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Thread: Which C-mount adapter to buy?

  1. #1
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    Which C-mount adapter to buy?

    Hey all, I'm waiting patiently for my E-P1 but I want to start getting into the C-mount craze.

    I looked on eBay and I just saw one type of C-mount adapter
    This one http://cgi.ebay.com/16mm-C-Mount-len...3%3A1|294%3A50

    Is this the right one? I bought a Senko 25mm f/0.95 and a Canon-TV 25mm f/1.4 C-mount lens.

    Any help or links to C-mount adapters would be great! Thanks!!!

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    Re: Which C-mount adapter to buy?

    Don't know that adapter and I do not know about compatibilities with the E-P1.
    Look for jinfinance on eBay ("RJ adapter" is painted on the rim). Fabulous and works well with the Senko 25/0.95 on G1.

    I will be most interested to hear how you mange to use this lens on the E-P1.

  3. #3
    valtof
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    Re: Which C-mount adapter to buy?

    Hi wiregen,
    The really c-mount adapter to get is the one from Japan Exposures because once the lens fully screwed on it, its position can be adjusted to get the infinite and aperture marks right on top, see detail here (they are fast to ship it...) :

    http://www.japanexposures.com/shop/p...roducts_id=262

    By the way, could you be kind enough to post one or several picture of this Senko 25mm f/0.95 to see what it looks like ? Ideally just beside the little Canon TV16, since I also have it (you won't be disappointed by this one)...
    Cheers

  4. #4
    Senior Member Y.B.Hudson III's Avatar
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    Re: Which C-mount adapter to buy?

    I had frustrating experiences with the Japan Exposures c-mount adapter. It is a good idea, but the adjustment screws are very small and vibrate lose. I finally glued the rotating mount in place. The cine Lenses focus on infinity, but the machine vision video lens do not reach infinity.
    Last edited by Y.B.Hudson III; 28th June 2009 at 10:19. Reason: spelling

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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by Vivek View Post
    Don't know that adapter and I do not know about compatibilities with the E-P1.
    Look for jinfinance on eBay ("RJ adapter" is painted on the rim). Fabulous and works well with the Senko 25/0.95 on G1.

    I will be most interested to hear how you mange to use this lens on the E-P1.
    if im not mistaken the G1 and the E-P1 share the same mount and sensor distance correct? Theoretically it should work with no problem?

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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by wiregen View Post
    if im not mistaken the G1 and the E-P1 share the same mount and sensor distance correct? Theoretically it should work with no problem?
    Two issues:

    1. Robert (screen name here "monza") reported that some c-mount adapter may not mount on the E-P1.

    2. How would you focus with the E-P1 at f/0.95? Think about it.

    valtof:

    There is a pic here: http://shoprmaelectronics.com/index....ROD&ProdID=613

    It has no name engraved or painted. Filter thread is 40.5mm. That should give you an idea.

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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by Vivek View Post
    Two issues:

    1. Robert (screen name here "monza") reported that some c-mount adapter may not mount on the E-P1.

    2. How would you focus with the E-P1 at f/0.95? Think about it.

    valtof:

    There is a pic here: http://shoprmaelectronics.com/index....ROD&ProdID=613

    It has no name engraved or painted. Filter thread is 40.5mm. That should give you an idea.
    you got me thinking now. Should I wait until the rumored panasonic m4/3 body comes out or wait for olympus to release a EVF pen?

    I guess the best thing to do wait for the early adopters use these lenses and test the results I suppose

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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by wiregen View Post
    you got me thinking now. Should I wait until the rumored panasonic m4/3 body comes out or wait for olympus to release a EVF pen?

    I guess the best thing to do wait for the early adopters use these lenses and test the results I suppose
    Wait until an EVF is available for these small m4/3 cameras - both Panny and Oly will introduce it. Practically there's very little size difference between a G1 and a E-P1. As dpreview said, its all about style.

    Keith

  9. #9
    jcross
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    Re: Which C-mount adapter to buy?

    So, there are many more C-mount to Micro 4/3 adapters now...
    Which one to get?
    Any suggestions based on the last few months of use?

    I am quite interested in the cheap $38 ones on eBay, why not?

    Thanks!

  10. #10
    loa
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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by Vivek View Post
    Two issues:


    2. How would you focus with the E-P1 at f/0.95? Think about it.
    Hi Vivek-

    What am I missing here? Last night I was focussing a Schneider 25/0.95 at 0.95 on my e-p1... and it was WONDERFUL. so bright and easy to focus, far easier than my OM or kinoptik lenses. Sure the DOF is narrow but it's a lot easier than finding the focal plane on my OM 90/2!

    I'm confused!?

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    Senior Member pellicle's Avatar
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    Re: Which C-mount adapter to buy?

    Hi

    I use the hawkpeng adaptor, I see he's changed his ebay name. I like it a lot and it works better with some of my c mount than the RJ Camera one ... which I have OM as well as C mount of his.

    gad, I sound like some sort of adaptor collector.

    some stuff from my blog here and here

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    Re: Which C-mount adapter to buy?

    I have the Hawks Factory (aka Hawkpeng) W1 style C-Mount adapter which I use with the Robot camera mount flange. The W1 adapter has 3 tiny grub screws that allow for the mounting the flanges but is otherwise a standard C-Mount adapter.

    I also have the RJ Camera MFT to FT and FT to OM adapters. The Hawks Factory adapers appear to be made to tighter tollerences than the RJ Camera ones and things like rear the MFT rear lens cap fits much better. RJ Camera's own MFT rear lens cap doesn't even stay in place on their own adapters but they fit OK to Panasonic and Olympus lenses.

