Where did you get those numbers from?

F-stop 5.6
Focal Length 55mm
Subject Distance 1ft
near focus 11.89in
depth of field .21 inch
far focus 12.11in

Having looked at his picture, I'll say this. Not even dog wardens can get a dogs breed correct simply by looking at them. And these are people that deal with dogs day in, day out, all types and mixes.
My local shelter had a papillon dog that somebody was adopting and the staff had no idea what breed it was, some were guessing cocker spaniel mix, others were saying some sort of bichon or peekanies. I looked at the face, saw the ears and said I'll lay $100 on papillon. They laughed and said no that's to fancy to be it. Told them to pull the 3 inch thick book down off the shelf that all the standard dog breeds in it (I think it was the AKC guide) and look it up. Turns out I was right, but only because it is such a unique looking dog. Only reason I said it was because it was one of the few dog breeds that's difficult to get wrong.
When it comes to the bully breeds though, it's as easy to get them wrong as it was easy to get the butterfly ears right.
What I will tell you is, the 'pit bulls' you see now, aren't the same bulls you saw 10 years ago. Thanks in part to groups like the AKC and the CKC the breeds have been screwed beyond belief. The former being so closed minded that they will not title an APBT as an American Staff if it has been registered with any other agency as an APBT prior to attempting to register with them as an Am. Staff. Tell me how that makes sense. And the latter group allowing a dog to be registered with limited credentials based solely on the word of any three individuals testifying that the dog is what they say it is. Not three breeders of the dogs but any three people. Your elderly poodle loving grandmother, your mechanic that has never owned a dog, and the guy from down the road that thinks every dog with a black coat is a Lab.
I've digressed....yes I'd say it's probable, and possible that your dog has some of the old stock lines to him. Back when John Colby was bringing dogs into the country from Ireland and England, the lines that truely were used to work the cows, not fight them in a ring but run out in the field and grab hold of them so the farmer could come rope them and brand them. The 'bull dogs' from then had the longer legs, almost kind of gangly, they were muscular but a stocky muscle, a working muscle, the type of definitions that didn't interfere with their ability to trot and run and turn on a dime. What you see now being so low to the ground, and so overly muscular is a matter of individuals having the "bigger is badder and must be better" attitude. Granted most of those dogs have no problem latching onto something and holding it for hours at end, but they aren't able to run after that something for more then a few minutes before becoming winded to the point that they are already to tired to even hold it if they could catch it.
If you look at most of the taller, almost gangly looking dogs now you can say "Yup probably an old lines bully" and be pretty close. Not entirely certain though because I'll venture at some point an American Bulldog, or even a Boxer, was introduced into the lines to get back some of what had been lost over the years. Or as is the case of some rescues, the dog is called a Boxer, as a way to ovoid it being called a 'Pit' in an effort to get it adopted out. Case in point my dog sitting on the couch beside me. One of the first things I did was change his breed on his county tag registration from "boxer" to APBT / Boxer mix.
There are several "identify the breed of dogs" test out there where you have 10 or 15 dogs and have to find the 'pit bull' in the lot. Only thing is only 1 of the dogs is actually even a 'pit'. There are some Alpha Bluebloods, Boxers, Dogo Argentinians, American Bulldogs; both Johnson and Scoot type, and several other dogs that get lumped into the pit or bully type even when they aren't. Studies have found that even people that work with and know the breeds have problems correctly identifying them all the time.
So yes, I'll say it, it's highly probably your dog has the bull in him but I can't tell 100% for sure.
Don't go to much by the so called standards you find now. Especially the ones from the AKC for the Amstaffs. they are not following the original standards from ages ago. I can honestly say this because they will tell you the following "Size: Height and weight should be in proportion. A height of about 18 to 19 inches at shoulders for the male and 17 to 18 inches for the female is to be considered preferable." however this is simply them wanting to impart what they think it should be. And this is simply because the Amstaff is more of a show dog and not a working dog like the original APBT or bully dogs were.
