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Messages - AlanF

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166
Software & Accessories / Re: DxO Optics Pro 9, Elite Edition
« on: June 29, 2014, 10:25:55 AM »
Does DxO do anything special when it exports to LR? (I don't use LR so don't know what this is about). I just export DxO as a jpeg and then open with PS.

167
Software & Accessories / Re: Apple to Cease work on Aperture
« on: June 28, 2014, 03:08:17 PM »
DxO PRIME NR is truly remarkable.

168
Reviews / Re: Review - Sigma 35mm f/1.4 DG HSM
« on: June 27, 2014, 05:40:19 PM »
9 months further on, are people still happy with the Sigma 35mm? I am thinking of buying one. 

169
Software & Accessories / Re: Apple to Cease work on Aperture
« on: June 27, 2014, 03:12:15 PM »
One of the worse things about Apple is that they will dump software or facilities without caring about their customers. I once had Apple as an ISP, and it lasted about a year, iDisk, and they dropped it, a paid subscription to MobileMe for many years, and it was suddenly pulled.

170
Here are a few bird photos taken at random. 300mm /2.8 II + 2xTCIII on 5DIII. Usually f/5.6 and iso 640

171
Animal Kingdom / Re: Show your Bird Portraits
« on: June 23, 2014, 09:40:19 AM »
Harpy Eagle, Belize

How did you get that close?

172
Lenses / Re: The sharpness curse!
« on: June 22, 2014, 04:10:35 PM »
Good night Madam
Surapon

My dear friend Surapon, you forgot I'm male (MRS are my initials)- but what's in a name :)

Many people here make the same mistake, so I updated my avatar awhile ago as a hint to my gender ;)

Why do you have 38Ca (isotope of calcium with half life of 440 ms) in your avatar?

173
Lenses / Re: The sharpness curse!
« on: June 22, 2014, 06:18:31 AM »
f/64 on a full plate camera has the same Airy disk relative to its size as f/11 on a FF.
A 210mm lens on a full plate is equivalent to a 50mm on an FF.
The hyperfocal distance of a 210mm at f/64 on full plate is 10.1 m, which means setting it at 10.1 m has everything sharp from 5.05 m to infinity.

A 50mm on FF has at f/11 a hyperfocal distance of 7.42 m. So, everything from 3.71 m to infinity will be sharp.

Yes, Ansel Adams would have loved a 5DIII or 1Dx!

174
Lenses / Re: The sharpness curse!
« on: June 22, 2014, 03:53:31 AM »
Sharpness really isn't critical beyond a certain point, so long as you have the right length lens for the job and have time to perfectly compose the shot.  Where sharpness starts to matter is when you don't have that chance, and you have to crop after the fact.  So basically, I care a lot about sharpness in whatever lens I choose to keep on my camera by default, and I don't care nearly as much about sharpness on the other lenses in my arsenal—except for the long zooms when I'm taking photos of birds; then I care again, because I don't own a $14,000 behemoth lens....  :)

Absolutely right about the superteles. You use them because you can't get close to your subjects, especially birds, and the images have to be razor sharp to allow very heavy cropping. The subject bird typically occupies less than 5% of the frame. Here is a detail of an insect in the beak of a robin I took yesterday. The whole crop is only 356x285 pixels from the 22 Mp full frame. Sharpness might not be necessary for an artistic shot or a portrait, and Cartier Bresson once wrote "Sharpness is a bourgeois concept", but you need the ultimate sharpness for some jobs. With a softer lens that insect would have been too blurred.


175
Animal Kingdom / Re: Show your Bird Portraits
« on: June 21, 2014, 08:13:14 PM »
Love this topic! Awesome eagle shots CT John!

Your last one annotated as "loons" looks more like a cormorant, and is certainly not a loon.

http://www.allaboutbirds.org/guide/common_loon/id

176
Photography Technique / Re: Need advice: 60D + 100-400L
« on: June 21, 2014, 08:06:39 PM »
The 100-400 L also is quite variable in IQ and you might have a bad one. Whereas a good copy of the 100-400mm L is a decent lens, I found it sharp enough only when I got close enough to birds that they filled quite a lot of the frame. So. I invested a fortune in the 300/2.8 II + 2xTCIII to get tack sharp images. I subsequently sold my 100-400 and bought a Tamron 150-600mm for not much more. The Tamron at 600 mm has a real edge over a good copy of the Canon for bird photography.

177
Reviews / Re: Sold all my canon gear . . . Then bought a 70d
« on: June 21, 2014, 01:02:40 PM »
Apologies - I read it the first time and forgot on replying to the second post.

178
Animal Kingdom / Re: Show your Bird Portraits
« on: June 21, 2014, 12:07:30 PM »
Robin with insects. The robin, who personally endorsed my ballhead tripod, has a nest with a couple of chicks in my garage. He is feeding them with a high protein varied diet.

All 100% crops at 600mm, f/5.6, hand held, iso 640-1250, speeds 1/200 or slower. I got within 3-5 metres of him.

179
Animal Kingdom / Re: Show your Bird Portraits
« on: June 21, 2014, 10:11:00 AM »
I concede - tripods are useful.

180
Reviews / Re: Sold all my canon gear . . . Then bought a 70d
« on: June 21, 2014, 05:18:30 AM »
Quote

You do realise, that f/4 on FF is still thinner DoF than f/2.8 on APS-C, right?

This is incorrect. A lens mounted on full frame or crop will deliver the same dof at the same aperture. Ie if you mount a 50 1.4 on a 70d or a 6d both will have the same dof. It's the same glass. But the angle of view will obviously be a lot wider on 6d

According to the Depth of Field calculator you are both wrong.

http://www.dofmaster.com/dofjs.html

The depth of field is thicker for the same lens on FF for a subject at the same distance because the field of view is greater for FF.

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