Featured Pentacon Six TL

Discussion in 'Medium and Large Format Cameras' started by yohan, Aug 27, 2015.

  1. yohan

    yohan FF Regular

    34
    Mar 27, 2015
    yohan
    • Like Like x 6
  2. jai

    jai FF Regular

    68
    Apr 8, 2015
    Great mood to these :)
     
  3. rbelyell

    rbelyell FF Rookie

    11
    May 19, 2015
    tony
    love the series. love the camera and what you did here. let me recommend the biometar 120/2.8, which is my all time favorite long portrait lens.
     
    • Like Like x 1
  4. yohan

    yohan FF Regular

    34
    Mar 27, 2015
    yohan
    thanks. I was looking at that lens. will have to see how finances look! certainly good to have some real world opinion of it. thanks.
     
  5. yohan

    yohan FF Regular

    34
    Mar 27, 2015
    yohan
    Last edited: Nov 28, 2015
    • Like Like x 3
  6. MoonMind

    MoonMind FF Regular Subscribing Member

    180
    Mar 24, 2015
    Switzerland
    Matt
    I have this camera as well and love shooting it; the Biometar is a very nice lens - small, yet capable. Unfortunately, mine's quite radioactive - uncomfortably so, front (clearly) heavier than rear. Only the zebra'd ones are affected, btw. (see below) My Flektogon's rear lens is radioactive as well, but no radiation is detectable outside the body or the lens barrel, so I'm basically fine with carrying it around all day. The Biometar - less so. The original (Thorium-related) alpha radiation isn't that much of a risk as long as you don't swallow any glass fragments - but among the daughter products are gamma emitters as well, and my lens is old enough to contain some of them in detectable quantities. The amount of radiation isn't critical for occasional use in principle - just a bit high for extended and regular use. Just a heads-up, and remember: Only original zebra'd (lenses with polished strips of metal on both the focus and aperture ring) are affected.

    M.
     
    • Useful Useful x 1
  7. Amin Sabet

    Amin Sabet Administrator

    141
    Mar 22, 2015
    Amin Sabet
    Beautiful images, @yohan@yohan !
     
    • Like Like x 1
  8. MoonMind

    MoonMind FF Regular Subscribing Member

    180
    Mar 24, 2015
    Switzerland
    Matt
    Here's the "zebra'd" Flektogon mounted; images from the camera to follow (probably towards the end of the month, though - have to get them to the lab first).
    full.

    M.
     
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  9. phigmov

    phigmov FF Regular Subscribing Member

    169
    Mar 23, 2015
    Wow! Love those clean lines. The craftsmanship on cameras from that era was impressive.
     
    • Agree Agree x 1
  10. MoonMind

    MoonMind FF Regular Subscribing Member

    180
    Mar 24, 2015
    Switzerland
    Matt
    At danger of boring you all, I've something else: Within each system, there are good lenses - and legends. One of the Praktisix/Pentacon Six legends is the "Olympia" Sonnar 180mm f/2.8 - this (it came with hood and front cap):
    full.

    :D

    M.
     
    • Like Like x 3
  11. MoonMind

    MoonMind FF Regular Subscribing Member

    180
    Mar 24, 2015
    Switzerland
    Matt
    Now for the bad (well, a little worse) news: I looked into the "hot lens" issue a bit deeper - and discovered that the rear element of my Flektogon 50mm f/4 is blazing:
    full.

    For reference: 0.2 microsievert per hour is the average background world-wide; in my flat, it's actually 0.16 usv/h. This means that the radiation directly on the rear element is 27 times the usual radiation level. That said, it's not quite as bad as it looks; firstly, it's a contained and very limited source, and it's directional - the outside of the lens is completely safe, as is the front element. Secondly, the body shields the radiation from the lens *completely* (I get *no* extra radition once the lens is mounted) - which means that there's probably hardly any high-energy gamma radiation around. Alpha radiation will be stopped by every surface anyway (i.e. the mirror will absorb it), and beta also doesn't make it out of the body, not even through the focus screen (I looked ...).

    What I didn't take an image of is the situation with the zebra'd Biometar 80mm f/2.8; radition is not that high, but it's enveloping the lens (it's strongest right at the elements, but measurably higher than background all around), and it's *not* contained by the body once mounted - so there's gamma radition involved, probably from Radon, a daughter element of Thorium. Now, outside readings are far from dangerous, absolutely fine for casual use, but solidly twice as high as the average. Carrying the camera in a bag will probably shield your body from getting exposed, but you'll get a little extra exposure when using the camera. You'll get loads more from a common X-ray and at least twice this amount *as a full body dose* when flying - so while using the lens is potentially not without risk, it's actually very remote.

    M.
     
    • Informative Informative x 3
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