November 28, 2014, 09:49:36 AM

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Messages - DominoDude

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1
Lenses / Re: Bokeh: Good vs. Bad?
« on: November 27, 2014, 11:26:26 PM »
To me, good bokeh is a smooth smear of colours and structures in the OOF objects without much introduction of wonky artefacts from the lens. Clearly onion-shaped bokeh is not high on my list, neither is the effects seen from the EF 50/1.8 with its 5 aperture blades. Bokeh from mirror reflex lenses are also prone to looking bad in my eyes.

A rating of various lenses bokehliciousness can be found here -> http://www.stevehuffphoto.com/2010/02/11/what-is-bokeh/

First photo's taken with my old Sigma 50/1.4 EX DG HSM @ f/1.4. I'm not too fond of the bokeh in that shot.
Second - same lens but @ f/1.6. Here I like how the background turned out.
Third - the Yellow Cowslips are taken with the EF 400/5.6 @ f/5.6 - I loved the bokeh that lens gave me. (Not so good bokeh anymore after I dropped it in June...)

2
EOS Bodies - For Stills / Re: 7DMKII Focus keeper rate ideas?
« on: November 27, 2014, 05:24:31 PM »
To answer the question about how much is 1 unit on the AFMA scale: It is 1/8th of the current lens DoF at its widest aperture.

Edit: Adding source to the above. Rudy W @ Canon, as described in this article -> http://www.learn.usa.canon.com/resources/articles/2011/af_microadjustment_article.shtml

Actually, Rudy Winston is incorrect.  It's not 1/8th the depth of field, but 1/8th the depth of focus.  The latter is the sensor-side equivalent of DoF, measured in microns.  DoF changes with subject distance, depth of focus is relatively unaffected by subject distance.  That distinction means the magnitude of the DoF shift for a given AFMA value changes with subject distance, which is the basis for the recommendation to calibrate at 25-50x the focal length unless you're consistently using the lens at a closer distance.

Ok, good clarification!
I'm not the one to go against Rudy, or you for that matter, on this subject.

3
EOS Bodies - For Stills / Re: 7DMKII Focus keeper rate ideas?
« on: November 27, 2014, 05:14:05 PM »
Hi Domino Dude.
I was aware of that, what I was referring to was how many 0.001mm manufacturing errors cause 1 AFMA unit of correction to be needed.

Cheers, Graham.


To answer the question about how much is 1 unit on the AFMA scale: It is 1/8th of the current lens DoF at its widest aperture.

Edit: Adding source to the above. Rudy W @ Canon, as described in this article -> http://www.learn.usa.canon.com/resources/articles/2011/af_microadjustment_article.shtml

Yupp, I didn't doubt that, Graham. In order to keep it together I quoted you so the information came in a proper context.

4
Photography Technique / Re: Share 3x your own advice to yourself!
« on: November 27, 2014, 11:57:22 AM »
The earliest piece of advice that I received from my father doesn't really apply to my current camera but could apply to mirrorless and some other cameras.

He went to Super Bowl V (back in 1970, I believe) and brought his Minolta camera. As he was walking along, he spotted Muhammad Ali walking towards him. He asked if he could take his picture, to which Ali happily obliged. When he later showed the slides to our family, he said that he would never make the mistake that he made on that photo again - from now on, he would make sure that the the lens cap was off the lens before taking photos  :'(. He always left that lovely pitch-black slide in the carousel, just to remember the moment.

Somewhere in a box I have a photo of Muhammad Ali that I took in the late 70's. Very Instamatic-y, but he made sure I got the best possible shot I could get, by shoving the photojournalists aside. That man had some serious reach when he stretched out his arms to the sides.

5
EOS Bodies - For Stills / Re: 7DMKII Focus keeper rate ideas?
« on: November 27, 2014, 11:44:11 AM »
I just showed this thread to a psychologist who's used to working with obstinate and "damaged" children; she almost wet herself and asked to borrow the bathroom. I don't know if it was from laughter, or if she got a glimpse of future revenues...

6
EOS Bodies - For Stills / Re: 7DMKII Focus keeper rate ideas?
« on: November 27, 2014, 10:20:56 AM »
To answer the question about how much is 1 unit on the AFMA scale: It is 1/8th of the current lens DoF at its widest aperture.

Edit: Adding source to the above. Rudy W @ Canon, as described in this article -> http://www.learn.usa.canon.com/resources/articles/2011/af_microadjustment_article.shtml

7
EOS Bodies / Re: Patent: Contact Cleaning Body Cap
« on: November 27, 2014, 09:43:45 AM »
...
 
We had one prolific inventor who wanted to patent a self soldering pin.  A electric heater would be built into the assembly which would melt the solder and create a solid soldered connection after you let it cool.  It would be heated again to disconnect it.  I refused to recommend it for a patent for numerous reasons, but this only caused him to write letters to managers saying how we were not receptive to his good ideas.  I didn't think soldering on a fueled space craft, rocket, or aircraft was all that smart, it was prohibited, in fact.

(Short detour from topic) Huh! *shrugs* I wouldn't trust soldering at all in things that might be subject to such high G's. In the days when I was involved in similar we used wire wrapping techniques and filled up all cavities afterwards with hardening foam. Things stayed in place that way, but maintenance was a bitch on such boards...