The closest you can get to the old "Bull dogs" is the UKC standards. "As a general and approximate guideline only, the desirable height range for mature males is from 18 to 21 inches at the withers; for mature females it is from 17 to 20 inches at the withers. It is important to note that dogs over or under these weight and height ranges are not to be penalized unless they are disproportionately massive or rangy." Notice how they say a range, and desirable, with emphasis on allowing for variation? This is because back when the dogs were used for stock work and were true cow dogs, child baby sitters, they didn't earn the nickname the nanny dog for nothing, a dog could be a bit taller or shorter, heavier or looser and still be considered and used for breeding the APBT and the bulls in general.
Take for example the AKC, they will allow you to champion title a German Shepherd as young as 6 months of age! You can't even tell a GSD's true temperament until almost 18 months, and sometimes not until 24 months of age!
I could go on for some time about how various organizations have taken to what they "think" a dog standard should be, and have then screwed that standard up beyond belief do to their own politics. Instead I will borrow a phrase often found in serious working circles "form follows function" meaning the dog doesn't have to be pretty if being pretty means it can't work.
Now the really heart and potatoes of what I want to address.
DO NOT, I'll say again. DO NOT LET your dog drag you around on his walks. You are not doing him or yourself any justice. Even if he backs down from a fight, and honestly because of idiots, er people, over the years very few of the bull breeds will back down. They may not start a fight but because they have been poorly bred and by this I mean the willingness to fight when provoked, was to far instilled into many of the lines. If another dog starts a fight, and when things go to court, your dog can be villanfied in a heart beat based on 2 things. 1) It having the appearance of a 'pit' and 2) a fight. Regardless of your dog not starting the fight. I know that sounds stupid but it's true.
I had a German Shepherd from the time he was weened out of his litter till the day I had to put him down for chronic arthritis, and degenerative disk disease that crippled him and left him in pain every day. That dog was trained for bite work. And would protect on command. He would also disengage on command before ever engaging on the bite. He also wouldn't allow another dog to start a fight with him and would if I didn't interveen put a dog on it's back faster then the other dogs owners could drop their jaw. He wouldn't hurt the dog unless it was trying to give a full on fight in which case I'm sure he would have killed the other dog. However I never let it get that far because I could give one command of "aus" and he would walk away. This, and his willingness to follow commands off leash, despite somebody snapping a whip in front of him was enough to prove that he was without a doubt under control and would not start a fight no matter how much he was provoked into it short of defending himself.
Allowing your dog to just drag you around shows that you really aren't in control of the situation and can be used against you as having a "vicious beast". Trust me I don't agree with it, I think it's stupid, and I hate that it happens, but the reality of it is, it does happen.
Basic obedience is so easy to do it I can have 5 year old children doing it. Youtube is filled with videos like this and I trust those dogs with my life. It also goes a long way in showing that your dog is not aggressive despite it's breed make up.
How many times have bikers been called "hell raisers?" you know the typical tatoo having, old loud Harley riding guys with long beards. The same ones that are doctors and lawyers and work in the community for free volunteering their time to teach kids sports? Yea those! the ones that people avoid because of how they look only to find out they are gentle old souls? It's the same with dogs, it really is.
And it makes your walks so much easier. Dogs that don't have simple manners will pull and choke themselves simple on a "walk" which can cause damage to the wind pipe. Dogs that have been trained to walk gently beside their handlers often only need a "let's go" to stop a side course diversion to go sniff the neighbors cat.
Remember that disengaging before biting thing I talked about?
Dog sees a neighbors cat, wants to run over and play with it, and I mean honestly play, not try and kill. Dog yanks on the leash, leash breaks dog breaks out across a road, and BOOM gets hit and killed by a car because it wasn't trained to stop or not run off.
Now same dog, same situation, except for, dog sees cat, you accidentally drop the leash, dog wants to run off but takes two steps forward and gets a "NO! Down! Stay!", dog stops, hits the dirt in a down stay and doesn't budge till you pick up the leash and give him the "ok, good boy". Guess which dog is now still alive? Simply because he had some basic manors and a little bit of training. I know long winded example but it is because I want you to look at things a bit differently.
I don't mind you picking my brain and if you want to ask me questions go ahead. Probably best to do so in a private message or something so we don't end up further side tracking anybody's threads. I do the best I can to help because it's not about you or me it's about the dogs, we owe it to them to do what's right by them.

