FAQ FAQ  Forum Search   Events   Register Register  Login Login

Cleaning SLT mirrors

Author
brettania View Drop Down
Admin Group
Admin Group
Dyxum factotum

Joined: 17 July 2005
Country: New Zealand
Location: Auckland
Status: Offline
Posts: 20650
Post Options Post Options   Quote brettania Quote  Post ReplyReply Direct Link To This Post Topic: Cleaning SLT mirrors
    Posted: 10 December 2013 at 02:02
I have found that while we have an article on cleaning the sensor of a DSLR, there is nothing about cleaning the mirror of a SLT.

Any volunteers?

For reference/example purposes see MiPr's "Cleaning the sensor in your camera" -- here. Also there is a current discussion on SLT mirrors here.

Edited by rovhazman - 10 December 2013 at 14:43
 



Back to Top
MediaArchivist View Drop Down
Senior Member
Senior Member

Joined: 13 July 2012
Country: United States
Location: DC Metro Area
Status: Offline
Posts: 1115
Post Options Post Options   Quote MediaArchivist Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2013 at 02:39
The worst dirty mirror situations I have ever had were not very bad. Mostly a few dust (or whatever) specks here and there, on both sides. My technique is to flip the mirror up, then use a can of compressed air (with the mini straw they always come with) to squirt a few blasts over each side. The air is blowing roughly parallel to the mirror surface, and this dislodges even the most stubborn dry specks.

Once I found a speck that would not budge at all, this was on the front side of the mirror (not the side that faces the sensor), about 4mm from the lower left corner. I was unable to find a sample situation where the speck could be seen in a photo, even at the smallest apertures (the 135STF goes as small as f/32). Nonetheless, it was annoying. I used a q-tip with the greatest of care, but that %&#* speck still would not budge! Finally, I held the q-tip over some steaming water for a few seconds to get it ever so slightly moistened, then tried again. This completely removed the speck! If I look at the mirror really close, at a particular angle with light at a particular angle, I can now see what appear to be very slight scratches in the same direction and place where I swabbed with the q-tip. They are less noticeable than the original spec, and I cannot find any effect on the images at all.

You can clean the SLT mirror most of the time with a good blast of air directed across the surface— not directly at it! After that, I have never been more bold than a slightly moistened q-tip, and even that I am not sure I will do again :)
α99ii • lenses used incorrectly ➜ roXplosion!
Back to Top
sybersitizen View Drop Down
Senior Member
Senior Member

Joined: 04 August 2006
Country: United States
Location: California
Status: Offline
Posts: 14126
Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2013 at 03:18
Mirror cleaning is an odd subject. For one thing, it is technically forbidden in all the user manuals to use anything but a blower within the mirror box, so I doubt there will ever be any official instructions for cleaning that involves physical contact. Secondly, the mirrors used in the various SLT models might not all be made of identical materials, so they might respond differently to different cleaning techniques. That said, for my A55 mirror cleaning, I find just two tools are needed:

1. A tiny artist's brush to handle 95% of the jobs. Whenever I notice a dust particle I gently lift it off with this brush and I'm done.

2. A clean cotton swab for the other 5%. I used this to clean a fingerprint I accidentally put on the front surface long ago, and I think one other time for something that I don't remember clearly. I wipe lightly without applying pressure. If needed, I also breathe on the mirror to add a little moisture.

Regarding removal for cleaning, I've so far never needed to do that. (I have removed the mirror temporarily on a number of occasions, but I only do it for special experimental shooting sessions.)

Remember that the mirror is an extremely thin, pliable, and deformable plastic film, so treat it accordingly. I just measured its thickness with a micrometer at less than 0.004", the same as a sheet of standard copier paper. Fortunately, the front surface of the mirror is smooth, and things don't really like to stick to it all that well. If something tenacious gets on the back of the mirror, that might be an issue. That side feels very 'grabby' compared to the front. According to a published patent description, one side of the mirror is coated with several special refractive layers... but is it the front or the back? Hmmm... Either way, I prefer to avoid having to mess with the back side.

