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A77 and dust in sensor

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Post Options Post Options   Quote a77owner Quote  Post ReplyReply Direct Link To This Post Topic: A77 and dust in sensor
    Posted: 21 October 2018 at 07:35
I have the A77 and i have the following problem.The dust in sensor.I cleaned it before 4 months,and now needs cleaning..I don't change lenses.I use the Tamron 70-300 usd only.I changed in my home 3 times the lens,but only in the home.Not outside.I can't pay too often 20 euros for cleaning.Do you have problem like this?I use the camera for planespotting
Sorry for my English!
 



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SnowFella View Drop Down
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 08:08
Never read anything stating that the A77 is worse than any other SLT camera, dust is just one of those things that happen even if you keep one lens on or change all the time. Zoom lenses have a tendency to pump dust into the camera as they extend/contract so even keeping one lens on doesn't make it dust proof.

On a personal note though, my A77 is coming up on 100 000 shots and the sensor has never been wet cleaned. Nowadays it looks like I've sneezed into the mirror box if I stop down past F/9, biggest spots are still visible around F/5.6.
Haven't done an F/22 test in about a year but I suspect it would be ugly to say the least!
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Post Options Post Options   Quote Jozioau Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 08:32
At various times I have had reason to clean the sensors on my DSLT cameras (a99ii, a99 and a77ii). I use a 3 step process as necessary.
Firstly you go through the menus and select sensor cleaning mode and activate it.
Next carefully unclip the hold-down spring for the pellicle mirror, and then holding the camera face down, blow air across the sensor with a rocket blower.
Then refasten the pellicle mirror, re-attach a lens, stop down to f22 and take a shot of a clean background - a white wall or the sky, and check your image for dust bunnies.

If they are still visible, my next clean is done with a Visible Dust Arctic Butterfly charged fibreoptic brush.

If the spots are still there after testing, my last step is a wet clean using a drop or two of eclipse liquid onto a PecPad cloth wrapped onto a plastic sensor swipe.

All of these are readily viewable on YouTube.

If that's all too hard, then give it to a reputable camera service agency.
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a77owner View Drop Down
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Post Options Post Options   Quote a77owner Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 08:40
Thank you very much for the answer.
My camera has 46091 shots,and i gave it for cleaning in service about 10-12 times in 4 years...200 euros for cleaning...Too much i think...
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 08:47
Kalimera Your English is better then my Greek.

That is a lot of cleaning! And I hope that 200 price is a typo. You can clean it yourself, it is a little bit cheaper. Getting some dust at some point is unavoidable I guess, even if you do not change lenses. It might be the environment where you use your camera that plays a part. If it is dust, a small photographic blower might do the tric.
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Post Options Post Options   Quote a77owner Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 09:04
I pay 20 euros every time.Total for 10 times since 2014 200 euros!I will decide to buy a set for sensor cleaning.
Look how appears the sensor's dust in image.I did equalize a photo from yesterday spotting
1/600
F/9
ISO 100

 



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amrep View Drop Down
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Post Options Post Options   Quote amrep Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 09:38
The spots in this photo are all the same size. It doesn't look like normal dust on the sensor. You need to investigate what is going on.
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 10:09
Indeed look very large and strong to my eyes, how far in was it cropped and how much was it processed?
Here's one from just a few days ago out of my A77, 500mm lens, no crop and pushed in post to highlight the dust.


Sensor dust by Johan Olsson, on Flickr
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Post Options Post Options   Quote a77owner Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 10:47
The subject,the airplane,is about 300m far from the shoot point.The picture is the original,i did only resize,no crop and withoun processed except the equalize.
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 10:54
Looks like the spots would be about equal in size to mine then, maybe a tad more prominent from the equalize and slightly smaller aperture used.
I'm still living with cloning out mine in post but having serious thoughts about sending it in for a clean...local shop charges $90 for it.
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Post Options Post Options   Quote bartman Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 11:26
Because the spots are relatively large, maybe it's not de sensor causing this, but the lens. Start by cleaning the rear element with a blower and microfiber cloth.


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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 11:34
Originally posted by SnowFella SnowFella wrote:

Looks like the spots would be about equal in size to mine then, maybe a tad more prominent from the equalize and slightly smaller aperture used.
I'm still living with cloning out mine in post but having serious thoughts about sending it in for a clean...local shop charges $90 for it.


That is pricey - you should start by trying to clean it yourself. As long as you are careful you will not damage it, the worst that will happen is that you make it dirtier, which will not increase the cost of a professional clean.

A 10x jeweller's loupe and torch (v cheap) or a sensor loupe (pricey) will help a lot, enabling you to see the dust you are trying to remove. The important thing is not to use much pressure and not to use anything that might scratch the coating on the sensor filter (which is what you are actually cleaning).

My cleaning regime:

Step 1. Use the A77 sensor clean function. This will shake off loose dust. I will usually do it with no lens mounted and the mirror flipped up and the camera facing down. The idea being that dislodged dust will fall out of the camera and not hang around to find the sensor again. TBH it doesn't usually do much for me, but it doesn't always fail.

Step 2. A blower - the stronger the better. I do use canned air if normal blowers don't work, some believe this can leave residue on the sensor, I have never seen this. Again, mirror flipped up, camera facing down. This will often dislodge dust.

Step 3. Dry wipe - I have tried Q-tips on their own, but find it difficult to get the contact point to coincide with the dust spot. I now use a clean lens cloth wrapped around one. This gets rid of most spots.

Step 4. Wet wipe. Tried this yesterday wrapping a wet lens wipe around a Q-tip and it worked a treat. I would have used the plastic sensor wipe thingy's I bought a month or so back, but couldn't find them when I needed them!

To see spots I take a picture of a featureless sky (if available) with the lens stopped down as far as possibly (f22, 32 etc) in close focus MF. This saves faffing about with PP. In the shot below there are plenty of dust spots, but the only one that appeared in normal shots was the big one at the top.

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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 12:04
That 20 euro per clean is a very good deal, especially when you see a shop wanting 90 to do the same thing but I suspect they're not doing the same thing and I don't think that 20 euros is buying you a full wet clean. If it does involve a wet clean then they're just going through the motions and not checking their work to see if the sensor is clean, i.e. spotless. You'd be better off spending that money on a rocket blower, a wet swab kit and in your case an inspection loupe as that's going to be a tough one to clean. Not all of the bits that stick to a sensor are dust, some of it is little metal flakes coming from the deteriorating coating on the shutter leaves and if those are left to sit in place they'll develop a static bond to the sensor and can't simply be blown away. Once you do get the sensor clean try and make it a habit of cleaning the sensor with a rocket blower after every session to get whatever dust was generated or ingested out of the camera before it settles.
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Post Options Post Options   Quote der dickgg Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 12:18
If you want to find out where the spots are take a picture without lens of an A4 paper moving the body a little with long exposure time. You'll see the dots!

Edited by der dickgg - 21 October 2018 at 12:27
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