May 04, 2015, 08:08:03 AM

Recent Posts

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21
Deals on Gear / Re: Deal: Lexar 128GB Professional 1066x CF Card $139
« Last post by DARSON on Today at 06:22:21 AM »
Yesterday this deal was looking like somthing amazing... more than 50% reduction. From around 270$ to 139$  Today  the same card cost 179$ after 27.59$ discount (base price now 206.58 compare to almost 270 yesterday).
Was this card overpriced before?. Artrificially maybe?
As a customer I should not complain and I'm not.
 I'm  just curious why base price changed overnight for more than 60$
http://www.bhphotovideo.com/c/product/1022078-REG/lexar_lcf128crbna1066_128_gb_pro_compact.html
22
Landscape / Re: Post Your Best Landscapes
« Last post by lion rock on Today at 06:18:48 AM »
Thanks Click.
Falling Spring, VA.  Was hoping to see a rainbow at the falls, but light wasn't cooperating.  My frontal long exposure also failed because of the mist on the lens.
-r



Shot these today.
-r

Very nice. I especially like the first shot.
23
Landscape / Re: Post Your Best Landscapes
« Last post by Click on Today at 06:11:51 AM »
Shot these today.
-r

Very nice. I especially like the first shot.
24
Software & Accessories / Cannot buy from Adobe!
« Last post by martti on Today at 06:11:11 AM »
This is crazy. Adobe marketing is so incredibly idiotic I have never seen anything like it.
I live on an island here in the Indian Ocean. Legally, this is part of France but in everything that concerns trade this is something else.

So I cannot get certain things here from French suppliers or Amazon or now Adobe.
It is impossible to get to the buying segment on the Adobe website. The told me it is because I have a 'hosts' file problem. Well, I fixed that problem whic was not the problem after all.

I called the suctomer service and they told me that the problem has now been solved.
Except that I cannot get the upgrade or anything else from their shop.

I confess...I will pirate it now. I have spent many hours trying to get over their idiotic distribution hurdles.
Enough.

When I bought the LR4 I only got it while I was in Norway.
LR5 upgrade only needed a couple of emails with the French dealer. I already thought that somebody had been sacked, so easy it was.
With the LR6 it seems that Adobe has not only rehired the old idiots but also given then some speed to keep them awake until everything is ruined.

WTH is wrong with them?
25
Animal Kingdom / Re: Show your Bird Portraits
« Last post by Click on Today at 06:08:51 AM »
Pukeko Chicks
Red Legged Partridge
MyFavourite - KAKA

Very nice series. I especially like the 3rd image.
26
Lenses / Re: Teleconverter
« Last post by danski0224 on Today at 06:08:22 AM »
I do know that one of the rental outfits has available "damage insurance" to cover just about anything that could go wrong.

The main suggestion about renting that 100-400II is that would allow you to leave the other similar lenses at home and maybe bring something else or two, that's all. 

Have a nice trip :)
27
EOS Bodies / Re: EOS-1D X Mark II Dynamic Range [CR2]
« Last post by exquisitor on Today at 05:57:40 AM »

The thing with the read noise is a bit more complex. There are three sources of the total read noise: read noise (RN) from the sensor itself, amplification noise (AN) and analog-to-digital converter (ADC) noise. At the low ISO most cameras are ADC noise limited, with the higher ISO ADC noise decreases and after roughly 1600-3200 most cameras become RN limited.
The reason for high ADC noise is (as I understand it) is the high level of the maximal signal at low ISO (corresponding to full well capacity). ADC converters have certain signal-to-noise characteristics, expressed like percentage of the full well capacity signal fed to the ADC. The full well capacity is ISO dependent and is maximal at the lowest ISO.
At low ISO there are a lot of electrons in highlight areas, however in the shadow areas you've got much less electrons. Because all data from the sensor processed in the same way, the signal from the shadow has more noise form ADC. For example if we have ADC with 1 %SNR characteristics, we will get 10 electrons noise at 1000 electrons signal at ISO 100 in highlight area (SNR =100) and ... same 10 electrons noise at 20 electrons signal (SNR = 2). This is why Canon cameras have high shadow noise. Sony's sensors have much less ADC noise.
So now the trick with dual ISO readout is to make two parallel ADC channels and process all data simultaneously at different ISO. At low ISO the highlights will get processed the best way as described above. At high ISO the shadows will be processed with lower full well capacity and respectively with lower maximal signal. So as in the example above, if we have maximal signal of 62.5 electrons at ISO 1600, the noise in the shadows will become 1/16 of that at ISO 100: 0.625 electrons corresponding to SNR of 32.

