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Messages - IMG_0001

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1
EOS Bodies / Re: Buying second hand, avoid low shutter count.
« on: January 26, 2015, 04:42:46 PM »
Engineers, we are fussy nitpicking little critters aren't we? Looking back, I feel like most great things we accomplished were made to prove someone else wrong...

*EDIT: please take this post with a pinch of salt.

I was a science major in college.. for me it was not finding the truth, but getting close to what may be considered the truth...  I was also a philosophy minor, but that was mostly deleted over time.

Truth is never found in science, its just made up from a bunch of hypotheses. Personally, the more involved in sciences I get, the more I feel like I NEED Philosophy to get by.

I like to think I take care of my stuff... I too keep the boxes... So maybe we are simply wanting to buy from those who share our presumptions...  is that projecting in psychology?  I took psychopathology in college... So I could diagnose cramming a lens where it doesn't belong... Butt, that is neither here nor there.

I see what you did there  ;D. I think I'll butt out of the conversation, it's getting stuffy in here.  :P

Just because someone has the original box doesn't mean they've taken care of the item, but as you pointed out, those of us who do keep the original stuff feel more comfortable buying from others who do the same. Doesn't guarantee they took better care of the equipment, but it feels a bit more reassuring . . .  ;D

As for keeping boxes, I keep mine. However, I'm not sure how well I keep my gear compared to others. I have to admit shooting in pretty cold, or pretty wet, or dusty conditions without caring much. However, after shooting I try to clean a bit and store everything in a protective bag. I guess I'm in the lower echelons of people who take good care of their equipment.

2
EOS Bodies / Re: Buying second hand, avoid low shutter count.
« on: January 26, 2015, 01:38:12 PM »
Engineers, we are fussy nitpicking little critters aren't we? Looking back, I feel like most great things we accomplished were made to prove someone else wrong...

*EDIT: please take this post with a pinch of salt.

3
As the song goes:

'Get a haircut... And get a real job!'

If such a thing still exists...  :(

4
Thousand Thanks to My Dear teachers and My dear Friends.
Now, I can understand the difference UNITS of Light per Camera Flash and Studio Flash/ Lights now.
Yes, As Hobby, I do not think I will need 2 of 500W Studio Light = $ 1,200X 2, US Dollars soon, Just Put  1, 2 or 3 Flashes on the 72 Inches Silver/ White Reflected Umbrellas, and That should be enough for Big Group Photos at the longer distant from Flashes.
Have a Great Weekend, Sir/ Madame.
Surapon

Dear Surapon,

It is good to know that multiple lights even if set together in a single modifier, won't produce the same shadow as a single more powerful head. With multiple lights, you are likely to be able to see as many distinct shadows as thete are flashes. Sometimes it might look wrong and unnatural, sometimes its not a problem. This might not be that bad for large group photos, but might matter for headshots.

5
EOS Bodies / Re: Buying second hand, avoid low shutter count.
« on: January 22, 2015, 04:46:11 PM »
Probably not of great statistical value and certainly not from an independent and identically distributed random sample. Yet, even without referring to this 'study', I would certainly not worry much about buying a camera with a few tens of thousands of shutter actuation. Even more so for pro level equipment such a 5D or 1D series body. Failure of mechanical parts subjected to dynamic loading tends to come with significant scatter. As a result, if Canon is to have a good reliability (which I doubt would be less than 95% survival with 95% confidence) and limited warranty claims, I would not be surprised that the median life would be close to a full order of magnitude more than the warranty.

On the other hand I would be more worried of a camera with a high video usage because of the heat generated in video. Nevertheless, even high video usage would not be a dealbreaker for me if the price was right.

6
And as a side note, it is also important to remember that the flash power needs to be quadrupled in order to double its GN.

*Typo edited...

7
Dear Surapon,

I think that the main problem is that the studio flash is meant to be used with modifier and the lit area is not going to be a given.  Calculating an equivalent GN is therefore going to be a challenge as for a given power (the W or Js rating of studio strobes), the intensity of the light will change and the exposure would also vary accordingly. On the other hand, remembering that the GN is associated to a focal length for hotshoe flash, it implies a given area covered by the flash light.

That being said, I know that some studio flashes state a GN with a specified reflector angle, which can in turn be converted to equivalent focal length and compared to a hotshoe flash. I also recall reading that a 60m GN flash as Canon's 600ex-rt has about 60-70W capacitor energy, but this last statement should be verified.

I hope this helps.

