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Messages - garyknrd

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31
Lenses / Re: Patent: Canon EF 300-600 f/5.6 w/1.4x TC
« on: December 14, 2013, 12:16:40 PM »
Good points. 

 Looking at the MTF charts for my two Canon lenses it follows what you say to a tee.  I have to agree also with what I have found with my two lenses.
The bare lens is reet. Beautiful flat field wide open. Stopped down with a 1.4 T.C = a flat field, and a sharp enough image. For me the 2.0x is a no fly zone.

My two Canon lenses perform so good with out a t.c. I don't worry about my settings other than correct exposure. All the pressure is off. And I just enjoy the hobby.

Great thread.






32
Lenses / Re: Patent: Canon EF 300-600 f/5.6 w/1.4x TC
« on: December 14, 2013, 02:50:17 AM »
The wide aperture affects AF speed and AF point precision and capability. Remember, particularly in the 61pt AF system, there are f/2.8 double cross type points, f/4 cross type points, f/5.6 line points, and the center expansion f/8 points. With an f/4 lens, you ALWAYS AF at f/4, no matter what you stop down to for actual shooting. The extra stop of light allows the AF system to operate more quickly and more accurately. When f/4 AF points are used, they tend to be more precise than f/5.6 points, which need larger pixels in order to sense as well as f/4 pixels.

The point of an f/4 lens isn't that you always shoot wide open (although in the evening, it isn't uncommon...I tend to be around f/8 aperture for shooting during daytime, and f/4-5.6 for shooting around sunset, for wildlife.) It's that you ALWAYS AF wide open (by design.) And yes, with an f/4 lens, when you slap on a 1.4x TC, you still AF at f/5.6, which is still better than AF at f/8, no question.

Jrista, thank you.
I actually completely forgot about the difference between f4 AF points and f5.6 ones. The high precision f2.8 AF points are referenced so much I guess I clumped all the others into the same group. (After reading multiple articles detailing all the AF points, and watching the entire B&H Canon AF seminar [ ww.youtube.com/watch?v=iAx86nblZ2g ][great video BTW], you would think that someone would remember something like that. I guess a guy can only fill his head with so much.)
That changes my perception of the TCs quite a bit. I've been assuming that you get "worse AF" when using a TC because of a combination of optical performance and some kind of interference in the circuitry, if on the other hand it's actually just due to the change in the type of AF points used, then the 600f4+1.4xTC is actually going to AF exactly the same as the 800f5.6. I was assuming the latter would have an advantage.
Indeed that does make a very good case for the 600f4, and makes the 300f2.8 more appealing now that I know it's not some mystical interference from the teleconverter making AF worse at 600mm.

IMO a  teleconverter, no mater how good it is ( and how sharp the lens is ) degrades the image. And that also has an effect on AF accuracy and speed. As well as the loss of 1 or two stops of light.
I would love to see a auto-focus test using the 600 II with a 1.4 against the bare 800 F/5.6 lens. With the same camera it is my guess! The 800 would win. Not only being faster ( though very slightly ) but more important more accurate. Looking at the MTF charts of the two lenses it would be a very close race for sure.   

Look at this link 1.4 tc III on the 200 f/2.8 lens. http://slrgear.com/reviews/showproduct.php/product/1367/cat/62

And here for the 2.0tc III:  http://slrgear.com/reviews/showproduct.php/product/1366/cat/62

Looking at that data. Pretty much clears things up for me when using a t.c. I wish these guys would test the 600 II and 500 II using T.C.'s.

But even if that is true. I would much rather have a 600 II with a teleconverter any day...   ;D


33
Lenses / Re: Patent: Canon EF 300-600 f/5.6 w/1.4x TC
« on: December 13, 2013, 11:20:37 AM »
Bingo.. I was wondering when someone was going to mention this. When shooting in good light I sometimes use a 1.4.
 
Most of my shooting is in dismal light. Making T.C. work miserable for me.

I was in a hide shooting pittas about two months ago. With my F/2.8, 300mm using the 2.8 focus points of  the Mark IV. I was running circles around the other photographers. There was no comparison. I ended up with the best shots by far in a few minutes. Where most hard core birders had been there for days.

