Skip to main content

My Photographic Future, Part 3.5 - Report From The Field on Sony

A year ago I wrote about avoiding the Sony α77, and I gave a reason why: the apparent fragility of the pellicle mirror. To whit it would appear that any dirt that attaches to the mirror and cannot be easily removed by simple blowing or other cleaning means requires a trip to the factory for cleaning or possible replacement. This was brought up by Imaging Resources, and bears repeating again:
From what we can tell, there is no strategy for keeping dust off the translucent mirror, except to blow the surface gently with air; it cannot be cleaned, and should never be touched. A fingerprint would require replacement at a service center.
Fast forward to Kirk Tuck, who has transitioned to using the Sony α77 for the main body of his work. In today's post on his blog where he documents using the Sony's for food photography, he had this to say:
I am happy with the Sony a77 with one exception: While the sensor cleaning works perfectly (vibrates at shut down) nothing is ever cleaning off the fixed mirror. When I shot at f11 I found two big dust spots and was unable to dislodge them from the mirror with puffs of air. I'm taking Sony at their word that we shouldn't use anything to physically touch the mirror surface. But it will bite if I [can't] figure out a way to clean dust spots off, short of sending the bodies back to Sony for periodic cleaning.

The Nex 7 is superior in this regard.
I would also like to point out that Kirk left a comment on my year-ago post about not worrying so much about the pellicle mirror:
I owned a Canon RT with the pellicle mirror and one of the selling points was the extremely short shutter lag. Something like 22 ms. I owned the camera for years and at first I was worried about dust on the mirror but it's far enough away from the imaging plane that it was never in focus. A little compressed air was enough for any small trash on the front. Also consider that they may have an IR or other filter in front of the mirror like Kodak did with their 660 and 760 cameras which would block intrusion of dust and allow user cleaning of the outside surface. Win, win, win. I don't think Sony would let this one off the leash without having dealt with a very obvious possible source of customer dissatisfaction. We'll see.
This is an example of why it is so important to pay attention to bloggers like Kirk. He buys non-trivial equipment and uses it substantially in the course of his work. This makes it statistically significant that he will find a problem before just about anyone else, and if he does, Kirk will certainly write about it. I've not known Kirk to ever hold back writing about camera gear issues.

Why do I care? Because I live in a rather messy environment, central Florida, and the periodic summer monsoon season. I've written repeatedly about how my cameras would be covered in condensation just walking from an indoor air conditioned environment into the very muggy out of doors. I don't change lenses in such an environment, and it's one reason I have two bodies with lenses firmly attached. In spite of these careful precautions I've still had to clean my sensors on occasion, but at least I could clean them. But I'm not so sure I want a camera that I can't easily service in the field. Logistics is as important an element to consider in any camera as any other feature, perhaps even more so. If it requires lots of trips to the depot to keep a camera working, that's a hidden expense I don't want to incur. Sending a camera in for periodic (yearly) maintenance is normal, or sending it in for a major problem such as physical damage. But getting junk on my mirror? No thanks.

Update 19 August

From a follow-on post from Kirk Tuck:
I grabbed a can of compressed air and a Sensor Brush (and followed the instructions sent by a reader of the blog). I blew the brush with the compressed air to remove dust on both sides. Apparently this also imparts a positive charge to the bristles that helps lift dust off. I did a wipe from top to bottom on one side (left/right, not back/front), flipped the brush over and then did the same to the adjacent half of the mirror.

Being fearful of destroying my mirror I shot test frames and blew them up on the monitor. Dust is gone and no ill effects followed on.


  1. Hey Bill. It's worth noting that Pentax are the only manufacturer I've used that allows you to physically clean the sensor without freaking out. They sell a sensor swab kit as noted in their manual. When I actually get so e time, I'm going to blog about the K-5. Stay tuned.

  2. Good post Bill, and valid points. And another one where in real world comparisons Olympus always came out first. They do not only have the sturdiest and best sealed bodies in their pro models - their sensor cleaning always led the field as well.

    Kirk is right, as always: a Nex should be considered superior in that regard. Just like those Pen cameras, which at least have in-body stabilization.


Post a Comment

All comments are checked. Comment SPAM will be blocked and deleted.

Popular posts from this blog

A Decade Long Religious Con Job

I rarely write inflammatory (what some might call trolling) titles to a post, but this building you see before you deserves it. I've been seeing this building next to I-4 just east of Altamonte/436 and Crane's Roost for nearly 12 years, and never knew who owned it. Today on a trip up to Lake Mary with my wife I saw it yet again. That's when I told her I wanted to stop by on the way back and poke around the property, and photograph any parts of it if I could.

What I discovered was this still unfinished eighteen story (I counted) white elephant, overgrown with weeds and yet still under slow-motion construction. It looks impressive with its exterior glass curtain walls, but that impression is quickly lost when you see the unfinished lower stories and look inside to the unfinished interior spaces.

A quick check via Google leads to an article written in 2010 by the Orlando Sentinel about the Majesty Tower. Based on what I read in the article it's owned by SuperChannel 55 WA…

Be Careful of Capital One Mailings

Capitol One ("What's in your wallet?") sent me a bit of deceptive snail mail today. I felt sure it was a credit card offer, and sure enough, it was. I open all credit card offers and shred them before putting them in the trash. Normally I just scan the front to make sure I don't miss anything; the Capital One offer made me stop for a moment and strike a bit of fear into my heart.

The letter's opening sentence read:
Our records as of December 30, 2009 indicate your Capital One Platinum MasterCard offer is currently valid and active.Not paying close attention during the first reading, I quickly developed this irrational worry that I was actually on the hook for something important, but I wasn't quite sure what. The letter listed "three ways to reply" at the bottom; via phone, the internet, and regular snail mail. I elected to call.

Once I reached the automated phone response system, the first entry offered was '1', to "activate my Capital …

cat-in-a-box channels greta garbo

So I'm sitting at my computer, when I start to notice a racket in back. I ignore it for a while until I hear a load "thump!", as if something had been dropped on the floor, followed by a lot of loud rattling. I turn around and see Lucy in the box just having a grand old time, rolling around and rattling that box a good one. I grab the GX1 and snap a few shots before she notices me and the camera, then leaps out and back into her chair (which used to be my chair before she decided it was her chair).

Just like caring for Katie my black Lab taught me about dogs, caring for Lucy is teaching me about cats. She finds me fascinating, as I do her. And she expresses great affection and love toward me without coaxing. I try to return the affection and love, but she is a cat, and she takes a bat at me on occasion, although I think that's just her being playful. She always has her claws in when she does that.

She sits next to me during the evening in her chair while I sit in mi…