8
Lenses / Re: The f/4 Pentacon
« on: January 06, 2015, 05:09:39 PM »
Since the 5 are all f/4, shouldn't it be something like "the pentaQUADrigon" or the "quadro-pentaculous team" or something, to get both the 5 and the 4 in there somehow?

I like 'The quintet of 4'...

9
I would not worry to much as the gear is going to be stored at those temperatures. However, be aware that the polymer matrice of a carbon fibre part may turn quite brittle at lower temperatures so avoiding impacts while in use might be wise. Also, although the lower temperatures should neither be a problem for the carbon, nor for the aluminium parts, differential thermal expansion might stress and fragilise/weaken the interface between carbon and alloy parts. Frequent freeze-thaw cycles could then affect joint integrity.

10
Lighting / Re: Studio Light Power Question?
« on: November 22, 2014, 02:43:32 PM »
I am not very experienced with studio lights but I've researched them a bit in the last few months and I would like to add a couple comments.

First is that from my understanding, the Ws rating is not really a normalised and directly comparable measure. It should be comparable within a given brand, but might not be between brands. For example, the light output from similarly rated lights might differ because of the tube and electrics\electronics efficiency, reflector geometry and reflector efficiency.

Second, because your actual flash has 5 stops does not mean that a lower powered flash will also have five stops. You might pretty well have a 4 stops 250Ws light that has the same minimum output as your larger strobe. Apparently, the actual precision and range of adjustment appears to be one of the most evident compromise of cheaper strobes.

I didn't really think about that - different brands having different ratings, but it makes sense.  Fortunately, I have two Bowens 500R's and I'm thinking about getting the 250R's to go along with them.  I would imagine that they would have similar performance, only the 250's would be a stop dimmer at both ends compared to the 500's - the 500s are 15-500, and the 250s are 7-250.

If you are tout stay within the same brand and series, the outputs should be consistent with the rating.,

11
Lighting / Re: Studio Light Power Question?
« on: November 21, 2014, 03:42:26 PM »
I am not very experienced with studio lights but I've researched them a bit in the last few months and I would like to add a couple comments.

First is that from my understanding, the Ws rating is not really a normalised and directly comparable measure. It should be comparable within a given brand, but might not be between brands. For example, the light output from similarly rated lights might differ because of the tube and electrics\electronics efficiency, reflector geometry and reflector efficiency.

Second, because your actual flash has 5 stops does not mean that a lower powered flash will also have five stops. You might pretty well have a 4 stops 250Ws light that has the same minimum output as your larger strobe. Apparently, the actual precision and range of adjustment appears to be one of the most evident compromise of cheaper strobes.

12
Software & Accessories / Re: Hello Windows 10
« on: October 18, 2014, 08:00:55 PM »
One last question in regard to windows going to be subscription based. Am I right by saying that Mac OS is already a bit like that. Although buying the computer provides you with a lifetime subscription...

13
Software & Accessories / Re: Hello Windows 10
« on: October 18, 2014, 07:57:06 PM »
My new machine is windows 8.1 laptop with touchscreen. I don't use the touch function much, but Win8 sure is an upgrade once you get used to do it. However, i've tried it on an asus transformer tablet and found that it really did not scale well to the tablet format. Version 10 sure has something to improve in that regard.

14
Software & Accessories / Re: Hello Windows 10
« on: October 18, 2014, 02:09:14 PM »
For the last few Years up until this spring, I've been usign Linux quite a bit for my work and play. I'll be back to a dual boot machine soon but I've just not had the time to set things up since I had to replace my computer. I'm a big fan of open source and absolutely hate the implications of the cloud based solutions for storage and software licensing. The cloud is conceptually interesting, but philosophically has so many pitfalls. But I'm drifting off topic here.

Now, back to our business, although I tried ufraw, rawtherapy and darktable and initially liked them, I still find LR too lead the pack by a fair margin. So I do most of my editing under windows. However, if both windows and the editing software go the cloud way, be assured that I will stay firmly rooted to the ground and happily back to Linux.

By the way, just before my former computer crashed, I was about to try digikam and showfoto on linux. I did not get to try it much but it appeared to be pretty feature rich. I had particularly been impressed with the distortion correction tool. Anybody tried it for real and has any comments to give?

Thanks

15
When I started out with photography, I did try the tone mapping technique, only to never look at the images again. Well, not until now...

Those were shot during my stay in the Netherlands, no needs for critics and comments.

Now, I feel like regular processing of images is already difficult so I better leave HDR tone mapping out of the equation. At worse, I might try to combine exposures, both no more HDR.

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