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    Senior Member pellicle's Avatar
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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by PeterB666 View Post
    RJ Camera's own MFT rear lens cap doesn't even stay in place on their own adapters but they fit OK to Panasonic and Olympus lenses.
    so its not just the batch I have ... hmmm

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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by loa View Post
    Hi Vivek-

    What am I missing here? Last night I was focussing a Schneider 25/0.95 at 0.95 on my e-p1... and it was WONDERFUL. so bright and easy to focus, far easier than my OM or kinoptik lenses. Sure the DOF is narrow but it's a lot easier than finding the focal plane on my OM 90/2!

    I'm confused!?
    Why not show some pictures that you find wonderful? I do not think we have seen samples from the Schneider 25/0.95, so far. The 25/0.95 will show quite bit of field curvature while the superlative 90/2 OM macro is a flat field lens. That could be the difference.

    Quote Originally Posted by jcross View Post
    So, there are many more C-mount to Micro 4/3 adapters now...
    Which one to get?
    Any suggestions based on the last few months of use?

    I am quite interested in the cheap $38 ones on eBay, why not?

    Thanks!

    As posted above, the RJ adapter.

  15. #15
    loa
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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by Vivek View Post
    Why not show some pictures that you find wonderful? I do not think we have seen samples from the Schneider 25/0.95, so far. The 25/0.95 will show quite bit of field curvature while the superlative 90/2 OM macro is a flat field lens. That could be the difference.
    It focusses wonderfully, no wonderful pix yet Seriously, I have nothing postworthy at the moment.

    I only had the lens out for a few minutes, on trial- I think I'm going to return it. It vignettes rather a lot (and i have a tolerance), has strange specular rings as you stop down, and is nearly as heavy as the camera. I'm using a red ground ginger spice bottle cap for a lens cap.

    OTOH, the focussing is, as mentioned, dreeeaaammy, and I measured it at 1 full stop brighter than the 20/1.7, so it's a real 0.95(ish). Sharpness seems reasonable altho I havent pixel-peeped. It fits perfectly into the hawkpeng adapter, perhaps 1mm to spare, and it looks good on the camera.

    I'm fairly sure I've seen this lens modded to a m4/3 mount, and claimed FF coverage. it certainly looks possible; the rear element is 5mm inset, at least. However I'm not going to try

    I may re-un-box it just to give y'all a look. I really appreciate all the knowledge I've gained here.

    david

  16. #16
    gjhzyy
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    Re: Which C-mount adapter to buy?

    Oh,I want to know too.

  17. #17
    loa
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    Re: Which C-mount adapter to buy?

    A few quick shots taken from around work. No PP. Resizing by Flickr. Out of cam jpgs.

    Schneider-Kreuznach 25mm/0.95

    iphone pix of it, overexposed for more visibility:


    the magic number, and the ginger spice cap:


    f/5.6:


    the rest are f/0.95. the flower one shows some reduced contrast and ghosting in the shadows of a bright sunny day.

    12 inches, .16inches DOF






    can provide larger versions. interested in your thoughts on the lens quality.
    Last edited by loa; 23rd October 2009 at 12:59.

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    Re: Which C-mount adapter to buy?

    David, Couple of thoughts:

    1. Not sure how good the lens' glass is (cell phone pics). If it is crystal clear without any blemishes, it should be fine. Even any filmy coating (front and rear) will reduce light transmission.

    2. The front rim needs to be painted matt black. The shiny rim (even the rim of any metal hoods) will induce flare.

    Super fast lenses will flare. I have not come across any that is immune to it.

    Looks sharp. While processing (RAW), you could use vignette control (all m4/3rds lenses use it, BTW) to minimize the dark corners.

    Contrast can be adjusted in the post as well.

    Exposure is tricky with such lenses (especially with such large light fall off). You can get it right only with practice.

    Thanks for posting.

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    Re: Which C-mount adapter to buy?

    Vignetting control may get some brightness back towards the corners but the real problem is that as the lens is designed for 16mm format, the corners are not just dim, there is nothing there to bring back.

    If vignetting is really a worry, shooting at 16:9 will help, otherwise, just crop the centre out.

  20. #20
    loa
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    Re: Which C-mount adapter to buy?

    Thanks for the comments. 6x6 is the only way you can get around the vignetting; even 16:9 doesn't cut it all out, unfortunately.

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    Re: Which C-mount adapter to buy?

    Hi

    nice ... I'll ask more in a while after I think about it ... looks good and Vignetting is quite acceptable. I'd like to compare it to my Computar ... but that's a 12mm

    wide open the Vignetting that isn't such an issue to crop out, but I do find that when I do it gives results which are essentially as wide as the 14-45 kit lens but inferior on the edges.

    It does do close focus nicely though



    this is uncropped

  22. #22
    jamesdang
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    Re: Which C-mount adapter to buy?

    I have a Senko 25mm f/0.95 and it did NOT fit into an RJ adapter w/o lens modification.

    I had to disassemble the rear focusing ring and file it down quite a bit. It works pretty well now. The vignetting seems to be the front 'hood' itself on the lens. However, if I file that down, I don't know how I'll attach filters...

  23. #23
    seb33
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    Re: Which C-mount adapter to buy?

    Quote Originally Posted by jamesdang View Post
    I have a Senko 25mm f/0.95 and it did NOT fit into an RJ adapter w/o lens modification.

    I had to disassemble the rear focusing ring and file it down quite a bit. It works pretty well now. The vignetting seems to be the front 'hood' itself on the lens. However, if I file that down, I don't know how I'll attach filters...
    What did you do exactly ? I'm about to buy that lens, and I have a common c mount GH1 adapter...
    Thank you

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