It's a rough translation.
I have had over 25 years of training dogs. I certified as a working dog decoy for a California Regional Police K-9 Evaluator, a Military Working Dog Decoy, I have helped police at state and local levels work dogs on both the west coast and the east cost. I've trained dogs for personal protection, scent discrimination, tracking, search and rescue, therapy work, and service work. I've trained for basic through advanced obedience with both hearing and deaf dogs. I've also done extensive research on the history and lineage of the German Shepherd and the American Pit Bull Terriers.

Abbreviate it. APBT.

He was an American Pit Bull Terrier, there's not such breed as Pit Bull Terrier.
You do find a lot of the Scott / Johnson crosses.
Also see a lot of the APBT / American Bulldog crosses as well.

Whistleblowers were already protected under federal law. But I'm glad to see that they are adding that into this law as another layer of protection.
It's been known for a long time that the reason that the VA had so many problems with care of the vets was because once a provider got into the system it almost took an act of congress to fire them. There is no real "malpractice" and regardless of how bad a doctor they were once in they were in. That's starting to change though. And this will help it along.
It wasn't until recently that a Vet could use a local ER if they lived more then 60 miles (I think that was the distance) away from a VA facility with an ER, without worrying about having a bill. Yes, sadly it used to be that if there was a vet had to have an ambulance called for them, and the closest ER was 10 miles away and a VA center was 40 miles away, the ambulance had to take the vet to the VA ER even though it was farther away. There were very few and far between exceptions for emergency situations and those were most often a stop at the local ER for stabilization and back on the road to the VA center.
Now thankfully as soon as the patient is wheeled into the ER the registration techs just need to be told the individual is a Veteran and they can start the paperwork rolling to get the VA to cover the cost of the local ER incident. This was something that was in the works prior to the troubles that happened recently but was pushed through because of them.
It means a lot to those of us that have to drive an hour or more just to go to a VA center when we have equal or better non-VA facilities only 20 minutes from our homes.
I know I was able to get my physical therapy waived to where I only had to make 1 trip to my VA facility. Although my spinal injections had to be done at their pain management facility even though I have a brain and spine injury facility here locally. Now hopefully if I need to ever have another nerve block done I can get it approved for here locally rather then the leg numbing hour long ride.
As much as I know the POTUS would love to claim he was behind this legislation, don't be fooled he wasn't. This was the actions of a couple good members of the House and Senate that were sick and tired of seeing vets get shoved around and crapped on. Had the POTUS not have signed it, I'm pretty sure Congress would have over rode him and put it into law anyways.

Petey was, despite what Wikipedia says, more of an American Pit Bull Terrier. Rather then the American Staffordshire Terrier. These are, despite what the AKC will claim. Two different breeds. Very similar but different. (Try registering a dog that has a registration as an APBT with the UKC as an AMSTAF with the AKC and let me know how that works out for you.)
The reason so many people think Petey looks like the dog you have is because Petey had more of the stock dog look that the Scott Type American Bulldog has.

