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Messages - well_dunno

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Just got enabled to give positive vibes and everyone got +1 in this thread as promised  :)


Lenses / Re: Is my 70-200 2.8 mk.II back focussing?
« on: January 16, 2012, 02:06:40 PM »
I would use the focus test chart (available for download for free) and shoot on a tripod to see whether the focus/misfocus has any consistency.

I am relatively new to photography so probably nothing new to you guys... Either case, wanted to give feedback...  :)


Site Information / Re: Should karma remain on the forum?
« on: January 13, 2012, 07:44:38 AM »
Received both smites on karma related topics, last one due to the "+1" post above  ;D

Site Information / Re: Should karma remain on the forum?
« on: January 13, 2012, 05:05:36 AM »
Karma is good, it generally keeps the tone civilised I think there is probably a bit of vengeful smiting but i think i applaud more often if i find a post particularly helpfull or brings some good information out

I agree. I've noticed that some participants behave a bit more civilly after receiving some bad Karma. It reduces the number of nasty drive-by comments. No one takes it too seriously, but it's not useless either.


EOS Bodies / Re: Why aren't there full-res 1Dx samples?
« on: January 12, 2012, 08:02:46 AM »
Perhaps Canon was waiting for D4 to be announced for last tweaks on 1DX?

Still don't have enough posts to be able to give positive vibes... Everyone in this thread is going to get +1 once I do  ;D

Lenses / Re: Diffraction: f-value or aperture diameter?
« on: January 11, 2012, 04:09:54 PM »
Nope.  The diffraction effects correlate with f/number, not with iris diaphagm diameter.  That's because the distance between the iris diaphragm and focal plane also matters for diffraction.  To expand on your example, 300mm f/11 has an iris diameter twice as large as 150mm f/11, which you are thinking would decrease the effect of diffraction, but at 300mm that iris diaphragm is also twice as far from the focal plane, which increases the effect of diffraction.  So, iris diaphragm diameter and focal length effectively cancel each other out, and the f-number ratio is the determining factor.

Thank you!  :)

haha! This must be one of those situations WildBill was referring to in question and answer 9  ;D

Lenses / Diffraction: f-value or aperture diameter?
« on: January 11, 2012, 03:29:10 PM »
Hello everyone,

A question on diffraction: frequently  diffraction effect seem to be mentioned with reference to f-numbers, however, if I am not mistaken, diffraction effect negatively correlate with the diameter of the lens aperture and not with the f-number itself. As a result, everything else remaining equal, the effect should  be the same at 150 mm f/11 and 300mm f/22.

Just trying to get it clear for myself so any info/reflections are appreciated! :)


 thepancakeman and neuroanatomist,  thank you both for the info!

Apparently I received a negative karma for my question in the process ;D

K-amps, count me in for the next round...  ;D

ehm, forgive my ignorance but how does one give karma?  ;D

Software & Accessories / Re: PC or MAC
« on: December 21, 2011, 02:12:17 PM »

This is my first post but I have been following the forums for a few months so firstly, greetings to you all! :)

I personally prefer laptops running windows and always install linux in a separate partition (I personally go with ubuntu but naturally a lot of other options are avaliable). Having windows feels convenient basically even though I do not use it frequently. Linux environment, just like mac, is free of malwares so you do not consume the resources of the computer on  protecting it. Then most of the software available are under general public license and free. Also, most of the time,  it is possible to find a program for any given purpose. Linux systems do require more expertise to manage in comparison to windows though.

Even if you prefer windows and something happens to it, you can run linux and get your files out (non-hardware failure situations naturally)...

Just my thoughts...



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