Alley in Pisa, Italy

by Lars Kotthoff

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13,920 reputation
1644
bio website j.mp/NZPHOTOS
location Auckland, New Zealand
age
visits member for 2 years, 11 months
seen Jul 22 at 11:28

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.


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
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
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
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.
May
15
comment Is it necessary to fully drain Ni-MH batteries before recharging them?
@Lu'u Vinh Phuc - the quoted Wikipedia reference is 'rather old' [2002] but there are some modern sources which discuss related effects. See my updated answer.
Apr
20
comment Night photo with Leica 25mm: blur at f/1.4
(1) Shine light on subject at left. Use spot centre focus or an off centre focus point to focus. Recompose photo while maintaining focus setting. Light off. Go. or (2) Set focus manually to match target (usually very hard at f/1.x)
Apr
19
comment What kind of lighting do I need for a halo portrait?
One aspect only: If you are trying to do this 'in the field' with minimal equipment then fill flash will help to independently control face brightness. Relative flash to ambient exposure can often be selected but range may not be enough. Flash set to manual allows more range. You can add a diffuser to flash if necessary to get even less light.
Apr
18
comment How do popular free RAW editor/converter compare to each other on Windows?
FWIW free Irfanview does RAW conversion.
Apr
11
comment What Will Make Me Buy the D800 over DF if the former is cheaper?
DF/D800: No video/video.| DF has best low light performance of any 35mm camera ever sold. Unlike the D600/D800 the actual sensor noise per pixel is lower than for a D700. BUT many other factors too.
Mar
3
comment How can I get the top people of a camera brand to listen to a design idea I have?
@ClaraOnager - I'll admit to being quietly amazed at your comment about the sheer level of comments "showing the badness". Did you READ the comments? Yes, there are numerous negative ones - (one person went to every answer and made comment to help keep the -ve count up :-) ) , but there also many useful ones which have helped me substantially and which will help some other people too. I think all the answers are useful and there are 40+ upvotes on them as I write this. Apparently your expectations of a 10k user (or 13k6 fwiw :-) ) is not quite the same as everyone else's.
Mar
2
comment How can I get the top people of a camera brand to listen to a design idea I have?
Update: Pretty sad really. I see the downvotes slowly growing. And this has been a very worthwhile exercise for me. And ultimately will quite likely be useful for others. But it is slowly going +3/-4, +3/-5 ... and soon enough it will die. Which is sad as WHILE the various comments have been valuable and useful and largely enough correct AND have added some guidance, they have not reflected reality as I have managed to experience it. I think :-). Hearing the whole story when it can be told better is likely to be of use to others, but, by then it will probably be gone. A loss to others.
Feb
28
comment How can I get the top people of a camera brand to listen to a design idea I have?
I seem to have obtained the access I desired - now I just need to present it succinctly and cogently and we'll see how it goes. I'm in the midst of writing it up 'formally' but had an occasion to outline it informally "off the cuff" in private to a friend and saw how badly I can manage to summarise it without much effort. So, care required, but ...
Feb
28
comment How can I get the top people of a camera brand to listen to a design idea I have?
I do 'like' the way jwenting has gone around many of the answers dropping in the same negative comment in slightly altered form. More into will be provided when it's 'safe' to do so.
Feb
28
comment How can I get the top people of a camera brand to listen to a design idea I have?
... ignoring the many peripheral ones. I "invented" the Sony SLT on paper in 2003 after buying a superb Minolta 7Hi and realising where SLRs would go. It took Sony a few more years to buy Minolta and follow me :-). I watch camera interfaces and note how people are thrashing around to and from without making quantum leaps in control methodology. The time has come :-). The way the world works is the best I will achieve is to point to this thread and say that I almost managed to be 1st. No prize for2nd.
Feb
28
comment How can I get the top people of a camera brand to listen to a design idea I have?
@jwenting - Twice? Dozens of times :-). The drier was obvious but useful. I didn't have internet search then. I Ps the rocket pump so did not seek to gain from it. That my "wheel" was essentially in tie sync with Macdonnell Douglas leaves a fairly good feeling. I saw (really stupid) a loophole in their patent that would allow me to bypass it totally - not of interest. | BUT I started with a Box Brownie 50 years ago :-). I bought an SRT303B thereby more or less welding myself decades later to Sony (due to A mount lenses - as happens). I've had about 9 digital cameras in a row ....