Canon 70-200 2.8 L or 70-200 4.0 L

03/13/2009 09:27:01 AM · #28

Originally posted by AperturePriority:

Originally posted by Five_Seat:
The 40D will not autofocus with any lens whose max aperture is narrower than 5.6, you need a 1 series body for that, adn even then, I think only the center focus point works.

That statement simply not true. All my lenses are "narrower" than f/5.6, and I have never lost AF capability.

From the 40D manual (an excerpt which is the same as the 1Ds Mark III manual) . . .

With lenses whose maximum aperture is larger than f/5.6
With all AF points, cross-type AF sensitive to both vertical and horizontal lines is possible.

With lenses whose maximum aperture is larger than f/2.8*
With the center AF point, high-precision, cross-type AF sensitive to both vertical and horizontal lines is possible. The center AF point's sensitivity to vertical and horizontal lines is about twice as sensitive as the other AF points.
The remaining eight AF points are horizontal-line sensitive or vertical-line sensitive.
*Except with the EF28-80mm f/2.8-4L USM and EF50mm f/2.5 Compact Macro lenses.

From the Canon website directly::

For the 40D:

AF Points
9 cross-type AF points, including center AF point; fully functional with f/5.6 or faster lenses

Additional high-precision, diagonal cross-type sensor at Center AF point, used with lenses f/2.8 or faster

For the 1 Series:

Type
TTL-AREA-SIR AF-dedicated CMOS sensor

AF Points
19 cross-type AF points (plus 26 Assist AF points)

Metering Range
EV -1 ~18 (ISO 100 at 73Â°F/23Â°C)

Focusing Modes
Autofocus (One-Shot AF, Predictive AI Servo AF), Manual Focus (MF)

AF Point Selection
Automatic selection; Manual AF point selection: 19 AF points, Inner 9 AF points (C.Fn III-9-1), Outer 9 AF points (C.Fn III-9-2)

Selected AF Point Display
Superimposed in viewfinder and on LCD panel

AF-assist Beam
None. Emitted by EX-series Speedlite or optional ST-E2 Speedlite Transmitter

(No mention of apterture limit.)

<><><><><><><><><><><><><><><><><><>

If you slap a teleconverter on a lens and the max (widest aperture) is narrower than 5.6, i.e. f/8.0 then the lens+teleconverter will not autofocus on a 40D. Hence a 70-200/4.0 + 2.0x TC becomes a 140-400/8.0 with no AF on a xxD body.

Message edited by author 2009-03-13 09:28:31.

violinist123

03/13/2009 09:40:45 AM · #29

Max aperture is the wide open aperture not any old aperture wider than 5.6 you can stop down to at will. The lens is not yet stopped down to your aperture of choice while you peer through the viewfinder and autofocus.

Message edited by author 2009-03-13 09:41:40.

Five_Seat

03/13/2009 09:48:58 AM · #30

Originally posted by violinist123:

Right. I guess I am being misunderstood. What I am trying to say is that the TC, because its addition to the lens adds to the optical complexity of the system, reduces the maximum aperture of lens/widest possible opening/lowest f-number of the lens by 1 or 2 full stops, for the 1.4x and 2.0x respectively. When the maximun aperture is f/5.6 or wider/smaller f-number, then the lens will autofocus on an xxD body.

Ken

Canon EOS-7D

Canon EF 70-200mm f/2.8L IS USM II

03/13/2009 09:58:37 AM · #31

Originally posted by stultsphoto:

From what I can tell the price difference in the used I've priced and the new are very close. Where do most people try to find used....ebay or is there somewhere better.

thanks
Shane
Originally posted by LVicari:
Man, I have been trying to get my hands on a used F4 non Is and it is hard to find. No one wants to give them up. Not sure if the IS is worth double the price(I guess I will just use the poor man's IS.. burst mode). Good Luck with your purchase.

Fred Miranda has a good buy/sell section and that's where I got my used 70-200 2.8 IS. These things tend to hold their value but even a hundred or two off for a like-new copy is worth it, IMO.

I agree with the statement above, got for the 2.8 and/or IS if you can swing it; otherwise you may be kicking yourself later. If you plan on doing wildlife, you may find yourself shooting in lower light conditions and it will come in handy.

PhotoDave

Canon EOS-5D Mark II

03/13/2009 10:06:09 AM · #32

Just to add fuel to the AF fire my 40D will AF just fine with my 17-40 F4L with a Tamron 2x teleconverter.

Five_Seat

03/13/2009 10:22:27 AM · #33

Originally posted by dknourek:

Just to add fuel to the AF fire my 40D will AF just fine with my 17-40 F4L with a Tamron 2x teleconverter.

Hmmm. Interesting.

Well then I give up. I guess its better to say that AF will be unreliable with some TCs. All I know for sure sure is that my 70-200/4.0 + 1.4x TC focuses great, as it should. But, I bet that wouldn't be the case with the 2.0x.

Try before you buy, do what makes you happy.

violinist123

03/13/2009 10:47:32 AM · #34

Originally posted by dknourek:

Just to add fuel to the AF fire my 40D will AF just fine with my 17-40 F4L with a Tamron 2x teleconverter.

