. Otherwise I'd be taking a guess in CAD and finding out later its in the wrong place... You can measure all day long, but until you have the parts in hand, you cant be sure.

I can see a metal spring working, I'm just not sure how i'd fix the metal spring to the 1mm thick walls of the adapter.. i dont have screws that small, and its not likely they would hold permanently..

There are definite limitations to what we are trying to accomplish here sad

According to UPS tracking the 3d prints of the EOS to CS adapter, and the replica P-Mount are at home waiting for me now.. 2 more hours of this so-called "work," and I'll be heading home to play with the new toys.---Stay tuned for impressions and photos
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xx Re: CS Lens to DSLR
« Reply #9 on: Oct 21st, 2011, 6:33pm »

An exception in the sorting process has occurred. UPS has taken corrective action.

Scheduled Delivery Updated To:
Tuesday, 10/25/2011, by 3:00 P.M.(by end of day for residential deliveries)

MOTHERBITCHASS!Q@
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3D Printed Mamiya CS to EOS adapter ( http://shpws.me/llIh )
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xx Re: CS Lens to DSLR
« Reply #10 on: Oct 24th, 2011, 3:27pm »

Behold!

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The CS to EOS adapter is a reality. Here you see it in use with my 40D and a CS f/2 50mm I picked up from Ron a month or two ago.

This is the very first revision and needs some tweaking.. infinity focus isn't there just yet, but I've got some leeway to move the lens closer to the sensor and have already modified the design and ordered another print.. ETA 1 week.

Even though this revision cant focus to infinity, I can still shoot intermediate range stuff all day long..

Here is the first photo ever taken with a CS lens properly mounted to a DSLR.
Shot with a Canon 40D & Mamiya CS f/2 50mm. Exp 1/60 at f/2 and 1250 iso.

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3D Printed Mamiya CS to EOS adapter ( http://shpws.me/llIh )
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xx Re: CS Lens to DSLR
« Reply #11 on: Oct 24th, 2011, 7:05pm »

Super here, too! cheesy

I have a Canon digital and loads of Mamiya NC1000 (CS) lenses! I could use a 42mm threaded adapter to Canon EOS, too!
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xx Re: CS Lens to DSLR
« Reply #12 on: Oct 24th, 2011, 7:20pm »

the m42 to EOS adapters are all over ebay. I got the one with the flange to depress the aperture pin when the lens is screwed in.. think i paid 5$ shipped from hongkong..

Mass production has its advantages.. the 3d prints are not quite that cheap sad
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3D Printed Mamiya CS to EOS adapter ( http://shpws.me/llIh )
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xx Re: CS Lens to DSLR
« Reply #13 on: Oct 25th, 2011, 12:34am »

I'ver never seen a m42-eos with flang, i do have one converter, but that just metal, no options, not even a af confirmation chip which are getting more standard on the Internet.

I like this development, i've a bunch of cs lenses...

Jasper
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xx Re: CS Lens to DSLR
« Reply #14 on: Oct 25th, 2011, 12:53am »

Chairman WOW!

Some shots with the CS Macro f/3.5 50mm w/ MacroCS extension tube, on the 40D & 580exII flash.
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(exposure 1/80 at f3.5 & 1250 iso)

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(1:1 crop of previous image)

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(exposure 1/80 at f3.5 & 1250 iso)

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(1:1 crop of previous image)

side note about the m42 to eos mounts, heres the adapter I got: http://tinyurl.com/3q842dn
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3D Printed Mamiya CS to EOS adapter ( http://shpws.me/llIh )
3D Printed Mamiya NC1000 P-Mount ( http://shpws.me/lmrA )
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