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12-14-2016, 03:49 PM   #1
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Replace front element on a Takumar 50mm 1.4 8 element

Hello,

I got my first tak, a beauty, but with scratches on the front element. I was wondering whether one can replace this with the front element of a SMC 7 element version, adding the advantage of a good coating, thereby making a true Super Takumar

Ideas or experiences anyone?

regards Huib

12-14-2016, 04:04 PM - 1 Like   #2
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I doubt it since the optical formulas will be way different between 7 and 8 elements.
12-14-2016, 04:08 PM   #3
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yeah thought so too, but which part was adapted? Front lens scheme looks the same...
12-14-2016, 04:22 PM   #4
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QuoteOriginally posted by huibgeselschap Quote
Hello,

I got my first tak, a beauty, but with scratches on the front element. I was wondering whether one can replace this with the front element of a SMC 7 element version, adding the advantage of a good coating, thereby making a true Super Takumar

Ideas or experiences anyone?

regards Huib
Try and see if it works. I did plenty of DIY experiments with this kind of swaps and with some Minolta fast glass it worked even better when swapped, but usually the results were usable to mediocre. anyway, it does not hurt to try.

12-14-2016, 04:33 PM   #5
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Difficult to tell from the lens diagrams. First element looks similar if not the same. Doesn't hurt to try, especially if you have a spare
7 element lying around.
12-14-2016, 04:34 PM - 1 Like   #6
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Scratches are cosmetically unappealing but it takes a surprising amount of damage to the front element before if becomes apparent in an image. The only
concern might be if you were to catch a sun flare off of the scratch. I'd say take it out and shoot it up as is, you might be pleasantly surprised.
12-14-2016, 08:00 PM   #7
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If there is no coating on the 8 element's front element, wouldn't it be better to buy up some 14,000+ grit diamond paste and try to buff the scratches out with a jeweler's buffing wheel?
12-14-2016, 08:25 PM   #8
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Don't polish it!

The Super Takumar 8-element 50/1.4 is probably coated. It likely isn't coated using the more sophisticated, patented Super-Multi-Coating process Asahi purchased in 1971 from Optical Coatings Labs in California, though it is quite possible some late 7-element Super Takumars received multi-layer coating.

Article on S-M-C from Asahi Optical Historical Club.


Last edited by monochrome; 12-14-2016 at 08:31 PM.
12-15-2016, 12:11 PM   #9
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polishing also changes the lens itself if only slightly, i guess enough to have an impact. It takes photos just nicely now. Would be interesting if some one has experience with changing front elements, meanwhile I will enjoy my Tak, probably get a new Canon (100D) to go with it, so I can focus using live view and make the most of the very shallow DOF
12-15-2016, 12:17 PM   #10
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I've heard of (esp. reporters) doing this, but you might try taking a china marker or sharpie and very carefully blacking out the scratches. It'll keep them from catching light and showing up as bright, ugly marks in your photos. You'll still have the same (prob. minor) loss of sharpness, contrast, etc, but not the gnarly glare.
12-15-2016, 12:29 PM   #11
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hmmmm sounds like commando style.... I'll first will try to make a photo that shows up effects from the scratches. Here an example that one needs a lenshood... Will use the Ihaghee shade from by biotar next time... also a picture of the christmas tree on the Cologne christmas market, the 1.4 at high ISO still produced a picture that is kinda nice. missing my tripod at the time!!!
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12-15-2016, 12:51 PM   #12
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In this case I think blacking out the scratches would help, esp. with the rainbows in your first image. A colleague of mine once took a permanent marker to the front elements of his Nikkor 20-35. Even on that very wide lens with a not terribly useful hood it caused a substantial improvement. Hard to watch, but ultimately effective.
12-15-2016, 01:41 PM   #13
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I was standing right under an arch of christmas lights when I created those rainbows, flare conditions couldnt get worse.

Here a photo from the front element, taken through the lens from behind with my phone... looks not nice (it is magnified) , next photo taken from the side, no apparent scratches. Lesson for all; watch out what you use for cleaning your lenses...
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Last edited by huibgeselschap; 12-15-2016 at 03:03 PM.
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