More than likely because the camera doesn't know the TC is attached, that's common when using 3rd party TC's. Still enough light coming through for autofocus to work, even though less than the amount of light the manufacturer will guarantee autofocus to work at. Does your TC show up in EXIF on your shots? IF you shoot wide open with it attcked, assuming it shows up in exif, what is max aperture recorded as?

Canon EF-S 18-55mm f/3.5-5.6

03/18/2009 02:32:45 PM · #35

I know i've asked everyone this question but would it be stupid for me to buy the 700-200 4.0L non IS. I've sold a lens and have the money for the lens now and not another dime! I can buy the lens or the money will just be spent on a vacation that I'll be going on soon. I want an L lens and I fill like this may be my only chance to get one. Would you buy this lens or just blow the money?

thanks for all the hlep.
shane

jlanoue

Canon EOS-350D Rebel XT

03/18/2009 02:34:57 PM · #36

Shane, as someone in here mentioned, they hold their value, so if you're unhappy with it and want to move up to the 2.8, then it's easy enough to sell, wouldn't be surprised if you used it for two years and its value went up. If your financial situation is good right now, then it's a no-brainer, get it and you won't be disappointed.

john

Scapeshots

Canon EOS-5D Mark III

Canon EF 16-35mm f/2.8L USM II

03/18/2009 02:36:07 PM · #37

I had that lens before and it is a great lens. You won't be disappointed with that lens and you can use it as a stepping stone til your ready for the 2.8L IS version.

03/18/2009 02:38:23 PM · #38

Thanks, I just didn't want to buy just to be buying. I thought this was a great lens but so many said to just save and get the 2.8 IS but I doubt I can do that. When I have money it doesn't tend to stay around long. So if I wait I'll end up with nothing.

Originally posted by wizardry:

I had that lens before and it is a great lens. You won't be disappointed with that lens and you can use it as a stepping stone til your ready for the 2.8L IS version.

Canon EF-S 18-55mm f/3.5-5.6

03/18/2009 02:40:15 PM · #39

Thanks john, I just needed that push to get me to order it. I noticed that many of the L lens jump around in price. It seems like you look at one for 1100 and then the next thing you know you can't find one for less then 1200. Is this normal?

Originally posted by jlanoue:

jlanoue

Canon EOS-350D Rebel XT

03/18/2009 03:03:42 PM · #40

Hi Shane, I don't really see that as I do most of my shopping on ebay, the great marketplace equalizer :-) I did a quick scan and found the 70-200mm non IS f/4 for around 550-650 and the IS version around $1000.

LVicari

Canon EOS-50D

03/18/2009 03:18:28 PM · #41

Originally posted by LVicari:

Man, I have been trying to get my hands on a used F4 non Is and it is hard to find. No one wants to give them up. Not sure if the IS is worth double the price(I guess I will just use the poor man's IS.. burst mode). Good Luck with your purchase.

I just bought the F4 non IS, and man am I excited to put this puppy to use. I found one on craigslist.com and met up with a young student who needed some cash. I picked it up for a good price and is in excellent shape. My set is complete for now. Next upgrade body when I can justify the purchase.

goinskiing

Nikon AF Nikkor 50mm f/1.8D

03/18/2009 03:22:24 PM · #42

Originally posted by LVicari:

Originally posted by LVicari:
Man, I have been trying to get my hands on a used F4 non Is and it is hard to find. No one wants to give them up. Not sure if the IS is worth double the price(I guess I will just use the poor man's IS.. burst mode). Good Luck with your purchase.

I just bought the F4 non IS, and man am I excited to put this puppy to use. I found one on craigslist.com and met up with a young student who needed some cash. I picked it up for a good price and is in excellent shape. My set is complete for now. Next upgrade body when I can justify the purchase.

I have been very happy with the results of my F4L non-IS, as long as you know it's limitations you'll get some fantastic results.

Prash

Nikon D90

03/18/2009 05:26:23 PM · #43

Originally posted by LVicari:

Congratulations on becoming lord of the white one.

Get some pics out here NOW!! :-)

LVicari

Canon EOS-50D

03/18/2009 05:30:52 PM · #44

Originally posted by Prash:

Originally posted by LVicari:

Originally posted by LVicari:
Man, I have been trying to get my hands on a used F4 non Is and it is hard to find. No one wants to give them up. Not sure if the IS is worth double the price(I guess I will just use the poor man's IS.. burst mode). Good Luck with your purchase.

I just bought the F4 non IS, and man am I excited to put this puppy to use. I found one on craigslist.com and met up with a young student who needed some cash. I picked it up for a good price and is in excellent shape. My set is complete for now. Next upgrade body when I can justify the purchase.

Congratulations on becoming lord of the white one.

Get some pics out here NOW!! :-)

Soon! Hopefully.

03/24/2009 11:03:16 PM · #45

Well I finally did it. Thanks for all the help and knowledge. I love my new 70-200 f/4L. I can't tell you how much it means to me to be able to ask a very simple question and get so many great responses. thanks again

shane

LVicari

Canon EOS-50D