Archives for February 2013

Downgrading AirPort Extreme to 7.6.1

February 11, 2013 by

I made a mistake last Thursday evening: upgraded my AirPort Extreme base station’s firmware to 7.6.3. Until Sunday afternoon WAN routing stopped three times (for which I first blamed our ISP), but when WiFi is also stopped last afternoon I decided to go back to the very well behaving 7.6.1.

But, to rephrase what Mr. Scott said: downgrading is easy, finding the file – that’s hard. Apple’s respective firmware page is an insult: it contains no link to the firmware update itself. Google turned up nothing, so I decided to go after a solution myself.

Note that I’m still using AirPort Utility 5.6. I consider 6.0 a huge step backward.

AirPort Utility stores the firmware files under the ~/Library/Application Support/Apple/AirPort/Firmware folder. You have a numbered subfolder for each model. My 4th generation AirPort Extreme’s number is 114. Here I found just one file: 7.6.3.basebinary.

So I knew that I had to look for 7.6.1.basebinary and put it into that folder. I also found a file named version.xml under the Firmware folder. Opening it quickly revealed that it contains actual download links for firmware images under the firmwareUpdates key (it’s actually an array of dictionaries, with each element corresponding to a firmware file). To find your file look for a dictionary containing your product number under the productID key, 7.6.1 under the version key, and you’ll get the download link in the location key, as you can see below:

<dict>
    <key>location</key>
    <string>http://apsu.apple.com/data/114/041-3395.20120130.Ka1Br/
        7.6.1.basebinary</string>
    <key>productID</key>
    <string>114</string>
    <key>version</key>
    <string>7.6.1</string>
    <key>sourceVersion</key>
    <string>76100.4</string>
    <key>sizeInBytes</key>
    <integer>6364116</integer>
</dict>

Also note that I had to download the firmware directly attaching the ADSL modem to my Mac, as at the end routing was so hectic that I was not able to do it via the AirPort Extreme. Having downloaded the file the actual downgrade procedure was seamless: put the file in the aforementioned folder and choose “Upload Firmware…” from the “Base Station” menu in AirPort Utility 5.6.

I also noticed a strange thing: while on 7.6.3 the Upload Firmware dialog only allowed me to upload 7.6.3 and nothing else. Now that I’m back on 7.6.1, it allows me to choose between 7.5.2, 7.6, 7.6.1 and 7.6.3.

All is well since then.

  ☕ ☕ ☕

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Filed Under: Computer Hardware Tagged With: , , ,

The Expendables: Canon 650D + 40/2.8 Pancake

February 3, 2013 by

I haven’t touched an APS-C Canon since 2006. After using a D60 for three years, I made its last image in 2005. I have been using full frame and APS-H since then. However, I bought a 350D in 2006, which I sold immediately after the first shoot – although image quality was good for the time, I really disliked everything else about the camera.

So why I have a 650D then? The answer is simple: we needed a cheap EOS for software testing. A camera that I won’t bemoan if we happen to kill its shutter after a year or so or amortize it any other way. The 500 EUR 650D seemed to fit the bill. And I bought a 40mm f/2.8 STM pancake lens with it – both for fun and for regular testing use.

Although I had no intention to use the camera for image making, I brought it to a Sunday walk last weekend. This post is about my impressions about both the camera and the lens.

The Camera

What touched me the most is the touch screen interface. It really helps to make an otherwise crippled and awkward physical interface usable. It really surprised me when I picked up a camera last fall how usable it is. Somehow I like it more than the 60D and the 6D. Touch controls are well implemented, but a dedicated graphics processor would help to make it iPhone-fluid. Some operations are low end Android-sluggish (like flipping through images and pinch zooming). It is self-explanatory and works quite intuitive. I only miss one feature: double-tap to switch between 100% and fit zoom levels. To tell you the truth I would love to see this touch interface on my 5D Mark III.

Frozen Forest

Image quality is not something to rave about: it is the usual contemporary, diffraction limited at f/7, but still usable up to 30×45 cm prints thing. Something I’m not really a fan of. But as I said, it’s still usable for making medium-sized prints.

I haven’t used a plastic camera body in years, and I can attest that magnesium alloy can be really cold in sub-zero environments. But I was able to carry the 650D around without a glove! It actually felt warm after hours of walking around in the winter forest. This was a positive surprise.

Another surprise was how it drives lenses. First I thought that something went wrong and the lens will fall apart… But I found these unusual noises to be normal with two copies of the model, as well as the 600D. I’m still in fear to put on my more expensive lenses.

Actually I quite like this small camera and will borrow it from testing for casual weekend walks. Who knows, it’s always good to have a camera with me.

The Lens

It is a gem. Small, light, inexpensive (at 150 EUR), and delivers great image quality. My first experience wasn’t so good, however. Just after picking it up right from the bag, the lens refused focusing. Some weird noise came from the AF mechanism, but no focusing. Removing and re-attaching the lens helped. Back at home I quickly checked the net about what the hell is going on here, and found that the lens needed a firmware update. Oh yeah, now you can upgrade lens firmware without bringing them to a Canon service center! This is good. But notice that you need a 650D, 5D3 or 1DX for this.

Wall at an Abandoned Rocket Base

Image quality is really good on the 650D, so I became interested in putting this small wonder on my 5D3 next time. Just to see whether its up to the quality of my favorite cheap prime trio.

The new stepping motor (STM) focusing is slow and noisy. Don’t expect something you used to with USM. But it seems accurate. Manual focusing is another story. I don’t like focus-by-wire lenses. Call me old school, but I prefer the physical connection between my hand and the focused distance. The focusing ring is also tiny, but the whole lens is tiny, so nobody can expect a huge ring here.

I will keep this lens in my bag most of the time. Weight is not an issue, and it delivers great images. Absolutely recommended for everyone.

Filed Under: My Photos, Photo Equipment Tagged With: , ,