8
Photography Technique / Re: Share 3x your own advice to yourself!
« on: November 27, 2014, 09:10:03 AM »
    • Take care of your negatives / Shoot RAW! Have plenty of backups.
    • Get good enough gear, and do not wait for perfect gear.
    • Don't be afraid to ignore/bend and go against all rules except #1
(4) For gods sake: Shoot! If you never pull the trigger, no one will know if you're good or have something to tell.

9
Animal Kingdom / Re: BIRD IN FLIGHT ONLY -- share your BIF photos here
« on: November 27, 2014, 08:30:14 AM »
Hi GraFax.
Very nice shot, well done.
I wonder how the aircraft engineer/designer first came up with the idea of wing fences!  ::)

Cheers, Graham.

Here's a nice look at the wing profile in flight. For those interested in fluid dynamics and such....

From what I've been told, winglets / wing fences started as an idea from people observing eagles and how some of them tend to spread their "fingers" when they glide.
The lift you want from a wing is close to non-existent at the outermost part of the wing, and instead you have a lot of vortexes forming that actually lower the lifting capacity. The winglets counter the creation of vortexes.

10
Landscape / Re: Seashore, Beaches and Harbours
« on: November 26, 2014, 09:11:01 PM »
1. Coast guard building in Victoria, British Columbia.
2. Halifax harbour in the early evening.

I especially like the 1st one. Subtle colouring on that.

11
Lenses / Re: Review: Sigma 50mm f/1.4 ART for Canon
« on: November 26, 2014, 09:51:52 AM »
Well done, Dustin!
A balanced and unbiased review that should be very useful for potential buyers of a standard prime.

12
Software & Accessories / Re: What accessories for 7d Mkii?
« on: November 26, 2014, 09:05:47 AM »
... Whats an 'L' bracket by the way?

Ashley
http://ashleymiddleton.zenfolio.com

The rest of the text below can be read at http://www.the-digital-picture.com/Reviews/Camera-L-Plate-Review.aspx
Quote
The primary use I have for L-brackets is to quickly, securely and solidly attach a camera or big lens to a tripod or monopod head that has an Arca-Swiss-compatible quick release clamp. And the primary advantage an L-bracket has over a normal camera body plate is that there are two mounting plates - which allows the camera to be attached in landscape or portrait orientation with similar ease.

This versatility avoids the need to use the drop-notch on a ball head (which significantly lowers the viewfinder eye level - especially for cameras with a battery grip) for portrait/vertical-oriented shots. The drop notch then remains available for more framing flexibililty - allowing far-beyond vertical framing even with a level tripod.

Various brackets (such as flash brackets, panorama brackets, other mounts ...) can be attached to the L-brackets. Clamps can be purchased individually and mounted to almost anything your creativity dreams up - allowing your camera to attach to the same.
...

13
Landscape / Re: Mountains, Lakes and Rivers
« on: November 25, 2014, 08:59:43 PM »
Midnight, Walker lake, Brooks Range, Alaska.

Charlie... the plane

I honestly don't know what to say, but: Wow!

14
EOS Bodies / Re: Another 50mp FF DSLR Mention [CR2]
« on: November 25, 2014, 01:57:06 PM »
Not pointing in any special direction, and I could have posted this in quite a few threads here today: But somehow I can imagine early on in the weeks that there are individuals who have had sex offerings turned down during the weekend - by both of their hands...

Don't take it out on the forums! Be civil.

And now back to the normal yada yada "You're wrong, I'm right!"

15
Lenses / Re: Review: Canon EOS 7D Mark II by Fro
« on: November 25, 2014, 01:19:30 PM »
I have had some minor doubts about the battery life, and the feedback I got earlier on was of the diplomatic kind from a journalist. It still looks as though the batteries won't last just as long as they did on the 7D Mark I.


For some reason the battery life of mine has steadily improved. Not sure why. I was trying to kill the battery yesterday using GPS and a lot of live view and it seemed fine to me. Can't say how it compares to the 7D. He was complaining about only being able to shoot 1000 Raw + JPG with a single battery. He must shoot a pro body because I don't think that's unreasonable for one of those LP-E6's.
*nods* I bet some can be done by tweaking ones own settings and to chimp a little less. (As you get used to a camera, you will find smarter ways to accomplish things and that should also lead to increased battery life.) I also believe that a few tweaks of the firmware can increase the battery life to some degree, and deal with a few other issues yet to be discovered - bad coding can waste CPU cycles and wreck even the best intentions.

A tad shorter battery life could be a benefit to both Canon and users; Canon will sell more batteries, and users are more likely to buy that backup battery they otherwise wouldn't consider. Most of the time they won't need to change to that spare, but it won't hurt to carry it with you, and it would ensure you could go on for just a while longer if push comes to shove.

I shoot with a 5D3 and get like 1200-1400 pics, with basically very little screen usage during a wedding. I donĀ“t have lenses with IS that might require extra energy. But 669/0,75=892 which seems lame.

Oui, I shoot with 7D Mark I and get over 1000 on that, if I don't have Magic Lantern activated. I don't have the need to chimp any longer (well, mostly) and I can have the camera on for a week and go out to shoot on several occasions without bothering about if it's sufficiently charged.
I believe that Jason was in a different position with a slightly unfamiliar camera and that had an effect on the drain rate. But I still think that the 7D Mark II will get less shots on one fully loaded battery compared to the Mark I.

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