June 23, 2018, 04:44:02 AM

Author Topic: I Repaired my own 50mm 1.4, and so can you!  (Read 55707 times)

Valvebounce

  • Canon EF 400mm f/2.8L IS II
  • *********
  • Posts: 3760
  • Doing my best to get all of this to work together.
Re: I Repaired my own 50mm 1.4, and so can you!
« Reply #30 on: September 06, 2013, 02:46:53 PM »
Hi, a good question but I would think that with solder being so soft a layer thick enough to actually have a reinforcing effect would be very thick. However if there is enough space a helper layer could possibly be fabricated from a similar metal and soldered in to place, solder would be strong enough in its intended use for this.
However I would not do this without looking at the mechanism from an engineering stand point as strengthening that part will impart more force to the next weakest link and cause that to fail instead. The next weakest point could be the gear teeth or some other part that is not bend back in to shape able!

Cheers Graham.


By the way, metal becomes harder and stronger if you bend it a few times, so the resistance to bending improves. On the other hand it will also get more brittle so it will break more easily.

Out of curiosity, is there enough clearance that you could add a layer of solder to thicken the metal piece in question?
7DII+Grip, 1DsIII, 7D+Grip, 40D+Grip, EF 24-105 f4L EF-S 17-85, EF-S 10-22, EF 70-200 f2.8 L IS II, EF 1.4xIII, 2xIII, EF 100-400 f/4.5-5.6l IS II, Σ17-70 f2.8-4 C, EF 50mm f1.8, YN600EX-RT, YN-E3-RT, Filters, Remotes, Macro tubes, Tripods, heads etc!

1DsIII, 20D, 24-105, 17-85, Nifty 50 pre owned

canon rumors FORUM

Re: I Repaired my own 50mm 1.4, and so can you!
« Reply #30 on: September 06, 2013, 02:46:53 PM »

ajfotofilmagem

  • Canon EF 300mm f/2.8L IS II
  • ********
  • Posts: 2222
Re: I Repaired my own 50mm 1.4, and so can you!
« Reply #31 on: September 06, 2013, 04:38:02 PM »
Canon 50mm F1.4 is an example where the lens hood prevents the front element is pressed, and damaging the autofocus mechanism. Never removed the lens hood of my.

KyleSTL

  • EOS 6D Mark II
  • *****
  • Posts: 422
Re: I Repaired my own 50mm 1.4, and so can you!
« Reply #32 on: September 06, 2013, 05:19:18 PM »
As someone who has turned thousands of screws on cameras and lenses, be aware that although the screws look like Phillips head, they are in fact not.  If you would like to prevent damage to screw heads and be able to properly tighten everything upon reassembly, a set of JIS (Japanese Industrial Standard) screwdrivers is recommended.  I own an recommend Moody Tools in the USA, as they are one of the few tool makers still making JIS and supplying them in the US.

I went through 3 sets of Phillips micro screwdrivers before I said "enough" and special ordered a set of JIS on Amazon.  After receiving them and using them, I question why it took me so long to take the plunge.  If you intend to fix one lens one time, Phillips will do just fine, if you think you might start playing around with other broken cameras or lenses it's worth it to pick up a set.  Magnetic handles are handy, JIS #0 and JIS #00 will take care of 99% of the screws in a camera or lens.

http://www.moodytools.com/MTI_CATALOG_PAGE_11.pdf
Canon EOS 5D | Sigma 17-35mm f/2.8-4 DG | 24-105mm f/4L IS USM | 70-300mm f4-5.6 IS USM
15mm f/2.8 Fisheye | 28mm f/1.8 USM | 50mm f/1.4 USM | 85mm f/1.8 USM | 550EX | 3x 420EX | ST-E2 | Canon S90 | SD600 w/ WP-DC4

KyleSTL

  • EOS 6D Mark II
  • *****
  • Posts: 422
Re: I Repaired my own 50mm 1.4, and so can you!
« Reply #33 on: September 08, 2013, 11:38:16 AM »
Thought I'd update the thread with my success today.  I replaced the aperture in a 24-105L and it is working flawlessly.  Total amount spent - $418.18.  Not bad considering it was my first L lens.  One thing I learned while disassembling it is that it has two apertures.  One normal aperture for stopping down, and another secondary aperture that closes down based on focal length (to keep the aperture constant throughout the zoom range (without it I'm guess this lens would be a 24-105mm f/2.8-4).  The standard aperture in the 24-105mm is 8-bladed, the secondary aperture is 9.  Just thought you would all find that interesting.

EDIT: I used these two videos to help guide me through the process -
https://www.youtube.com/watch?v=hFR7ZG341kQ
https://www.youtube.com/watch?v=mRUTrNoDD1M
« Last Edit: September 08, 2013, 11:48:46 AM by KyleSTL »
Canon EOS 5D | Sigma 17-35mm f/2.8-4 DG | 24-105mm f/4L IS USM | 70-300mm f4-5.6 IS USM
15mm f/2.8 Fisheye | 28mm f/1.8 USM | 50mm f/1.4 USM | 85mm f/1.8 USM | 550EX | 3x 420EX | ST-E2 | Canon S90 | SD600 w/ WP-DC4

mrsfotografie

  • EOS-1D X Mark II
  • *******
  • Posts: 1623
  • M.R.S. Fotografie www.mrsfotografie.nl
    • MRS fotografie
Re: I Repaired my own 50mm 1.4, and so can you!
« Reply #34 on: September 08, 2013, 12:18:06 PM »
Thought I'd update the thread with my success today.  I replaced the aperture in a 24-105L and it is working flawlessly.  Total amount spent - $418.18.  Not bad considering it was my first L lens.  One thing I learned while disassembling it is that it has two apertures.  One normal aperture for stopping down, and another secondary aperture that closes down based on focal length (to keep the aperture constant throughout the zoom range (without it I'm guess this lens would be a 24-105mm f/2.8-4).  The standard aperture in the 24-105mm is 8-bladed, the secondary aperture is 9.  Just thought you would all find that interesting.

EDIT: I used these two videos to help guide me through the process -
https://www.youtube.com/watch?v=hFR7ZG341kQ
https://www.youtube.com/watch?v=mRUTrNoDD1M

Thanks, that is interesting because it answers a question that I had in the back of my mind for a long time, ie how a constant aperture zoom works. I always suspected that the aperture is stopped down automatically at the wide end but its surprising to me that there's a second aperture in there, actually!
5D3, 5D2, G5X, G16 | SY14/2.8, V20/3.5, 28/2.8 IS, Ʃ35/1.4, 50/1.8, 50/1.8 STM, Ʃ50/1.4 EX, 100/2.8L IS Macro, 16-35/4L IS, 24-105/4L IS, 70-200/2.8L IS II, 1.4x II, 2.0x III, 70-300L IS, Ʃ150-600 OS HSM S

canon rumors FORUM

Re: I Repaired my own 50mm 1.4, and so can you!
« Reply #34 on: September 08, 2013, 12:18:06 PM »