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by damned truths

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14,732 reputation
1849
bio website j.mp/NZPHOTOS
location Auckland, New Zealand
age
visits member for 3 years, 4 months
seen 14 mins ago

Electronic designer. Professional Engineer. Oldish aka "reasonably experienced" :-).
Contact - apptechnz gmail com <- you know the drill.
Tel: +64 9 837 2999 gmt+13

Special interest in technological solutions for developing country applications. Extensive in-China experience in product development & manufacturing in China.

Jack of all trades, Master of Electrical engineering. (aka ME (elec)) Interested in all aspects of modern technology. Professional qualifications in electrical engineering but practically proficient or conversant in many peripheral areas.

Recent extensive experience in solar powered LED lighting development and manufacturing in China for markets worldwide.

"Servant of the Most High God" / committed Christian. Happy to work enthusiastically and interact amicably with people of all nationalities and creeds.

Married with 2 adult children.

Obsessional photographer.


Sep
17
comment Problem in white balancing photographs taken in sun
... (And, yes, I know we often do want to). Light at various colour temperature may fall on the black body/ Plankian locus and therefore be "white" but there is white and there is white. As I know we all know.
Sep
17
comment Problem in white balancing photographs taken in sun
" ... eyes and brain tuned ...". It can be argued that the actual colour changes when the irradiating source changes, as the response of the various target components to various wavelengths change. When we try to "colour balance" the image we are attempting to make it look as it would with illuminated with a standard source ("tungsten incandescent") and in fact if we look at the scene at the time the photo was taken it does not look to our eye as it would if we illuminated it with tungsten. Why should we be able to or want to modify the image in ways which do not represent reality. ...
Sep
14
answered How to get long hair to fan?
Sep
14
comment Where does the price premium of full-frame come from?
"Because they can" is a significant factor.
Sep
8
revised Can studio light be as good as sunlight?
added 1734 characters in body
Sep
7
answered Can studio light be as good as sunlight?
Sep
7
comment What to look for in a compact camera to take picture of black dog?
Photos of black-dog? Very depressing. [ :-) ].
Sep
5
comment Does camera calibration negate lens color quality?
You can wreck anything if you try hard enough but the attributes of a lens will to some extent be visible for sensible 'calibration".
Sep
5
comment What are the disadvantages of SLT-cameras and are they THAT bad?
In Menu item *2 / Live view display/ Setting Effect [on/off] try Off. This MAY help somewhat. When on the EVF tracks WYSIWYG alterations for eg White Balance May help with brightness level. More desperate but useful is to wind exposure compensation up - a max of 5 EVs. THEN store the correct setting to say memory 1 and bright setting to memory 2. Leave LH rotary selector on MR. To change memories rotate selector 1 click one way and back, select one step right or left for desired memory with rear thumbwheel and press selector centre button. Takes very little time indeed once burned into brain.
Sep
4
comment Hour long exposure of the sun
Random thought only. An intermittent super slow external shutter would allow a lower ND ratio and would at least change parameters which may (or may not) help. eg a 1s on 15s off wheel or sliding mask or ...? would be easyish to implement and should be "easily enough" made to leave no significant artefacts over the time concerned.
Sep
2
revised How should I approach people to take their portrait?
added 6 characters in body
Sep
2
revised How should I approach people to take their portrait?
deleted 4 characters in body
Aug
31
revised What are the disadvantages of SLT-cameras and are they THAT bad?
deination -> designation
Aug
31
comment What are the disadvantages of SLT-cameras and are they THAT bad?
@AndreasHartmann - Yes. Quality varies. If buying in my country I ask if there is a warranty - usually there is even on an auction site - but I've had good luck and all have lasted acceptably well. If buying from or in China in small volume its pot luck. I bought a number in Hong Kong (for A200 or A700) and they were all acceptable.
Aug
31
comment Generic battery advice for Sony's NP-FW50
It would have if they were but they won't be so it hasn't :-). The stated voltage is an approximation to the average for 2 LiIon cells in series and both are close enough to correct to be unimportant.
Aug
31
revised Generic battery advice for Sony's NP-FW50
added 709 characters in body
Aug
31
revised Generic battery advice for Sony's NP-FW50
added 864 characters in body
Aug
31
answered Generic battery advice for Sony's NP-FW50
Aug
30
comment What are the disadvantages of SLT-cameras and are they THAT bad?
.... replacement with, he said, 100% success.
Aug
30
comment What are the disadvantages of SLT-cameras and are they THAT bad?
Hugo - Sorry if I seemed to be criticising - I've had various people misunderstand the 1/3 light vs 1/2 stop claim and thought I'd spell it out so people knew what I was saying. Actual loss is a little hard to come by formally - but here is a site by a man who seems to know his stuff which **measures mirror loss and examines mirror distortion‌​. He says the mirror gives 1/2 f stop and also causes noticeable quality degradation. Examples shown with and without mirror. I've read of someone using plastic wrap as a mirror ...