Algernon

Joined: 22nd May 2010

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Algernon
There's no difference Gary's used uncalibrated colour space anyway......
So maybe that's what you like

Nice shots Gary.
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Comment by Algernon posted on Happy Birthday *istD at 05/08/2017 - 11:49

Algernon
Slightly different lens (50mm f/1.4 ) but this recent thumbs up is well worth a read by all Pentaxians.....

http://theonlinephotographer.typepad.com/the_online_photographer/2017/07/two-mor...

The original 43mm was considered superior to the 50mm's.

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Comment by Algernon posted on SMC A50mm f1.2 vs FA 43mm f1.9 limited at 04/08/2017 - 08:44

Algernon
It's amazing how these Chameleon Dogs are able to change colour to blend in with their surroundings

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Comment by Algernon posted on Quiz....Dog or tree stump ? at 04/08/2017 - 08:33

Algernon
I really like the USB2 extension cables that have a coloured LED on the end. Makes it easier to find and tells you if the computers connected to the mains. Also easier to see in the dark. My USB3 cables don't have them. I must see if they are available in USB3.

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Comment by Algernon posted on File transfer: USB cable or remove SD card? at 29/07/2017 - 09:31

Algernon
Wimps!! Brooklyn Beckham walks round carrying a Hasselbald

He also has a girlfriend named Beer!

That's what I call butch!

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Comment by Algernon posted on UPGRADING TO FULL FRAME at 28/07/2017 - 12:24

Algernon
Looks an MX on a piece of string

Comment by Algernon posted on Brooklyn Beckham and his Pentax MX at 26/07/2017 - 15:49

Algernon
LV doesn't look at the camera settings. It just opens/closes the aperture in 2 stop steps to get the proper picture on the LV screen at least on the K-5. I think other marques will allow the aperture to be selected. (Maybe the K-1 does? )

Still not much use unless you have some sort of micro adjustment on the lens focus to get within +/- 7mm. A focus rack is easier, but you still have the problem that it will probably only be correct at that one distance.

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Comment by Algernon posted on Focusing issues on Pentax cameras at 26/07/2017 - 13:47

Algernon
Another massive problem with LV focussing is that the lens isn't wide open it gets stopped down so the image has a big DOF

Anyone who ever did printing with an enlarger knows that you have to open the lens fully to get exact focus even when using a grain magnifier.

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Comment by Algernon posted on Focusing issues on Pentax cameras at 26/07/2017 - 12:43

Algernon
pschlute wrote:

The most accurate way to focus is to use live view. Either using the Contrast-Detect AF system, or by manually focussing and using the screen zoomed at 100%. This is because you are then detecting the focus point directly on the cameras sensor.

No it isn't It can be quite good if you focus on something that causes moire on the screen, but it still isn't accurate. See....
http://www.slrgear.com/articles/focus/focus.htm

Summary at end...
"While the overall results were much better than with the other focusing methods though, the worst-case example was still 22% high, well within the "unacceptable" range. Given that, manual focusing via even a highly-magnified Live View display simply isn't reliable enough to use for lens testing."

And he used a powerful magnifying glass as well

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Comment by Algernon posted on Focusing issues on Pentax cameras at 26/07/2017 - 12:04

Algernon
You can't be sure that the RED X is exactly over the detection point, or that it doesn't lock onto something nearby, that's why you need to focus on something parallel to the camera back. It's also easier with a tripod with a focusing rack.

Most of my tests are MF based on the BEEP. There's usually a beep moving in towards the target and another beep moving backwards into the target with about 25mm between the two. You have to decide which one to use. I normally set it so that I catch the beep moving into the target. +/- 7mm is usually possible.

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Comment by Algernon posted on Focusing issues on Pentax cameras at 26/07/2017 - 11:23

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