Edited by sybersitizen - 10 December 2013 at 17:32
Back to Top
lomitamike View Drop Down
Senior Member
Senior Member

Joined: 23 September 2006
Country: United States
Location: CA.
Status: Offline
Posts: 706
Post Options Post Options   Quote lomitamike Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2013 at 04:58
Here's a helpful video of how to replace the mirror on a A55. I used tho video to educate myself before I attempted to remove and clean some stubborn dirt that needed a wet cleaning with some Eclipse cleaning fluid on a Pec pad.
I was very nervous to attempt this for my first time. The plastic frame that holds the mirror will get a little scratched and dented if you use a small screwdriver like the one used in the video. That shouldn't be a problem though, you won't need to do this very often.
Just be absolutely sure not to touch the mirror with anything more then your Pec pad or brush. You'll be surprised how easy they scratch.
A900, A850, A6000, Canon S95, SAL 70-400, 70-200, 35/1.4, 50/1.4. KM 85D, 28-75D, 17-35D,100macroD. Mino 28/2, 35-70. Rok14/2.8. Many flashes, Phottix Odin. E16-50, 18-200LE, 50/1.8, Rokfish 8mm
Back to Top
lomitamike View Drop Down
Senior Member
Senior Member

Joined: 23 September 2006
Country: United States
Location: CA.
Status: Offline
Posts: 706
Post Options Post Options   Quote lomitamike Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2013 at 05:02
Another a77 video


Edited by brettania - 10 December 2013 at 06:47
A900, A850, A6000, Canon S95, SAL 70-400, 70-200, 35/1.4, 50/1.4. KM 85D, 28-75D, 17-35D,100macroD. Mino 28/2, 35-70. Rok14/2.8. Many flashes, Phottix Odin. E16-50, 18-200LE, 50/1.8, Rokfish 8mm
Back to Top
Gert van den Bosch View Drop Down
Senior Member
Senior Member

Joined: 06 June 2012
Country: Netherlands
Location: Zaltbommel
Status: Offline
Posts: 2655
Post Options Post Options   Quote Gert van den Bosch Quote  Post ReplyReply Direct Link To This Post Posted: 30 December 2013 at 10:36
For cleaning my A550 and A100 my Artic butterfly works very fine. I always do the cleaning myself. Up untill now I still don't dare to do it with my A58 SLT. I am a frequent lens changer, everywhere. So I think the time has come to clean and I am very curious how to do it, as the mirror does not move to above.
I like down to earth photography. :)
 



Back to Top
rickztahone View Drop Down
Senior Member
Senior Member

Joined: 11 June 2011
Country: United States
Location: Pacoima CA
Status: Offline
Posts: 4855
Post Options Post Options   Quote rickztahone Quote  Post ReplyReply Direct Link To This Post Posted: 30 December 2013 at 15:17
Great links to those videos Mike. It literally took that guy less than a minute to replace.
a99+VG|a77+VG|a55|Nex6|HVL-56/58|minO|58 1.2|24|Tam|90|SAL||16-50|70-200|∑|50 1.4|∑| 24-70 2.8
[URL=http://www.flickr.com/photos/rickztahone/]Flickr
Back to Top
bigal5000 View Drop Down
Newbie
Newbie

Joined: 07 January 2014
Status: Offline
Posts: 4
Post Options Post Options   Quote bigal5000 Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2014 at 13:35
Originally posted by lomitamike lomitamike wrote:

Here's a helpful video of how to replace the mirror on a A55. I used tho video to educate myself before I attempted to remove and clean some stubborn dirt that needed a wet cleaning with some Eclipse cleaning fluid on a Pec pad.
I was very nervous to attempt this for my first time. The plastic frame that holds the mirror will get a little scratched and dented if you use a small screwdriver like the one used in the video. That shouldn't be a problem though, you won't need to do this very often.
Just be absolutely sure not to touch the mirror with anything more then your Pec pad or brush. You'll be surprised how easy they scratch.

How come the guy can't talk?
Back to Top
neilt3 View Drop Down
Senior Member
Senior Member

Joined: 13 September 2010
Country: United Kingdom
Location: Manchester.U.K
Status: Online
Posts: 2225
Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2014 at 19:07
Originally posted by bigal5000 bigal5000 wrote:

Originally posted by lomitamike lomitamike wrote:

Here's a helpful video of how to replace the mirror on a A55. I used tho video to educate myself before I attempted to remove and clean some stubborn dirt that needed a wet cleaning with some Eclipse cleaning fluid on a Pec pad.
I was very nervous to attempt this for my first time. The plastic frame that holds the mirror will get a little scratched and dented if you use a small screwdriver like the one used in the video. That shouldn't be a problem though, you won't need to do this very often.
Just be absolutely sure not to touch the mirror with anything more then your Pec pad or brush. You'll be surprised how easy they scratch.

How come the guy can't talk?


Tonsillitis ?

I guess he felt just showing people how to do was enough , regardless of what language you speak .
I've always got away with just using a blower bulb to clear dust off my slt mirrors .
It's only the sensors of dslr's and nex's that I've had to give a more thorough clean , using a blower and "lens pen " .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
Back to Top
Dyxum main page >  Forum Home > Dyxum Community > Knowledge Base

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.125 seconds.

Monitor calibration strip

Dyxum.com - Home of the alpha system photographer

In memory of Cameron Hill - brettania

Feel free to contact us if needed.