When one chooses to use tele-convereters, one has to accept that there will be IQ loss and slower AF. Using a teleconverter successfullly mean you need to stop down further. Tele-converters magnifies a lens's fault. The new added "ability" of the 5DMK3 to AF at F8 have led many to rush out to buy tele-converters. Not that they cannot produce acceptable results, but careful PP in the sharpnening area is important.
The best "converter" is the crop factor in APS-C sensors. In fact, the Nikon 7100 is clever in allowing in-camera cropping, apart from F8 capability. APS-C is 1.5x plus another 1.3x crop if desired. Now, isn't that GREAT!!!!The Nikon D800 also has this in-camera sensor crop ability.
My take is that if Canon has introduced a software in the 5DMk3 whereby it can "crop" in the sensor by a factor of 1.4X (15MP?), the F8 capability would not have been necessary. Using the lens at f8 (and further stopping down for better IQ) is pretty slow! And slower AF too...
If anything, that F8 thingy should have been in the 5DMK3 the day it was released. What the heck is Canon up to?
Venus wrote:
My take is that if Canon has introduced a software in the 5DMk3 whereby it can "crop" in the sensor by a factor of 1.4X (15MP?),
Don't worry we already have that capability. It is called cropping in post. What does it matter if one does it in LR or the camera does it for you?? How would that improve the IQ? And I don't agree that cropping the 5D3 image is better than using the teleconverter. This just isn't true. If it was no one would buy the teleconverters.
Your point about APS-C being the best TC is sometimes true if the sensors are of equal quality or generations. Personally I prefer my 1.4TC shots on my 5D3 over a non-TC shot on my 7D. However, maybe it is closer in Nikon land??
arbitrage wrote:
Don't worry we already have that capability. It is called cropping in post. What does it matter if one does it in LR or the camera does it for you?? How would that improve the IQ? And I don't agree that cropping the 5D3 image is better than using the teleconverter. This just isn't true. If it was no one would buy the teleconverters.
Venus wrote:
When one chooses to use tele-convereters, one has to accept that there will be IQ loss and slower AF. Using a teleconverter successfullly mean you need to stop down further. Tele-converters magnifies a lens's fault. The new added "ability" of the 5DMK3 to AF at F8 have led many to rush out to buy tele-converters. Not that they cannot produce acceptable results, but careful PP in the sharpnening area is important.
The best "converter" is the crop factor in APS-C sensors. In fact, the Nikon 7100 is clever in allowing in-camera cropping, apart from F8 capability. APS-C is 1.5x plus another 1.3x crop if desired. Now, isn't that GREAT!!!!The Nikon D800 also has this in-camera sensor crop ability.
Digital crop is inferior to optical crop as has been shown many times. Also I rarely have need to stop down when using a 1.4x TC if the base glass is very good. Sure IQ might drop off but the base line is so good, the decline is barely noticeable and I'd prefer the higher shutter speeds/lower ISO which will have far greater effect on IQ than stopping down.
very boring images, I just shot. however light was down, and I had to use flash. so
100-400L, Kenko 1.4x DG, f8, iso 250/ 560mm, flash. 100% crops. first is strait in to LR with all defaults (25/1/0/0 sharpening), second with my default slight sharpening (50) slight increase in contrast and clarity (picture style is neutral, this is equivalant to about standard jpeg) http://farm9.staticflickr.com/8393/8702763081_fc62a7aefc_o.jpg
Using my 5D MK III, with 100-400mmL and 1.4X MK II TC, I have to set the distance limiter in order to get reasonably fast AF. Otherwise, I can stack both my 2X and 1.4X and get the same slow AF speed.
I gave it a quick try the other day with the new firmware. I was 30 ft away, so it is a very severe crop. If I did not have the TC on, the image would have been far to tiny to crop.
