April 16, 2014, 04:07:26 AM

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Messages - eninja

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1
EOS Bodies - For Stills / [Q] When to not use ETTR?
« on: March 18, 2014, 05:43:51 AM »
I often use Av mode if possible and set my desired exposure 2/3 stop from zero.

When is the scenario, where in, it is desirable set exposure to 0 or negative?

Maybe like on a candle cake, when I want to get standard exposure (exposure 0) out of the candle?

Thanks.

2
Canon General / Re: Accurate Color Capture
« on: March 16, 2014, 10:12:17 PM »
I read about color filter array.

Sorry for getting into basic and fundamentals.

Is it, One Pixel can be Red, Green or Blue or Combination of it right??

Does that mean in a bayer mask, 1 set of RGBG is consider One Pixel?

Sorry, I got confuse.

3
Canon General / Re: Accurate Color Capture
« on: March 14, 2014, 01:36:33 AM »
Thanks again for sharing. I believe for my case, samples are inorganic, in contrast to your side, organic. I hope its valid to say this.

Quick question.
How about exposure settings. We can narrow down to shutter speed settings. If you increase exposure, color as output by the camera will be different from with short exposure. e.g. at shorter exposure time fluorescence come out as red, at longer exposure, resulting image is orange.

What is the science/reason behind this?

Thank you.

4
Canon General / Re: Accurate Color Capture
« on: March 13, 2014, 11:13:31 PM »
My goal is, to gather few of our samples and record its fluorescence and able to compare them.
I'm still digesting what you've said.

Thanks.

5
Canon General / Accurate Color Capture
« on: March 13, 2014, 09:51:23 PM »
im an engineer working under R&D. im not a rocket scientist. im studying fluorescence of material. Fluorescence is, in my term, when you illuminate a given sample single wavelength of light, the sample absorbs this light energy and in return it glows or gives of light with color.

Now I am using a DSLR camera to capture the fluorescence of a given material, to record it. I don't know how to construct my questions. Many factors: Different Camera, different settings, will produce different color output as seen by naked eye, also depends on the screen, screen settings. white balance?? and etc.

With all of this factors, how can I narrow down, or make these variables constant as much as possible such that i can compare color output, any given time.

What are the factors that affects the color being output by the camera. Also does HSB, (Hue, Saturation, Brigthness) plays important role in this topic?

Thanks.

6
EOS Bodies - For Stills / Re: 6d issue
« on: February 20, 2014, 09:09:16 PM »
what shutter speed do you use?
electric florescent light is actually blinking. if you use high shutter speed, you may capture dim or bright.
hope u get the point.

7
EOS Bodies - For Stills / Re: Best Camera for New-bie
« on: January 02, 2014, 03:22:15 AM »
G1X.

8
I got the 6D for about one year now.
The least description of 6D that makes me happy "owning" it is that:

"The 6D is better than 5Dii in about every aspect."
And 5Dii have took a lot of great pictures.

Just sharing what I thought about the AF of my 6D.
Im very amateur and shoot still people.
And I really dont check and compare if focus was spot on. 
At decent light like normal house room with fluorescent lighting or sunlight outside or soft light outdoor.
Outer focus points works.

I am happy with 6D Outer point AF, can't say much.

edit:
And I am using the Un-sharpest Lens of all: EF 28mm F1.8.
( i am the only person who love 28mm, not to wide and not too long for 1 meter distance shot)
And the cheapest lens of all: EF 75-300 F4-5.6 iii

picture from EF 75-300: https://www.dropbox.com/s/ic0hcyf4gzncd18/IMG_4315.JPG



9
Lenses / Re: Lots of New Lenses Coming in 2014 [CR2]
« on: November 11, 2013, 04:05:08 AM »
More pancakes with stm please!!!

28mm pancake. So slim I could die. haha.

10
Lighting / Re: 90EX on a 5D3?
« on: November 11, 2013, 01:16:52 AM »
well i got a 90ex, main purpose is to pair with 430ex II. I use it with my 6D.
I am an amateur, so i don't observe the recycling time. But should be fast, maybe a second or 2. i dont know.

Regarding power,
I use 90ex as fill flash, catch light to subjects face or eyes.. or when the background is bright, need to expose on background and fill flash the foreground. I don't intend the 90ex to light the whole scene, with 6D i can increase ISO to like 10000 and would still be good. So the power is OK, after all point and shoot got smaller flash and can do its thing, what more 90ex, a bit bigger.

Also i dont use telephoto, i believed 5meters away, 90ex fill flash still can do the job.

11
EOS Bodies / Re: Patent: A Pellicle Mirror by Canon
« on: November 03, 2013, 09:08:05 PM »
Please explain to me how adding a partially reflective surface into the optical path, and at an angle to boot, is going to improve image quality?

This is a bad idea. Period.


Um.. Technology Improvement?
Partially reflective surface: When light hits an object part of it is reflected, transmitted, and absorb by the object. You ask how adding an object into optical path improve image quality, isn't it longer lens got more elements on it than a prime lens, but we never question its optical transmission quality.
Similarly with this scenario, adding an high light transmittivity material wont affect image quality much. if we can possible vary the reflectivity/transmittivity of material in a high quality, then i dont see any problem.

I hope I got a point. But cheers.

12
EOS Bodies - For Stills / Re: 6D Auto-Exposures are ALL OVER the Place?!?
« on: September 29, 2013, 09:18:07 PM »
I'm not sure if you considered this.
But in indoor lighting test, make sure your shutter speed is low enough to compensate the fluctuation of the florescent or light bulb. Since electric light actually is blinking only in a fast rate our eye can not notice.

13
I end up getting the 430ex II.
The reason why I did not take 270ex ii is for off camera, last time I check no applicable wireless trigger for our 6D.
and optical trigger will not be effective for 270ex, be sensor of 270ex is in front, how am I suppose to trigger it outdoor if I get 90ex.

I recently read YN-622c now support 6D.
Too late now.
Anyway I am also happy with 430ex ii, but still too big for small occasion,
Wish 270ex can be master.

14
Hi, I refer cheap in the context that I will only use the software like 4 times a month, and I am not sure if this trend will go on.

I heard lightroom is heading to subscription version, and want to avoid this.

I have a 6D, 28mm 1.8, and recently 75-300 iii, 430ex ii. $150 software is not even yet in the list.

I am already using DPP. I was looking for a software mask and edit selectively portion of image.
That could do HDR look photo seamlessly, and non destructive one.

I will try those softwares you guy have mentioned.

15
Lighting / Re: 430EX II for £155 delivered (after rebate)
« on: June 27, 2013, 01:23:40 AM »
even my cheapo yongnou does give off a AF pattern that works well, I can't imagine everything is right with your camera. Try doing a factory reset on the camera.

Thanks for the response, it made me think for possible camera settings I've disabled.
Indeed I remember and have encountered familiar setting before,
and disable it on my 6D, thinking that 6D has a built in AF-Assist light and don't want to use it.


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