December 22, 2014, 10:53:13 PM

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Topics - Don Haines

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1
EOS Bodies - For Stills / Reikan Focal VS Dot Tune to AFMA lenses on a 7D2
« on: December 21, 2014, 01:19:42 PM »
I have heard claims that "Dot Tune" was a reliable method to AFMA a lens. I have also heard claims to the contrary. Most of those claims have been long on opinion and short on data, so I decided to give it a try myself on a 7D2.

The results are as follows: (under incandescent lighting)

150-600: dot tune (150 +9) (600 +14) - Reikan   (150 +5) (600    +6)
  70-200: dot tune ( 70 +7) (200   +4) - Reikan   (  70 +2) (200    +3)
  17-55 : dot tune (  17 +4) ( 55    +3) - Reikan   (  17 +5) (  55   +9)
   10-20: dot tune (  10 +4) ( 20    +9) - Reikan   (  10 +5) (  20 +17)
      100: dot tune (100  -8) - Reikan  (100 +5)
       30 : dot tune (  30  -2) - Reikan  ( 30 +1)

I changed locations, repeated the test and got the following: (under flourescent lighting)
150-600: dot tune (150 +11) (600 +17) - Reikan   (150 +5) (600    +6)
  70-200: dot tune ( 70   +7) (200   +5) - Reikan   (  70 +2) (200    +3)
  17-55 : dot tune (  17   +4) ( 55    +3) - Reikan   (  17 +5) (  55   +9)
   10-20: dot tune (  10   +3) ( 20    +7) - Reikan   (  10 +5) (  20 +17)
      100: dot tune (100   -10) - Reikan  (100 +5)
       30 : dot tune (  30   +1) - Reikan  ( 30 +1)

The observations are:
1) The Reikan values stayed the same between the runs
2) The Dot Tune values varied up to 3 units between runs
3) Reikan and Dot Tune only agreed once.
4) Reikan and Dot Tune can disagree by up to 15 AFMA units

If you look at the discrepancies under the two runs.
incandescent - 4,  8,5,1,1,6,1,  8,13,3
fluorescent    - 6,11,5,2,1,6,2,10,15,0

it appears that Dot Tune is affected by fluorescent lighting.

A quick visual verification of the extreme cases indicates that the Reikan values are far more accurate that the Dot Tune values.

My conclusion. At least on a 7D2, don't waste your time using Dot Tune on your lenses, get Focal and do it right.


2
Technical Support / failing shutter on 60D
« on: October 26, 2014, 08:52:48 PM »
I have a 60D with about 100,000 actuations on the shutter. Everything still works, but there appears to be no difference in exposure from 1/500 of a second to 1/8000 of a second. It opens and closes, slower shutter speeds seem OK, but fast seems to be stuck around 1/500.

The camera has never been cleaned or lubed... I was wondering if the problem could be solved with a proper cleaning. From everything I have read, when a shutter fails, it just stops... so I am wondering if clean and lube is the solution.

And NO, I am not going to spray WD40 or something like that into the camera :) so please don't tell me not to. I am considering sending it back to Canon for a proper cleaning and tune up... I want to keep it as a "magic lantern" camera...

3
EOS Bodies - For Stills / Posting about sensors and DR!
« on: September 23, 2014, 05:53:35 PM »
The title says it all.... after thread after thread becomes arguments that never end, what do you wish people would do?

4
Landscape / Fall colours
« on: September 22, 2014, 06:44:21 PM »
Fall is coming! Show us the colours!

To start us off, some tamaracks... a coniferous tree that changes colours and drops it's needles in the fall.

5
PowerShot / SX-60 coming at Photokina!
« on: September 12, 2014, 11:35:53 AM »
The latest rumour is that the SX-60 is coming to photokina.

The SX-50 works surprisingly well.... but what changes will come on the SX-60? A larger zoom range is a given... I have heard rumours of 60X and 100X... but does anyone know what the specs are supposed to be?

DPAF would be a killer addition, but I doubt we will see it. Wifi? Megapixels? anything?????

6
Software & Accessories / Portable HD with SD reader
« on: September 04, 2014, 05:14:39 PM »
Thought this might interest a few people....

a 2TB hard drive that runs off batteries with an integrated SD card reader....

http://www.wdc.com/en/products/products.aspx?id=1330

7
EOS Bodies / Are you planning to purchase a 7D2
« on: August 27, 2014, 10:24:52 AM »
With all the hype on the forum about the 7D2, the question is asked.... "Are you going to get one"?

Who is serious about the camera and who is just kicking tires or wondering about Canon's possible plans for the future?

8
Site Information / Nikon adds on CR
« on: July 07, 2014, 12:26:53 PM »
I have started to see adds for Nikon on my CR feed!

Inconceivable!
Oh the humanity!

9
Abstract / This image may have been photoshopped
« on: May 15, 2014, 11:09:23 PM »
While we wait for the next rumour of the 7D2, 5D4, speedlight700, or the 400F5.6II.... let's have some fun. Post some images that may have been photoshopped... I'll lead off with Godzilla's kitty....

