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Cleaning an SLT mirror

clk230 View Drop Down
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Joined: 25 June 2014
Country: Australia
Location: Adelaide
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Post Options Post Options   Quote clk230 Quote  Post ReplyReply Direct Link To This Post Topic: Cleaning an SLT mirror
    Posted: 25 March 2019 at 09:42
This post is not an endorsement or recommendation of what follows but information provided concerning something I tried at my own risk and that may be of interest to other Dyxum members.

I came across an A57 camera with a damaged mirror which I replaced with a spare part from Phototronic Services in New Zealand (many thanks Adam!), part number A1855640A. I was reliably informed this part fits all Sony APS-C SLT cameras.

I figured the old damaged mirror would be a good candidate for attempting to clean using the wet sensor cleaning method (e.g. Best sensor cleaning method?) to see if the cleaning solution or cleaning action would damage the mirror (even more than it was damaged already). A search of Dyxum revealed some previous discussions How to clean the mirror on the A77II? and Clean SLT mirror like you would the sensor? and sybersitizen's write up here The SLT Mirror: Construction, Durability, and Cleaning.

See the images below where it appears the mirror was successfully cleaned of dust and was not further damaged by the cleaning solution or cleaning action. Like others before me, I found mirror was delicate but not nearly as fragile as I had thought it might be. I used the wetted sensor swab on both sides of the mirror.



The tools

The replacement part

C & C always welcome

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icameisaw View Drop Down

Joined: 06 April 2018
Country: United Kingdom
Status: Offline
Posts: 20
Post Options Post Options   Quote icameisaw Quote  Post ReplyReply Direct Link To This Post Posted: 03 December 2019 at 15:35
Ah, thanks for this and the links.

The mirror seems to be the biggest weak spot with the SLT cameras - the sensor will vibrate to clean itself, but that's behind the mirror.

The mirror isn't(?) vibrated in the cleaning process, AND is the closest think to the big hole in the front of the camera, AND if you get stuff on it, it can show because the light for the sensor has to go through the mirror, AND it's fragile and just difficult to clean in general.

I can see why Sony has gone all in with mirror-less cameras...
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