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Thread: New RS 40mm HR W, any tips?

  1. #1
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    New RS 40mm HR W, any tips?

    Hi all,

    Maybe seems a little bit of redundant question considering it's a lens and not some kind of newfangled body, but thought I'd reach out as I have a new RS 40mm lens on it's way to me – via the factory to get mounted in a new copal shutter – and wondered if anyone could share some insight with regards to it's use / limitations / etc. while I wait. It may actually be quite a long wait, what with the Covid-19 virus causing havoc with global travel and trade...

    Anyway, Linhof and Studio have been awesome in arranging the mounting of the lens cells in the Copal 0 shutter. I use a Credo 60 on a Linhof Techno, so this is essential for me.

    I'm wondering what information people can offer on the following:

    1: I know there is a hard vignette / disk in the lens to limit movements past a certain point. In practice, if focusing in the middle distances, at what point does this show up? I've never once seen the disk when using my 70mm HR W lens, even when dropping the back a good 8mm and shifting +/- 17mm to create panoramic images. Different spec'd IC I know, but still...

    2: Distortion. How are people correcting the complex moustache distortion the lens exhibits? Any tips on this front?

    3: Diffraction. On the 60mpx FF sensor, how does diffraction look comparing f11 to f16?

    4: How fragile have people found the lens? I've heard reports that it requires somewhat special care when packing because of the stress the large lens cells puts on the shutter unit. Is this true?

    Anymore up to the minute info to share would be great, too. It's a well known, loved and tested lens at this point and I know a lot of people have reported on its performance, but maybe new versions of C1 etc have improved / changed things a bit over time?

    Anyway, looking forward to receiving mine. It has been a much missed FoV in my kit, and now my perfect three lens kit is complete – save for the fact that I'd like to replace my RS APO-SD with the Schneider 60mm XL...

    T
    Last edited by tjv; 1 Week Ago at 23:27.

  2. #2
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    Re: New RS 40mm HR W, any tips?

    I own two of the 40 HR lenses on different systems, one on Cambo WRS and one in copal shutter only for use on my Techno or Arca Swiss m-2.
    From my practically experiance the 40 HR is the lens that you can use so easy as no other rodenstock or schneider lens. The lens is very good at 8 and perfect at 11. Also at 16 there is bid issue used on 80 and 100MP backs. On your 60MP all these apertures will work great. I find the 40 HR better to work even with big movements as my 50 and 32 HR. the sharpness even at the end of the image circle is simply great and I never seen a lens that can do that.
    The Schneider Apo D. xl 60 mm is the sharpest schneider lens. I love the lens also, but it is not so easy to use, when you use bigger movements. Live view makes it easier, or you need the super bright screen from Linhof with Silvestri loup, to focus right on techno. A.D needs 11-16, at bigger movements 16 and it is not so easy to see and control the performents at the corners. But I amsure you would be happy with both lenses.
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  3. #3
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    Re: New RS 40mm HR W, any tips?

    Congratulations on your new lens acquisition! The 40HR will render beautifully on your Credo 60. I previously used this lens on an IQ160, which has the same Dalsa CCD sensor as your Credo. In terms of lens cast, the files are much cleaner than they are on my IQ3100, which replaced the IQ160. Unshifted, an LCC correction is almost optional on the Dalsa sensor. Typically I limit shifts to +/- 10mm which gives great results edge-to-edge. There's some lens cast when shifting on the IQ160 that I would always correct in post with an LCC file, but there are situations where one can get away without an LCC that wouldn't hold with the IQ3100. Capture One does a great job in cleaning things up in both cases but even after corrections I think the IQ160 files are a bit cleaner out at the edges.

    Here's an example image I made of my trusty test subject (a terra cotta lion that guards our garden) soon after picking up my 40HR and Cambo + IQ160, shot at f/11 or f/11.5 (forgot to write this down at the time), shifted +/- 10mm and stitched. The tonality and sharpness just blew me away.

    https://flic.kr/p/VNF9di

    The 70HR as you mention has a larger image circle - for that lens I find that I can shift out to +/- 15mm without issue (and with much less lens cast than the 40).

    The diameter of the Airy disc at f/11 is 14.7 microns (see https://www.cambridgeincolour.com/tu...hotography.htm), which puts this in the sweet spot in terms of Nyquist frequency of the 60 Mp sensor (6 micron pixel pitch, IIRC). I typically use the lens at f/11 but don't hesitate to stop down further if I need the extra depth of field as I find few things more frustrating than coming back to a sharp, out of focus image. Capture One does a pretty good job with diffraction correction, although I think this requires having the f/stop embedded in the metadata which can't easily be done post hoc. Others can chime in on this point.

    Perhaps I'm just not critical enough but I never really worried myself with correcting distortion on the 40HR, even when making the occasional architectural image.

    There have been differing points of view expressed in other threads here about how to handle and transport tech cam lenses - vertical vs horizontal, pointing up vs pointing down if vertical, etc. My take away from all this is to try to support the entire lens assembly to avoid placing torque on the front lens group. So far, I haven't had any issues with the 40 (knock on wood).

