Author Archives: canonrepair

About canonrepair

Ruzsa János. Amatőr fotós, Canon DSLR váz. Amateur photographer. Canon DSLR user.

Canon EF (body-lens data) protocol

Posted on 2024. May 5. by canonrepair

Case You want to see, what happens between the camera and the lens, You will need n oscilloscope, or, better a logic analyser. This is a cheap chinese one – but for our purposes will be ok. Works for example … Continue reading →

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Button cell battery in Canon

Posted on 2024. March 15. by canonrepair

The older cameras use a CR1616 or similar non-rechargable battery, which has to be replaced after a certain time, without opening the camera. These batteries have to supply the internal clock. In a Canon 2000d, or for ex. in a … Continue reading →

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The chinese selector wheel and the good old soviet lathe

Posted on 2024. February 25. by canonrepair

As you know from my previous post, the chinese replacement wheel has a geometrical issue, so can not be used. As I have no time to wait for a new original part (and as the customer would not pay for … Continue reading →

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Separating lens doublets

Posted on 2024. February 17. by canonrepair

https://www.norlandprod.com/techrpts/separating.html And here is as a text: Separating Lenses BondedWith Norland Optical Adhesive The simplest method for separating a lens bonded with Norland Optical Adhesive is to immerse the lens in a solvent combination made up of the following: methylene … Continue reading →

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Be careful with replacement parts!!!

Posted on 2024. January 29. by canonrepair

As everybody else, I have to use chinese replacement parts. Flex cables for exaample a lot – and 99% they are ok. And sometimes I have to use replacement wheels – as Canon has invented the plastic/rubber wheels, where the … Continue reading →

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3D holder for a vise

Posted on 2024. January 21. by canonrepair

The base is an aluminium ring. The hemisphere is a plastic Christmas decoration. The filling: steel balls of 1 mm (could be sand). The plate is 3mm thick steel sheet, with a nut soldered on the middle. The vise has … Continue reading →

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Canon 24-70 f4 IS – replacing the aperture flex

Posted on 2024. January 21. by canonrepair

This time I have no time for a post. Just here you have the photos, case you need some help during reassembly. Please mark how I replaced the flex: the old flex was NOT desoldered, just cutted, and the soldering … Continue reading →

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The aperture or the board? This is the question…

Posted on 2023. September 10. by canonrepair

I had to repair a canon 17-55 f2.8 is. Simple case: error 01, broken aperture cable. Or not. After replacing the flex, assebly – does not work, just struggles to move the aperture. Shit. Disassebly. Inspecting the board under microscope. … Continue reading →

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How to… take out a stucked ROLLER

Posted on 2023. May 1. by canonrepair

I had to repair a Tamron lens – and the 6 rollers (in fact, just plastic positioning washer are stucked in the barrel. Take a BIGGER self-tapping screw. Screw it in the plastic part. Grab it with a tweezers or … Continue reading →

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Stuck screws in the lens

Posted on 2023. April 15. by canonrepair

Sometimes you have to disassemble lenses or cameras with stucked screws inside. In fact, you have only one trial: case the screw will not move with the first rotation, the phillips slot will be damaged – and you will get … Continue reading →

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