10
EOS Bodies / 70D manufacturing delays
« on: April 14, 2014, 05:30:05 PM »
Copied this from PetaPixel...
Released back in September of 2009, the Canon 7D is long overdue for a much-anticipated refresh. The problem is, up until just recently various sources have published conflicting reports that seem to get us no closer to knowing what this camera will actually look like.

However, yesterday, Northlight Images reported some interesting news that seems to make sense and go along with some of the more plausible rumors about the impending camera.

The Northlight Images report claims that the Canon 7D Mark II will feature a higher end version of the dual pixel sensor Canon used in the 70D. A slightly less powerful version of the tech is also rumored to appear in the 700D (Rebel T5i) and 100D (Rebel SL1) replacements.

However, it seems some manufacturing issues with the dual pixel design of the 70D sensor has delayed production of the 7D Mark II and other successors, forcing Canon to push back release dates until late summer or possibly even early fall.

canon7d_mini

Beyond the new sensor technology in the camera, the below specs are just some of what has been rumored to make an appearance in the 7D successor, although there are a few conflicting reports:
•20MP APS-C Sensor
•ISO 100-12800 (expandable to 25600)
•1/8000 – 30s, Bulb, X=1/250
•150,000 shutter life
•Silent shutter mode, similar to 5DMIII
•19-point phase autofocus
•8fps
•15 Raw / 126 JPEG Buffer
•3.0″ 1040k LCD, touch screen
•Optional WiFi
•Magnesium Alloy body
•Battery capacity 850 shots
•148.2 x 110.7 x 73.5 mm
•Weight 910g

Ultimately, much of this is up in the air still, with nothing considered confirmed until Canon decides to make an announcement itself, but the rumored specs seem to be fairly logical considering what Canon has put out in the past

11
Landscape / Springtime in Canada
« on: March 20, 2014, 12:08:48 PM »
Hey fellow Canadians! Grab your snowshoes and put on your parkas and let's go out and show the world what the first day of spring 2014 is like in Canada... When you post, be sure to say what part of the country you took the pictures in.

12
Landscape / Algonquin Park, Canada
« on: January 25, 2014, 01:27:12 PM »
I spend a lot of time here in the spring, summer, and fall. This is canoeing and camping paradise... What's your favourite photos of the park?

Otterslide Creek
Cedar Lake
Grand Lake
Barron River panorama

13
EOS Bodies / 6D clearance sale
« on: January 03, 2014, 03:40:45 PM »
The Henry's camera chain in Canada is having a clearance sale and the 6D is listed......

Strangely enough, neither the 60D or the 7D are listed as clearance items...

Gentlemen, start the rumour-mongering :)

14
Lenses / Best Teleconverter
« on: December 30, 2013, 05:17:01 PM »
A friend asked me which one is the best teleconverter and if there is much difference between them. I had to admit that I didn't have a clue... Is there a comparison anywhere of the more popular ones? Canon III, Canon II, Kenco, Sigma, Tamron ?????

15
Lenses / teleconverters and resolving power
« on: December 19, 2013, 10:48:45 PM »
What does a teleconverter do for you if you wish to resolve fine details on a distant object?

The point that I am trying to make is that unless you have a really sharp lens, you are better without teleconverters.

My past experience is that using a crop body,  if you have an ultra-sharp lens (like the series 2 big whites) a teleconverter will improve your resolving power, if you have a sharp lens (quality of 70-200F4) it is neutral, and if you have a soft lens it will hurt you.

The test is to capture photos of a small bird from 25 feet away. Since I can not get a bird to pose for me as I change lenses, I substituted a bird sized stuffed animal. All shots were cropped to the same portion of the bird's head and all images resampled to 500 pixels wide. unfortunately, I do not have a "big white" at home so that part of the test is left out... so the sharp lens used is a 70-200F4 and the soft lens is a Sigma 120-400F5.6. To make things interesting, a SX50 was thrown in as well.

The first pair of pictures is the SX50 at 50X zoom and then at 200X zoom (digital zoom enabled).
The second trio of pictures is of the 70-200 at 200mm, with a 1.4X teleconverter, and then with a 2X teleconverter. The third trio of pictures is of the 120-400 at 400mm, with a 1.4X teleconverter, and then with a 2X teleconverter.

In the first set, we find the image with digital zoom turned on is better than without. This came as a surprise to me as I had always assumed that digital zoom was an evil to be avoided......

In the second set, we see that the addition of the 1.4X teleconverter makes the image slightly better and that the 2X teleconverter makes things worse.

In the third set the teleconverters just degrade the images.

Something particularly important here is that a sharp 200mm lens provides more detail of that distant object than the soft 400mm lens.... but the most shocking conclusion is that a p/s camera (the SX50) can out-resolve both.

The last picture is the SX50 at 200X on the left and the 70-200 at 200mm on the right....

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