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  1. #21
    Erik Petersson's Avatar
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    Quote Originally Posted by Ian Grant View Post
    I'd look at buying the coated Skopar that's for sale in the classifieds here and fitting that to a Bessa 6x9. it'll be significantly better.

    An alternative was an excellent f2.8 105mm Xenotar that went unsold with an opening bidod £0.99 10 days ago, now relisted it's atracting more interest

    At the moment I'm waiting to find a 6x9 folder to fit a 105mm coated Trinar too.

    Ian
    This is interesting. The Helomar on my camera is easy to screw on and off. How do I know what lenses are possible to fit to the camera? I imagine that it would be important to calibrate the distance from the lens to the film.

  2. #22
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    Well the Skopar most probably came off a more modern Bessa 6x9 as it's front cell focussing . As the same camera was often sold with a choice of lens it's probable that the mounting flange is standard. In some cases the dealers fitted the lenses to certain cameras.

    That looks like a Compur 0 shutter with the Skopar, which is the same as my 105mm Trinar (again front cell focussing) so there's a very good chance it would fit, perhap with a shim to tweak it.

    Ian

  3. #23

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    Quote Originally Posted by Ian Grant View Post
    Well the Skopar most probably came off a more modern Bessa 6x9 as it's front cell focussing . As the same camera was often sold with a choice of lens it's probable that the mounting flange is standard. In some cases the dealers fitted the lenses to certain cameras.

    That looks like a Compur 0 shutter with the Skopar, which is the same as my 105mm Trinar (again front cell focussing) so there's a very good chance it would fit, perhap with a shim to tweak it.

    Ian
    Ian,

    The 105mm Color Skopar on my Bessa II does not focus by moving the front cell but by moving the entire lens. My understanding is that this was standard on all of the Bessa II cameras, regardless of date of production, and for sure mine is probably a fairly early production Bessa II as it lacks the built-on accessory shoe, though I do have a shoe that detaches.

    Sandy
    Last edited by sanking; 10-01-2009 at 03:45 PM. Click to view previous post history.

  4. #24

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    The Bessa (now often called Bessa I) uses unit focusing. It uses Voigtlander's favorite focus-by-dial method.

    My camera has a hinged pale yellow filter that can cover the lens for b/w. The Helomar in my camera sits in a Compur shutter, and it shouldn't be too difficult to replace that with a Skopar. If you're a purist, you would want to replace it with an uncoated lens. If not, a coated lens might work very nicely. I'm not sure what work would be involved, and whether a postwar lens would be in synch across the rangefinder focusing range of a prewar camera.

  5. #25
    JPD
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    Mike, the Color-Skopar on the Bessa I is front cell focusing. At least mine was.

    Erik, It should be possible to replace the Helomar with a Color-Skopar from a Bessa I. Since it's front-cell focusing you could adjust the infinity focus just by turning the front element instead of using shims.

    Here's the only photo taken with a RF-Bessa (Heliar) I have online, scanned from a 10x15cm print. It's a tad underexposed, but sharp enough.

    http://farm3.static.flickr.com/2393/...a98acbed_o.jpg

  6. #26

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    Here are a few test shots taken with various folders using triplet lenses.

    It isn't easy to try and show sharpness ina scan - especially with an old flatbed scanner like mine, so I made some big enlargements of about 50 by 50 cm. I only put a postcard sized paper under the enlarger at an interesting bit of the picture - but the negative was blown up to an enlarger wobbling 20 inch square. I've posted these alongside the full frame pics.

    The shots were all hand held, so of course it isn't a very serious test of the lenses, saying as much about the shutter speed and my shaky hands than anything - but it might give some idea.

    http://www.flickr.com/photos/2200641...7622501010876/
    Last edited by steven_e007; 10-02-2009 at 10:45 AM. Click to view previous post history.
    Steve

  7. #27
    Erik Petersson's Avatar
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    Thanks for your examples, Steve. This gives an idea of what can be expected under normal use. I still have a couple of frames to spend before my first E6-roll will be spent. Light is rather flat in Stockholm today which makes the exposure easier.

    I think I will wait a bit before byuing a second lens. Will learn the helomar first.

  8. #28

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    try focus bracketing. This is what I had to do with a circa 1918 Goerz folder. Result was a nice sharp 19" print on my wall that could have been shot with a new MF camera. I had to tape it up due to light leaks and various other things but once the focus was right it was super at landscape apertures (f16-f22)

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