    Hope this helps and you're soon enjoying your new lens!

    John
    Last edited by jng; 1 Week Ago at 10:40.
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    Re: New RS 40mm HR W, any tips?

    Thanks guys!

    Iím thinking by now that itíll be a miracle if I see the lens within 6 weeks to a month. Things are grinding to a halt world over. Not much I can do now except wait I guess...

    Iím heartened by so many positive comments on the lens performance, I think itís going to be something of a magic bullet for my work.

    Having mostly shot 8x10Ē over the last two years itíll also be nice to work more quickly again with freedom of ongoing materials costs- although I did just panic order 5 boxes of HP5 and some PMK!

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    Re: New RS 40mm HR W, any tips?

    The 40HR is a really great lens! I have been using mine for about six years, first with a IQ160/IQ280 and now with IQ3100 Achromatic and Trichromatic.

    With the IQ160 and IQ280 I found it needed LLC on all shots - also with no shift. Obviously on the 100 Achromatic there's no color cast but only some vignetting. On the Trichromatic there's more color cast than on the 60/80 but it cleans up very nicely with LCC but I don't use a lot of shift.

    I mainly shoot landscapes and have never found distortion to be an issue, not even with the occasional buildings or light poles etc. in the frame.

    Regarding being fragile I usually have it mounted on my Cambo WRS with the back also mounted. I have made a foam cradle that supports the lens and carry it in an F-Stop ICU together with my other lenses and batteries etc..

    Enjoy the lens, hope it will get to you quickly despite the world being locked down.
    Peter
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    Senior Member dchew's Avatar
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    Re: New RS 40mm HR W, any tips?

    My only reservation with that lens is the focal length at 42mm. Ends up closer to a 28mm eq vs 24mm. I migrated to the sk35, but only for focal length reasons. The 40hr is the better lens in most other respects except distortion and size.

    The Alpa lens corrector is available for download here if you want to try it:
    http://www.alpa.ch/en/site/member-area

    I think you have to create an account to get there, but it is a simple, free process. Although I have not tried it, it should correct for the mustache distortion.

    Dave
    How glorious a greeting the sun gives the mountains! - John Muir

    davechewphotography.com
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    Re: New RS 40mm HR W, any tips?

    Canít add much to the material already added, but have a few thoughts.

    I moved from the SK43 to the Rodenstock 40mm while I was shooting the IQ260. The 43mm needed a CF for all shots, really and the 40mm did not.

    From my use, the 40mm is very sharp on center, but mine starts to fall off on shifting much past 10mm, as other note better shifting I will and have assumed I just received a bad copy. I found the lens would shift to just around 12mm/14mm before it hit the disc that is to show you the edge of the IC. But note as you approach this disc, you see other optical aberrations and the hard vignette created by the disk causes issues.

    My biggest issues on the 40mm are the same as the 32mm, in that once you shift it around 2mm, you will start to see issues due to the retro focus design, in that subjects to the edge become elongated an flattened. Both lenses do this the same amount for me, in that enough that I would not really want to shift the 40mm or 32mm past 10mm for a subject with known dimensions. There is no correction for this BTW in post by any software. But just shift it against a car, or building and you will see the effect immediately. My lenses are 2016 and 2014 copies, so with new glass Rodenstock may have fixed this, but when I sent images to Rodenstock via Arca, on the 32mm I was told ďthis is normalĒ.

    The 40mm I have shows a lot of chromatic aberration and when shifted this becomes worse. Can be fixed in post, CI does not do as good a job on it as LR.

    No problems with carrying it, and I believe the issues the OP mentioned are for the 32mm, which even Rodenstock as stated, should not be carried on camera/tripod etc in the field as itís too easy to dislodge the front part of the lens and then the lens is no longer aligned. 40mm is much smaller and lighter. Also, the 32mm might benefit from a CF, depending on the shot being taken.

    So for the 40mm, great lens, very sharp, distortion on shifts towards edge of frame (elongation and flattening), and note all wides in the retro focus design do this to some extent. F8 to F11 quite useable, even F16 (on 4150 shows effects of diffraction, but IMO can be corrected). NO CF needs, and has shift ability up to 12mm for sure maybe 15mm in certain situations.

    Paul C
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    Re: New RS 40mm HR W, any tips?

    Thanks all for your comments regarding the lens, it's all helpful.

    As luck would have it, Paula at Linhof Studio emailed to say the lens was delivered to her from Rodenstock early Ė factory mounted in copal Ė and will be shipped to me on Monday. Unless of course the world has shut down by that point... I'm always amazed at Linhof Studio's service. I wish I could be a local 'walk in' customer, but alas I live in New Zealand. Anyway, I highly recommend them and hope and pray they will weather this economic storm. It's going to be hard for a lot of people in the coming year, that's for sure.

    But the lens! I'm really looking forward to seeing what its limits are myself and contributing to the knowledge pool in due course. I'll be using it on my recently fine-tuned Linhof Techno for an ongoing project / commission. It's the final piece of the puzzle for my ideal kit, so fingers crossed it's all smooth sailing from here...
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