Moving from F/2.8 to F/4.0. Makes a noticeable difference in AF performance. Simple things like this will get the shots others will not. I have run circles around guys shooting 500 + 600 mm F/4.0 lenses in very poor light. Many ask me why aren't you using your 500?  I just smile and start shooting the eyes out of the birds. While they are having to move back and suffer the handicapped AF performance of F/4.0.

It is the main reason I own a 300 2.8 lens.  Over here the guys that run down the 300 2.8 saying it is to short. Loose big time in low light close quarter shooting which is common in the jungle.

I am looking forward to the next generation of cameras. I skipped the IDx. But would love to try one just to play with the AF.

Great hobby. Just a lot of fun...

www.flickr.com/photos/avianphotos
www.birdsthatfart.com




34
Lenses / Re: Patent: Canon EF 300-600 f/5.6 w/1.4x TC
« on: December 12, 2013, 11:07:23 PM »
My main problem with a 2x is camera or lens shake. Even on a very stable tripod, locked down. It is tough. I have used a bean bag with a little more success. I admire you guys. Way out of my league.

35
Lenses / Re: Patent: Canon EF 300-600 f/5.6 w/1.4x TC
« on: December 11, 2013, 09:07:46 PM »
The point was that it's possible to shoot BIF handheld with the 600 II + 2xIII.  Hit rate was ~50%, due to the difficulty of keeping the center + 4 AF points on the bird, but it can be done.

The bittern shot is cropped by about a third,...it was a gray, ugly day at the end of October, 2012.  This shot from 40 minutes later that day (also with the 600 II + 2xIII) shows the rain that started falling on us, being blown nearly sideways by the strong winds…it was the outskirts of Hurricane Sandy.
I agree that it is possible, but AF is too limited. Keeper rate is low and 1200mm is difficult on anything that moves, regardless of AF functionality.

You guys must not pay much attention to professional bird photographers. Many of them use the 600II + 2xTC III. Some of them rarely ever use anything else! Most of them used the 800/5.6 before, many never removed their 1.4x TC's from it. One of the primary reasons professional bird photographers buy 1D series is for the f/8 AF, because they use it CONSTANTLY.

Keep in mind, the 1D officially supports f/8 AF. It isn't like the makeshift f/8 AF you can get with a Kenko slapped onto a 400mm f/5.6 on a 7D, where your luck is basically a roll of the dice, and AF performance is excruciating. Nor is it even like the 5D III, which supports f/8 AF, but isn't as fast as the 1D series. I am guessing, at best, most of you calling f/8 AF slow have only used the 5D III. Try rending a 1D IV sometime, or if you know a friend with one, see if you can borrow it. When it is officially supported, especially these days with support for expansion mode (where a total of five central AF points are used in the 1D X/5D III), it is fast, accurate, and very usable.

Now, granted, f/8 lenses aren't ideal for tracking birds in flight. Usually, if a bird is flying towards you or angled across your field of view, f/8 lenses, which are usually over 800mm in length, are just too long...you need something wider anyway to compose properly and leave a little room for some of that necessary cropping and straitening. So it isn't like anyone expects f/8 AF to be used to track one of the most complex and difficult subjects that you can track. That's the reason f/4 supertelephotos exist...LOT of light, FAST af...you track BIF with a 500mm or 600mm f/4. The f/8 is most frequently used for perching birds, shorebirds, waders like herons, waterfowl, distant wildlife, etc. where you don't have to bother tracking...you just point, focus, and shoot. Both the 5D III and 1D X are MORE than capable of doing that with an f/8 lens.

I've tried a 2X a few times. And I see the pro's using it.
It drives me to drink. I finally just gave up. LOL
I cannot get the hang of it. I am 2x challenged for sure.

36
Lenses / Re: Patent: Canon EF 300-600 f/5.6 w/1.4x TC
« on: December 06, 2013, 08:35:32 PM »
I wonder if Canon would decide to not develop an 800mm f/5.6 IS II and instead just release a 600 f/4 IS with 1.4TC instead??  Already the 600II with external 1.4 TC has equal IQ and AF to the 800 IS I.  So a built in TC that could be even better optically paired to the lens may make a 800 II a useless proposition.

