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Topics - pato

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Underwater / Guide for buoyancy DYI for flashes
« on: December 31, 2014, 10:51:01 AM »
Hi all
I just found this nice guide about how to fix buoyancy for underwater imaging, which is often way off once a flash is attached: http://www.scuba007.com/camera-floats/index.html
I will try this for my flash :)

Technical Support / Canon 6D and old Sigma 400mm F5.6 overexposure
« on: May 28, 2014, 04:19:34 AM »
Hello all
I have an interesting problem with my Sigma 400mm APO HSR F5.6 lens and my 6D. I had this lens already with a Canon 550D where it performed lovely.
Now on the 6D (or after I used it in a very humid place), it always overexposures the pictures by 1 2/3 - 2 stops. The funny part is, the camera shows it's "correctly" exposed in normal and liveview mode, but the image is clearly much to bright. I could work around it by using AV/TV and underexpose all images by nearly 2 full stops. I didn't use the lens for some weeks and then used it again, but same results (in case it was really something with the humidity).
I don't anymore have my 550D, so I can't test if the lens is broken or if it's something special with the 6D.
What I wonder though, shouldn't it be the camera that is metering the light (based on histogram or whatever) and not the lens? If I check the picture after it's made (without compensation) it's clearly to bright in the histogram.
All other lenses that I have work fine.

I believe I once posted this question already, but I couldn't anymore find it.


Hi all

I found a very interesting blog post regarding autofocus (AFMA) and lightning conditions:
Here one picture which shows the autofocus result with a Canon EF 85mm f/1.2L

Also, it's just a few results and not yet a full range of many tests. But still, it shows a big variance depending on the used lightning when using autofocus, or doing AFMA.

What do you think of this?


Hello Swiss People :)

Sorry text now in German.

www.brack.ch bietet die EOS 6D mit dem 24-105 F4 und weiterem Zubehör aktuell für 2099 Fr. an!

•Adobe Lightroom 5
•Adobe Premiere Elements 11

Ist aktuell der beste Preis in der Schweiz!

For the American readers, that's around 2115 USD incl. tax for camera, lens, adobe kit and backbag!

Lenses / A used 100-400 f/4.5-5.6 L IS USM worth to buy for ~750 USD
« on: June 23, 2013, 07:31:45 AM »
Hi All
I might have an offer to buy a used Canon 100-400 f/4.5-5.6 L IS USM for around 750 USD. I don't yet have any usefull lens in that range, only the Sigma 400mm F5.6 APO Marco HSM which is not rechipped (and thus only with open aperture).
The lens has a little dust inside and the hood mounting mechanism is broken, but the seller says it's optically in otherwise perfect condition.

What do you think? Shall I rather way for the successor of this lens or get it? I'm not really in a hurry to buy it, but I think it's a really nice offer.

Underwater / Cheap underwater flash
« on: March 04, 2013, 09:34:17 AM »
Hi All
I own a Canon Ixus 960 IS with the fitting case WP-DC19. I search now for an inexpensive flash which I could use. One I saw is the Ikelite AF35 which might be useable.
It has to survive diving depths of 40 meters, should use rechargeable batteries and, most important, should work as a Slave which gets triggered by the built in flash.
Any recommendations?

Hello All
I am currently evaluating if I should upgrade my EOS 550D with a really nice 6D. The main reasons for this are:
- bigger body, but still not as big as the 550D with the battery kit mounted, thus it's better in hand
- bigger viewfinder
- MUCH better low light performance (probably the main reason)
- full frame sensor (a little bit more detail)
The main use of the camera is everyday pictures. I always carry my 550D with a Sigma 18-125 lens with me around and I like the range of this lens. I picture mostly animals, landscapes and buildings, but normally no people.
I compared the two lenses over at Dxomark, here the compare with the 5D MK2: http://www.dxomark.com/index.php/Lenses/Compare-Camera-Lenses/Compare-lenses/(lens1)/211/(brand)/Tamron/(camera1)/483/(lens2)/164/(brand2)/Canon/(camera2)/483
The canon is a bit sharper, but with "only" 1/3 of reach. I don't think I'll feel the difference of 24mm to 28mm at all with my shooting habits.
What do you think, should I take the better and sharper Canon lens, but loose quite a bit reach, or is the difference in sharpness anyway not visible if I'm not going to pixel peep?

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