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Messages - AlanF

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Software & Accessories / Re: Which Software to convert Raw files?
« on: May 27, 2014, 06:31:32 PM »
I use DxO as my primary software for RAW. The PRIME noise reduction is incredible, virtually eliminating noise without loss of resolution. Further processing and sharpening are done in Photoshop as it has some nice tweaks and its "layers" is very useful. 

Is using the 1.4xTC better or worse on the 50D than not using it? My gut reaction, based on trying to use a TC with the 100-400, is that a TC on the 150-600mm is a waste of time, with no better resolution and much worse AF and usable only from  f/11.

I think there is a fallacy in Roger's statistics, but I can't really tell because he doesn't provide enough details. First look at the spread.

1.  31.7% of measurements should fall beyond the standard deviation for a normal distribution. Look at the chart for the 5DII (= similar to 7D) vs 5DIII in the lensrental link.  The spread on the y-axis for the 5DII is 650-750, that on the 5DIII is 720-770. That really is enough to notice if you are heavy cropping.

2. The fallacy appears to be this. He is calculating the standard deviation from the mean of the group, and the mean is not the best estimate of the best focussing spot. The best focus is at the very top of the chart!  So, he just measuring a standard deviation from a value which is approximately a standard deviation from the mean.

Look at where there is an incredible difference for the series II lenses between the 5DII and 5DIII. Roger thinks they changed the feedback system between series II lenses and the rest, and  the 5DIII but not the 5DII can handle it.

My experience is 1 7D and 1 70D. My 7D had the same variability in AF as reported by lensrentals, and the AF with the 300mm f/2.8 II + 2xTCIII could be very, very slow, which is why I sold it. My 70D is as consistent as my 5DIII, which is superb, and focusses fast with the 300mm f/2.8 at 600mm.

While on a cycle ride this evening with my 5DIII and 300mm f/2.8 II + 2xTC I saw what I thought was a pigeon on top our University Library, in the red circle, taken on the iPhone. Through the Canon, I recognised it as a peregrine falcon and took 230 shots, in the middle of which it stood up, did some exercises,  and flew off. returned. The crops are really tiny at that distance, but Canon did well enough to get some nice enough photos. I don't think the Tammy 150-600 would have been sharp enough under these extreme conditions.

Animal Kingdom / Re: Show your Bird Portraits
« on: May 18, 2014, 04:00:44 PM »
The one of the crested grebe chick is simply wow!

Animal Kingdom / Re: Show your Bird Portraits
« on: May 18, 2014, 12:27:37 PM »
I use the telephoto lenses as telescopes for most of the time rather than a 'scope on a tripod or a pair of binoculars. Yesterday I was studying a pair of great crested grebes far away on a lake. My wife thought there were chicks on the back of one, see through binoculars. When I looked through the blow-up on the 5DIII screen (300/2.8 x2) I could just make out the chicks and see they were being fed with small fish. These are not publication quality photos but they are great for bird spotting.

These are tiny 100% crops

Animal Kingdom / Re: Show your Bird Portraits
« on: May 18, 2014, 12:15:11 PM »
I like to see birds eating well at their equivalent of Michelin 3 star restaurants. The first taken yesterday on the 5DIII + 300/2.8 2xTC at 600mm f/5.6 iso640 is a Chiffchaff in the woods. The second was taken a few minutes ago of a blackbird high up on the roof, taken with the Tammy 150-600 at f/8 using the 70D at iso 320. Remarkably both of them could sing with their mouths full.

Both hand held and 100% crops. Whatever anyone says to the contrary, the Tammy on a crop is pretty good.

EOS Bodies / Re: Canon 70d center focus point -bug- problem
« on: May 15, 2014, 11:26:38 AM »
My 70D focusses very accurately and consistently with centre spot. It is much, much better than my previous 7D and as good as my 5DIII.

More shovellers

5DIII + 300mm f/2.8+2xTC. 100% crops.

Heron flying, and heron flying with bokeh.

Animal Kingdom / Re: Show your Bird Portraits
« on: May 11, 2014, 04:56:46 PM »
Mother and child.

Great shots everyone.  Some spectacular photos are coming in. 

I'm been thinking about x2 TC III for my 400mm f2.8 IS II. It would be nice to have 800mm range for wildlife. I'm little concern about IQ loss ???
DonĀ“t be. It is still great. Take it to a store and try it out. You will be very pleased. The attached image is a 100% crop
5DIII, 1/1000s, f5.6, ISO400, handheld.

One of the best bird photographers I know uses the 400/2.8 II + 2xTC to get spectacular photos.

5DIII 300mm f/2.8 II + 2XTC III at f/5.6
All 100% crops and at the very limit of what is possible for me. The images are miniscule.  The images aren't great, but they captured my birding yesterday. I was asked why I carried such a large lens, but a smaller one or bridge camera couldn't have done these. The lens was worth every penny for me.

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