Canon 2X Teleconverter - DPChallenge Forums

04/14/2006 02:29:21 PM · #1

*I did search the forums,

I want rent on for 70-200 2.8 IS USM,

Questions
1. i know my aperature will drop to 5.6
2. Will my image quality drop
3. is focusing slower,
4. any pros and cons you may have,

would i just be better off renting a 400MM,

what i need it for is, I got a spot on a press boat to photograph the start of the Newport to Ensada yatch race and 4 houres into the race, i am thinking i need some range,

and any tips you guys could give me for shooting from the ocean on a boat.

Thanks

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

04/14/2006 02:48:52 PM · #2

also, do you think it will be really bright so should i get a filter of sorts.

hopper

Canon EOS-80D

Canon EF 35mm f/2 IS USM

04/14/2006 02:53:38 PM · #3

if you're going to rent anyway and you're not sure what kind of range you'll need, why not rent the Sigma 50-500 or 80-400 with IS?

yes, image quality will drop

yes, it'll focus slower

Mr_Pants

SiPix Blink

04/14/2006 02:54:24 PM · #4

A shot using the TC at effective aperture of f/5.6

100% crop

A shot using the TC at f/10

100% crop

Focussing is a little slower, but not drastically. In half-decent light, the difference is not really noticeable to me. Focussing, however, will be less accurate, as the effective aperture during focussing is smaller than f/2.8, so the high-precision sensors will not be in use.

The zoom would probably give you much more flexibility in composition. Unless you go for having one body with the 70-200 and a second with the 400.

theSaj

Canon EOS-20D

04/14/2006 02:55:46 PM · #5

I personally would recommend renting the 100-400mm or possibly even the 50-500mm Sigma since you might wasn something wider than 70 or 100mm when the boats come in close to the race line.

;)

Message edited by author 2006-04-14 14:56:12.

Mr_Pants

SiPix Blink

04/14/2006 02:58:43 PM · #6

Originally posted by hopper:

if you're going to rent anyway and you're not sure what kind of range you'll need, why not rent the Sigma 50-500 or 80-400 with IS?

yes, image quality will drop

yes, it'll focus slower

From my experience, the 80-400 is quite a bit sharper than the 70-200 with a 2x TC. It also has a greater zoom range (taking off the TC mid-action is not really an option). The downside is the fact that the Sigma focusses a lot slower and the zoom ring needs quite a bit of turning to go from one end of the range to the other. The OS works quite well, although it seems to take a little longer than the 70-200 to fully activate.

04/14/2006 02:59:08 PM · #7

im going to have one camera the 5D with my 24-70, and a 20D with
the 70-200 and teleconverter or 100-400
its going to cost a littl4e chunk of change to rent one though

Message edited by author 2006-04-14 15:02:04.

04/14/2006 03:08:48 PM · #8

Originally posted by TroyMosley:

im going to have one camera the 5D with my 24-70, and a 20D with
the 70-200 and teleconverter or 100-400
its going to cost a littl4e chunk of change to rent one though

also what would it be if i used a 20D w/1.6 crop anda 2x teleconverter, taht would make it at 224-640

Message edited by author 2006-04-14 15:11:27.

hopper

Canon EOS-80D

Canon EF 35mm f/2 IS USM

04/14/2006 03:13:37 PM · #9

640mm from a boat ... i hope it's a real big, non-moving, unaffected by wind and choppy water boat ... otherwise sharpness may be an issue.

Originally posted by TroyMosley:

also what would it be if i used a 20D w/1.6 crop anda 2x teleconverter, taht would make it at 224-640

Stagolee

Kodak Easyshare C180

Canon EF 50mm f1.2L

04/14/2006 04:12:37 PM · #10

I have 70-200 2.8 USM, non IS and a 2x teleconverter and I'm dissapointed with both sharpness and focus speed. I hardly ever use it only sometimes when in brilliant sunshine, infact I plan to sell the teleconverter.

Basically if you want the reach and maintain sharpness you need to get a prime.

Just my view based on my experience but maybe the IS will help you.

Message edited by author 2006-04-14 16:13:09.

Caeclyd

Canon EOS-40D

04/14/2006 05:18:36 PM · #11

Originally posted by keegbow:

I totally agree. I asked a similar question here last week about the 2x converter. After lots of deliberation I bought the 2x. I really think that it is pants. How the hell Canon have this on the market I do not know. Do they ever take test shots with their equipment? Me thinks not. I honestly think that they put Â£Â£ or $$ first......Rant over.

Message edited by author 2006-04-14 17:19:14.