Paris

by Jon

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14,435 reputation
1846
bio website j.mp/NZPHOTOS
location Auckland, New Zealand
age
visits member for 3 years, 1 month
seen 4 hours 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.


Aug
2
answered 50mm stuck on the body
Aug
1
comment Portable battery charger
@Rene see my answer - apart from size and weight, I'd say a mains only charger is not "portable" in the sense I'd use the term in a camera context. A mains powered charger that uses a 12V DC plugpack (wall wart) allows in-car use. A charger that can use 5V "USB" input would allows USB voltage "battery bank" powering and true portable charging. In this case it's LiIon charging LiIon with a little help from its friends, which could be a very useful facility. The ability to charge camera batteries during a long shooting day or a long trip gives added confidence.
Aug
1
comment Portable battery charger
@ElendilTheTall I have steered my answer towards being applicable to anyone wanting a portable charger. Hopefully that is actually useful.
Aug
1
answered Portable battery charger
Jul
31
revised Can anyone identify the manufacturer of this golden lens?
added 93 characters in body
Jul
31
answered How to share large number of photos for review by family, with comments saved with the pictures?
Jul
18
answered If I'm using only one focus point, am I doing it wrong?
Jul
16
awarded  Notable Question
Jun
1
comment Why doesn't an f/1.8 lens result in a lower ISO than an f/2.8 lens?
PLUS - your two images do NOT have identical exposures. This MAY be caused by condensing actions taken by you but, as presented, the light levels in the same locations in the two images vary eg around the street lights = and probably in many other places as well. Your comparisons must be more controlled to be useful.
Jun
1
comment Why doesn't an f/1.8 lens result in a lower ISO than an f/2.8 lens?
(1) To rephrase part of your question as an answer - "What is the advantage of an expensive quality camera if you use it in auto mode in demanding situations - you are wasting hundreds of dollars." (2) For equal exposure something has to change - if ISO did not then shutter speed must. Why did you not advise shutter speeds when they are an absolutely vital part of exposure calculations? || An f/1.8 lens allows (2.8/1.8)^2 =~ 2.4 x as much light in more light in than a f/2.8 lens does, all else being equal. Better than 1 stop. And that is not the sole reason to buy an f/1.8.
May
28
comment Does street photography including children introduce any specific concern?
@Jasmine - Thanks for the comments. See addition to my answer.
May
28
revised Does street photography including children introduce any specific concern?
added 2786 characters in body
May
25
comment Human perception in color mixing
Zooming in and out in discrete steps changed the appearance completely at different zoom ratios. My brain or the video card were experiencing major illusions. || Related: If you take a CIE1931 colour chart you can VERY APPROXIMATELY draw a line between two colour on the chart and establish a position along the line based on the inverses of their amplitudes and arrive at a something like the colour you would see. So you can do eg Yellow phosphor + Blue LED summing and get some idea of the colour and of how it would change as the components change. ...
May
24
comment Lenses for India trip on a Canon 7D
I would personally find that limited range of focal lengths immensely restrictive. I recently spent 3 weeks in India "photographing everything" . I'd recommend the widest range zoom that your $ & weight budget will tolerate. And if another 500 grams or so could not be managed I'b be looking at discarding something less important such as food or half my clothing. India is a massively complex place with an immense wealth of photographic subject material at every turn. To miss out on superb shots in exchange for eg lower weight would be most sad.
May
23
accepted What is the minimum cost “automatic” flash that I can sensibly use with a Nikon D700
May
18
comment Do Left and Right matter in how the photo is perceived?
Related but different. I recently posted a composite photo of two images on facebook. Given two images A & B I could have placed them AB or BA. The time flow was from A to B suggesting arrangement AB but B was taken spatially just to the left of A so the spatial ordering was BA. I chose BA. || A cute sequence, and also a comment on photographers :-) . Almost worth a click.
May
17
comment How much do lens lineups vary across DSLR platforms?
Sony has the only AF Reflex (mirror) lens. Also, Sony can use all Minolta lenses (although finding any of then new may be a bit of an ask :-) ).
May
15
answered Steel wool photography: how to obtain lots of sparks?
May
15
comment Do Left and Right matter in how the photo is perceived?
I on occasion flip my images left for right to see what difference makes. To me the perceived difference can be substantial, and sometimes surprisingly so, but there is no guarantee that others perceive the same difference.
May
15
comment Do Left and Right matter in how the photo is perceived?
Does this mean that photos targeted at top to bottom script users should have people lying face down if peaceful and face up to indicate tension. And the opposite for BTT text users? [·] <- non printing smiley character.