Thank you Sir. Can't say I am ready for a quiz, but I get the idea.

You're welcome! If you want get more details on this topic and generally how the sensor works, I would recommend this article: http://www.clarkvision.com/articles/digital.sensor.performance.summary/index.html .
28
EOS Bodies / Re: EOS-1D X Mark II Dynamic Range [CR2]
« Last post by exquisitor on Today at 05:52:33 AM »
Very intresting. Even as a non-tech guy I kinda get the idea. Will this trickle down into a 5DIV or 5DX or whatever may come out next? I don't mind if it is 2016 or 17, my 5D3 still rocks...

There was a rumor that this tech will come to 5D IV. Now it's used in C300 II.
However it's not clear, if the dual ISO will be used in 1DX II. It could be a new ADC design that has lower noise. IMO dual ISO is still sounds more plausible. What ever the reason is, Canon is avoiding to use on-chip-in-row ADC like that found in Sony's sensors.
29
Macro / Re: Bugs Bugs and more Bugs
« Last post by TheJock on Today at 05:41:19 AM »
Hey mate, only just saw your post. Been a very busy period and haven't had the chance to log here or either Flickr to add more photos. Now, taking your queries one at a time.
I did try using a soft box but what ended up happening was the soft box covering my subject thus getting it under exposed. see here: https://www.flickr.com/photos/antonispapavasiliou/9328535364/
Unfortunately since then i moved to another house with less of a mess in the garden which means i don't get to see as many bugs anymore unless i venture towards the country a bit which would scare the old people around my area ( a slow moving guy on his knees for hours and hours trying to shoot bugs)  ;D ;)
I also see what you mean by the flash "affecting" the colours a bit but i'll be honest i kinda like it ! I'd prefer a more natural feel to it but i guess giving them a "model" look sometimes gives a different feel to the photos.
As for Flickr am not sure how much safer it is from Facebook ( i know FB owns any photos that are uploaded there) but i like the interface you get with Flickr. Strictly photography and no other annoyances… As for a copyright symbol and logo just make a template using any software you have and then layer it onto of your images ! That's how i do it !!
P.s. Thumbs up on your photos on Flickr.
Thanks so much for your reply and positive comments, I’m sorry it’s taken me so long to reply too, I’ve also just moved house so feeling your pain!!
I found this little fella on the window in the kitchen about 2 weeks back, I really see the benefit that the L version (with IS) will afford me over my current non L 100mm lens, another expense LOL ;D
30
EOS Bodies / Re: EOS-1D X Mark II Dynamic Range [CR2]
« Last post by K-amps on Today at 05:37:50 AM »

The thing with the read noise is a bit more complex. There are three sources of the total read noise: read noise (RN) from the sensor itself, amplification noise (AN) and analog-to-digital converter (ADC) noise. At the low ISO most cameras are ADC noise limited, with the higher ISO ADC noise decreases and after roughly 1600-3200 most cameras become RN limited.
The reason for high ADC noise is (as I understand it) is the high level of the maximal signal at low ISO (corresponding to full well capacity). ADC converters have certain signal-to-noise characteristics, expressed like percentage of the full well capacity signal fed to the ADC. The full well capacity is ISO dependent and is maximal at the lowest ISO.
At low ISO there are a lot of electrons in highlight areas, however in the shadow areas you've got much less electrons. Because all data from the sensor processed in the same way, the signal from the shadow has more noise form ADC. For example if we have ADC with 1 %SNR characteristics, we will get 10 electrons noise at 1000 electrons signal at ISO 100 in highlight area (SNR =100) and ... same 10 electrons noise at 20 electrons signal (SNR = 2). This is why Canon cameras have high shadow noise. Sony's sensors have much less ADC noise.
So now the trick with dual ISO readout is to make two parallel ADC channels and process all data simultaneously at different ISO. At low ISO the highlights will get processed the best way as described above. At high ISO the shadows will be processed with lower full well capacity and respectively with lower maximal signal. So as in the example above, if we have maximal signal of 62.5 electrons at ISO 1600, the noise in the shadows will become 1/16 of that at ISO 100: 0.625 electrons corresponding to SNR of 32.

Thank you Sir. Can't say I am ready for a quiz, but I get the idea.
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