April 20, 2014, 12:22:29 AM

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Messages - AlanF

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31
Animal Kingdom / Re: Show your Bird Portraits
« on: March 26, 2014, 07:55:58 PM »
The last was a Zebra dove, and this may be a Java sparrow.

Focal length = 600mm, f/6.3, iso 1250, 1/160 s

32
Animal Kingdom / Re: Show your Bird Portraits
« on: March 26, 2014, 07:53:09 PM »
Focal length = 450mm, f/6.3, iso 1250, 1/1250 s

33
Animal Kingdom / Re: Show your Bird Portraits
« on: March 26, 2014, 07:50:40 PM »
Focal length = 213mm, f/6.3, iso 1250, 1/40 s

34
Animal Kingdom / Re: Show your Bird Portraits
« on: March 26, 2014, 07:48:19 PM »
Focal length = 600mm, f/6.3, iso 1250, 1/250 s

(emerald dove)

35
Animal Kingdom / Re: Show your Bird Portraits
« on: March 26, 2014, 07:45:20 PM »
Focal length = 309mm, f/8, iso 1250, 1/800 s

36
Animal Kingdom / Re: Show your Bird Portraits
« on: March 26, 2014, 07:42:49 PM »
I have spent the last couple of days in Hong Kong and have just arrived in Shanghai, where G**gl* is inaccessible. I put the Tamron 150-600mm on a 5DIII through its paces under conditions where I could get really close. Here is a selection from a morning's shooting. All have been reduced to 1200 px width for uploading, each with a 100% crop so you can see the original.

The processing for all has been the same. Taken in RAW, processed in DxO with the only changes done is noise reduction using PRIME and adjusting exposure (no sharpening). The exported jpegs were cropped in PS and sharpened using USM at 100% with 0.9-2 px radius.

I don't know the names of most so please help me by identifying them (I can't G**gle*, remember).

All are hand held. The first is: Focal length = 350mm, f/6.3, iso 640, 1/320 s


37
Software & Accessories / Re: LP-E6 third party and Canon Chargers
« on: March 20, 2014, 12:52:15 PM »
It does not worry me significantly enough to do anything about it since I have the older charger and so I can use the battery. There is just an annoyance that Canon gets so anal that it does these things.

38
Software & Accessories / Re: LP-E6 third party and Canon Chargers
« on: March 20, 2014, 02:12:10 AM »
A good reason to get the OEM battery despite the higher cost.

I think it is a genuine Canon battery.  When Canon introduced the firmware upgrade that rejected third party batteries several of us experienced problems with what we thought or knew were genuine Canon ones.  It now appears that the so and sos have "upgraded" the chargers as well.

39
Software & Accessories / LP-E6 third party and Canon Chargers
« on: March 19, 2014, 07:25:56 PM »
One of my LP-E6 batteries comes up with an error message that it communicates irregularly with my 5DIii but it still works fine. It charges correctly on my old charger supplied with the 5DIII a year ago. Today, I tried to charge it with the more recent apparently identical charger supplied with the 70D.  It doesn't charge but the charger goes into a rapid red flashing mode.   It looks as if Canon has nobbled it's more recent chargers so as not to work with some 3rd party LP-E6s, and my LP-E6 is not recognised as Canon.

41
Lenses / Re: Thinking about this but wanting your thoughts....
« on: March 17, 2014, 05:27:22 PM »
Waiting for the 100-400 replacement is like waiting for Godot. Either buy the 70-200 or if you want 400mm and beyond the Tamron 150-600.

42
Lenses / Re: Visit Guilin, Mountain Range, in China - Lens selection
« on: March 16, 2014, 03:22:26 AM »
By coincidence I'll be there the following week on vacation, organised as a mystery tour by Chinese friends after official visits to Hong Kong and Shanghai.  I had intended to take the 5DIII plus Tamron 150-600 for nature and 24-105 for general.

 I have been trying to persuade my wife to take the 70D with the 15-85 as it could provide a back-up body and I could omit the 24-105 and we would have two cameras ready all the time.  However, she wants something small for her handbag.  She needs something without any buttons, mode dials etc that can be pressed by mistake and set off the self- timer etc. Anything foolproof to recommend (apart from iPhones etc)?

43
Watch it, Guy. The one in the white blouse is my wife, and you wouldn't stand a chance against her. 

44
Firstly, why do you say dust is flatter than sand? Dust particles are usually modelled to be spherical or cylindrical in scientific studies, ie the same shape as sand and certainly not flatter.


How dust is modeled in scientific studies isn't really relevant to it's ability to penetrate a 'dust-resistant seal'.  Neither dust nor sand are actually spherical or cylindrical, but in general dust is smaller and has a higher surface to volume ratio than sand.  Here's some household dust:



Some of it could certainly be described as 'flatter than sand'.


Neuro
An arrest warrant is being issued for your breaking US copyright.

http://images.sciencesource.com/preview/13250858/BP3016.html

Anyway, I think it is a fake, composed of cabbage leaves, chillies, potato skins and bean pods. As if an SEM gives real colours....

45
Firstly, why do you say dust is flatter than sand? Dust particles are usually modelled to be spherical or cylindrical in scientific studies, ie the same shape as sand and certainly not flatter.


How dust is modeled in scientific studies isn't really relevant to it's ability to penetrate a 'dust-resistant seal'.  Neither dust nor sand are actually spherical or cylindrical, but in general dust is smaller and has a higher surface to volume ratio than sand.  Here's some household dust:



Some of it could certainly be described as 'flatter than sand'.



Are sand particles uniform in size and shape? Aren't some of them flatter and some of them smaller? It is a geometric truism that smaller objects (of similar shapes) have higher surface/volume ratios because volume varies as length cubed and area as length squared. By modelled, I mean that the shape of atmospheric dust particles is determined by their light scattering characteristics, and they usually come out on average as spherical or squat cylinders.

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