There is actually a way to download the software without having to fork over your email information first.
The software is housed on sourceforge I believe. I did have it at one time and found it not only limited in what it could do because they were starting it over from the original version, but I sent an email to the developers asking why they were attempting to control who downloaded the program by insisting that people give up their personal information prior to providing a download link? I've never had any other open source software group pull that kind of crap. Their response was snotty, arrogant and smacked of a "either you give us your info to do with what we want or go find something else because we are high and mighty". They claimed it was to control quality so they could monitor how many downloads and who was accessing the software and modifying it / releasing it. I called bull shite since it was open source, anybody has access to the code and can in turn release a new version and provide the code changes back to the public. They were dancing on trashing the GPL with their crap. I was almost tempted to tell them that I would NOT provide my information (name, email, etc) and wanted the source code as is required under the GPL but after a not so nice "go shove it up your..." response I said the hell with them.
Needless to say the software got yanked off my system faster then the hard drive knew what to do with it.
I used darktable on my Linux machine after that. I still have it on my macbook pro and from time to time check to see how the feature set is coming along.
It's pretty close to Lightroom, not exact but it's getting there in it's features of what it can do.

Wait until that 9 and 12 year old meats up with their 18 and 19 year old cousins in the states and decides they want to jump into a gang.
Sorry but anybody with a gun in their hand and pointing it at you, regardless of their age, is no longer the sweet and innocent little child you want to believe them to be. They are a threat to your safety and well being.
And before anybody starts crying "Oh but they don't know better, we just have to save them...." Yes, they do know better. They know the life they are choosing, they see it constantly, and plenty of them decided at a young age they don't want to live that life.

Simple way to solve that. Do not extradite them, do not deport them. Execute them. Since they are not legal US Citizens, and because we have a war on drugs AND a war on terror, they could be classified as enemy combatants. Which means no need for a civilian trial. A military tribunal can find them guilty of war crimes, and rather then spending the money housing and feeding them in Levonworth or another federal prison, simply execute them.
Once is a mistake, twice is not learning their lesson, but being caught and released multiple times (aka deported) well this isn't fishing...

Good shot, would have been amazing if the light had light the nose and muzzle as well. Sometimes nature only co-operates so far though.
Good timing!

In general the Kurds were decent to us and appreciated us being there.
I also did a tour in Iraq before we left the country. We were the last group of Engineers to go in. After us nobody else was rotating in the country. I was stationed in Mosul which is in the north western area, but we traveled all over MND North area, including Erbil which is in the Kurd area.
The only thing I didn't like about that was we had to go over to their base to eat our meals, and they found it "offensive" if we carried our weapons in the dinning facility. Their train of thought was they were there to protect us, and that we didn't need to carry our weapons, doing so showed that we didn't trust them to take care of us as their guest there.
I politely informed both my Platoon Sargent and my Platoon Lieutenant that I didn't trust anybody not wearing a US, British, Australian, etc. uniform. There had been to many instances of "friendly fire" from so called "Iraqi Military" or "Iraqi Police" individuals that were actually terrorist that had infiltrated their forces. I would leave my rifle locked in the vehicles (YOU try breaking into a locked up armored M-RAP) but I carried my pistol on my hip or in my shoulder holsters along with all 3 magazines of ammo for it.
I had the theory that if any of the Kurdish personnel became offended I would simply explain that it wasn't that I didn't trust them it was that I was prepared to fight along side them and didn't want to have to run back and get my rifle out of the truck.
Thankfully I never had to explain it although I did get a few odd looks from a few of them, but that was probably because I was petting the "stray" dogs that hung around the compound.
Oddly enough one of Kurdish Kangel dogs started growling at the Iraqi troops while I was petting him and he didn't stop until they walked past us. Looks like he trusted them less then I did.

Is the Sigma capable of being used on the 6D as well?

A common mistake is to not use a lower case letter instead of an upper case one for the first word of a sentence.
Canadian Geese refers to multiple geese whereas Canada Goose refers to a single goose. Technically they are Branta canadensis and yes that second word of the Latin name is supposed to be lower case. If I were to use the Latin term not many people would have known what I was talking about despite the picture, so I used the common vernacular for the name instead.
While we are at it, it is They not THey. Beautiful not Beutiful. There is a space after a period before starting a new sentence. So ... feed.Drives ... should actually be ... feed. Drives ... It is simple not simgle. Circle not circlle. Field not fileld. Basically if you are going to correct somebody else on their mistakes, make sure your own house is in order first.

The second and third ones crack me up.