Not sure about that one. But I bet they would sell a lot more of the 600 + 1.4 T.C..   I would love that lens. Here is hoping the stock market holds and someone else is not chewing my food for me before it is avaliable..  :P

www.flickr.com/photos/avianphotos
www.birdsthatfart.com

37
Lenses / Re: Handheld vs. tripod with the Great Whites
« on: November 22, 2013, 02:25:01 AM »
According to a majority of white lens owners here in Japan, you apparently cannot be recognized past amateur level unless you use a giant tripod, from "big white" to a 70-300 with IS, even if what you're shooting absolutely doesn't need any such support, but you're willing to lug around an F/2.8 zoom all day but shoot at F/16 only... err....
Seriously it's insane, was just at a nice place for autumn leaves viewing and I lost count past 50 of people with the 70-200 series of lenses, mostly 70-200LII too, and few of them are any sort of pro, just part of a photo group/club. It was interesting to see that a majority of users are Canon here, and more Olympus/Panasonic mFT users than even Nikon.

I run into Japanese tourists and retires here in Thailand all the time. They all tell me about Canon and how famous the 300 mm f2.8 lens and others are. And allot use tripods also.. strange.

Got to talking to one guy that was a real camera buff. He was shooting on a nice tripod using a Panasonic and an older 500mm f/4.5. Manual focus with focus peeking. And was getting some beautiful photos. I was amazed. Allot the Japanese guys here really get into it. Having special machined parts made for there lens and cameras.
I felt kinda out of place.

They also tell me Canon provides free services to it's customers there. Free yearly cleaning and adjustments.  Is one thing he mentioned.

38
Believe it when I see it. Along with the 7DII.

39
EOS Bodies / Re: New EOS-1 in 2014 [CR1]
« on: November 21, 2013, 09:14:46 PM »
So high megapixel?  For Canon that means what?  24MP  Might be pushing it... Prob closer to 23.8MP

From past rumors about Canon high-mp cameras in testing, probably 40mp+.

If full frame. Would that be a good camera for birding?

40
The Canon 1Dx and 5D III have been on sale here in Thailand for many months. I asked the Canon dealer here and he said it was Canon that was setting the prices not them.
5D III = 26-2700 dollars
1Dx   = 58-5900 dollars

That is before a VAT refund of 7%. So if I bought it and came back to the USA. I would get an additional 7% savings.
I personally think it is because they are not selling over here! So Canon is marking them down to try to get people to buy them. Strange even at those prices I still do not want one. Just stick to my old camera.

41
I went threw this same issue with the Pentax K-5. It was very stressful.  And the reason I moved to Canon!

42
EOS Bodies / Re: Canon Teaser
« on: November 08, 2013, 07:08:29 PM »
People are studying what appears to be a CG marketing image way too closely.

Who here thinks they really placed a cloth across the new body and photographed it to make this image? Raise  your hands...
I think that is a handkerchief to cry into when we find out that the 7D2 will not be released until 2015

LOL,

43
This is really a great thread. I am verrrry hard on my camera body's. After reading this the 1Dx is definitely not going to be in my bag. I get tremors just reading this thread.

Well then, I hope you never do a Google search for "<your make/model of car> problems" or you'll be walking everywhere you need to go.   ;)

The issue being discussed here doesn't seem to be about how hard/easy one is on the camera, but rather certain units with a problem, much like the clicking batch of 24-70 II lenses.  In my case, my 24-70 zooms silently and my 1D X sensor is oil-free.

I know Nuro, and agree somewhat.  I also watch the hard core birding sites and some there are having the same problem. AF is number one for me, along with durability at this point. When I go on a shoot I always shoot hundreds if not a thousand or more shots in a few hours. Also I live and photograph in a very unfriendly harsh environment. 
Pouring over these type of threads has really paid off for me. No more product testing for me. I am at least a second generation camera buyer.

It may or may not affect me (if I bought). But, it is an issue that would stop me in my tracks. And I cannot afford two, one as a backup. At this point I am happy with my 1D mark IV, I cannot say enough good about it. An amazing camera for my birding photography hobby.

Cheers, Gary

www.flickr.com/photos/avianphotos
www.birdsthatfart.com

44
This is really a great thread. I am verrrry hard on my camera body's. After reading this the 1Dx is definitely not going to be in my bag. I get tremors just reading this thread.

45
EOS Bodies / Re: EOS 7D Mark II Spec List Surfaces [CR1]
« on: October 28, 2013, 07:02:21 AM »
I will pass at this point. To little to late. I moved on.

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