« on: August 06, 2013, 10:42:23 AM »
I'd guess it is a memory card problem. Do you see it on every frame or just one frame? Try reformat the card. Good luck.
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Here is a typical example of what IQ is like for the 300mm f/2.8 II with a series III 2xTC attached. There is no PP on these, no unsharp mask etc, changing of contrast etc. The 5760x3840 full frame is reduced to 1200x800 to have it on screen. There are 100% crops of the centre and the head to show the level of resolution. These are tiny: 210x163 pixels at the centre and 763x619 of the head.
I'd been agonizing for months over this choice that's presently being debated here. I am now comfortable with the 300 2.8 II and 2X III. I would never argue it's equal to a 600 but it sure is hand holdable and the IQ is nothing to be ashamed of. This shot is typical of what I get. It represents a crop of about 1/4 of the original. I wish that the comments that are made in CR could be accompanied by sample pictures because it's so hard to get a handle on what one person considers acceptable and another does not, but I know that's a tall order.
6D 300 F2.8 III with X2 III at 500th F25 ISO 1250 (should have dropped the ISO for this bright shot)
Agree 100% with Neuro's assessment. In my view the only regret you will have is not having proper support and watching the big glass hit the ground. I have used the Wimberley WH-200 and it is very nice. I personally have the same RRS setup as Neuro describes, with the only difference being that I have the TVC-33S (the S stands for "short") which I prefer for travel convenience.
Does anyone here use two 1.4X extenders? If so, can you tape one set of pins and say focus at f8 on a canon ef 400 L f5.6?
Right now I use a 5d mk iii and I find it quite capable with the extender taped . I guess I am thinking, when the new firmware comes in the spring, can I feasibly have a 800 f8(f11 reality)? I understand that the image may degrade, and it will be slower, but I was wondering if anyone with 1d series has tried this?
I am seriously thinking about getting one of the Kenko tele's, but has anyone had any experience using the 2X tele's with this lens?
Your kestral looks awesome, Lnguyen1203. Is that image cropped? If not, even with the 1.4x on the 70-300L you were able to get awfully close to that bird!
Thanks for availing the results of your experiment, Lnguyen1203, that's really helpful. But just to be clear, the Canon 1.4X III only fits/works on the 70-300L throughout the latter part of the zoom range, right? Zoom it in to far and glass meets glass--ouch--right?
I did a quick and dirty experiement today to check the exposure compensation.
#1 photo: 5D3, Kenko 1.4X TC, 70-300L, 0 EV, blown highlight is evidence, couldn't be recovered in LR4
#2 photo: same as above with -1 EV compensation, much better, some highlight on the bird is still blown.
These are quick and dirty experiements, so appologize to those of you who are purists