Wide: Tokina RMC 28mm F/2.8, Tamron Adaptall 2 28mm F/2.5, Sun Optical 28mm F/2.5, Super paragon 28mm F/2.8, Sigma filtermatic 24mm F/2.8, Fujinon 35mm F/2.8, Sun Optical 35mm F/2.8 Mirrorless: Panasonic DMC-G1, Sony NEX-5N When I've tried it, maximum focus distance has been greatly reduced to a few meters.ĭSLR: Canon EOS 60D, Samsung GX-1S (Pentax *ist DS2) Anyone know how they are achieving that with just the rear element flipped? But these sellers claim the lens will still focus to infinity. PaulĬanon 5D Mii, Canon 40D, Canon 350D IR, Sony A7 Mii, Sony Alpha-6000, a ton of lenses: AF & MF and too many cameras to count, all formats: 110 - 4x5.įatdeeman wrote: I see people selling them on ebay as Petzval mod (front element)īut also "trioplan mod" which sounds like the rear element, as doing the rear makes the bubble bokeh. I next screwed the lens into a thin M42-Emount helical and took a few photos in the garden. I removed the front element and put it back in reversed - it does touch the 2nd element a bit, since I didn't take the time to make up a spacer as suggested. You see, I have this Helios 44-2 58mm f/2 with a hopelessly stuck helical, so. Pdccameras wrote: As soon as I read this post, I knew I had to give this mod a whirl (pun intended). I assume that's what the washer described is for, but I'm sure it's worth making it clear! Just a word of caution about flipping elements without checking clearances can result in elements touching, a little force and damage will occur. One photographers junk lens is an artists favorite tool. Lightshow wrote: Just a word of caution about flipping elements without checking clearances can result in elements touching, a little force and damage will occur. I think options 3 & 4 will work best with APS-C sensors.Īlex ph wrote: Very interesting and speaking for itself! Thank you for sharing the examples. Gawn_dijitul wrote: Outstanding replies so far. With rear reversed, minimum focus was about 40cm and maximum focus distance was 2 meters. With front and rear reversed, minimum focus was a bit more than 50cm and maximum focus was to infinity or a bit beyond. On my 5D, with the front element reversed, minimum focus became about 55cm and maximum focus went far beyond infinity Normal minimum focus distance is about 50cm. Helios 44-2, all at f/2, near minimum focus distance, on my Canon 5D :Īnd the focus range changes when elements are reversed. Has anyone done a comparison of the Helios 44 (any version) as follows?Ībsolutely! I love playing around with my 44-2. Posted: Mon 7:23 am Post subject: Re: ? Helios 44 - Flip/Reverse Front or Rear Element or Bot Location: Mid North Coast NSW - Australia This also lengthened the focal length and significantly boosted the contrast etc!ĮDGARVE wrote: I have modified one with the front lens and it requires a washer of the following measures exterior 30.5mm, interior 28.7mm, thickness 1.4mm, this is put before replacing the lens and the results here I leave, The data of the washer I saw it in a video that was on youtube The experiment also caused me to try a 105mm lens without the badly fogged rear group. Gawn_dijitul wrote: Has anyone done a comparison of the Helios 44 (any version) as follows?ĭConvert wrote: I've heard of flipping the front element to produce a soft focus lens, but not the rear one.Īlthough I've not tried it quite like this I have removed the rear group from a different normal lens to produce a soft focus lens (of somewhat longer focal length) necessitating extension/bellows for focusing. Posted: Sun 1:19 pm Post subject: ? Helios 44 - Flip/Reverse Front or Rear Element or Both ?
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