Road Train !!!!!!!!!!

by Russell McMahon

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14,310 reputation
1846
bio website j.mp/NZPHOTOS
location Auckland, New Zealand
age
visits member for 3 years
seen 6 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.


9h
comment What are the disadvantages of SLT-cameras and are they THAT bad?
.... replacement with, he said, 100% success.
9h
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 ...
10h
comment Disadvantages of electronic viewfinders?
Re "The remaining problem though for MF is lag. Just like the EVF lags action, it lags behind the focus-ring too and on some cameras I find it rather hard to get focus exactly right without back-and-forth movement." -> NB FYI only: On my Sony A77 with EVF I have never noticed manual focusing being a problem. I have high level focus peaking set "as of right". I can disable it but would probably never choose to. | Just had a play in low light conditions - focus ability not noticeably affected by EVF delay.
10h
comment What are the disadvantages of SLT-cameras and are they THAT bad?
The pellicle loss is actually ~= 1/3 of the light but ~= 1/2 of an f stop loss due to logarithmic nature of the calculation. eg 2/3 x 2/3 = 4/9 = 0.444 of original = > 1 stop so 1/3 loss is > 1/2 stop. 1/2 a stop is (1-1/sqrt2) loss = 1-0.7071 =~ 29.3% loss. The difference between 1/2 and 1/3 of a stop is almost indistinguishable to mere mortals. Even a full 1/2 stop loss is relatively minimal as it reflects not in exposure, which is the same with an equal metering in both cases, but in aperture and/or shutter speed used. eg 1/100th of a second would become 1/70th, all else being equal.
2d
comment How do I get over my shyness when taking photos of strangers?
as at August 29 2014 the 100Strangers site has been taken over by an AdServer and the waybackmachine / internet archive declines to provide past coverage. I've changed the link to a site which appears to relate - you may wish to check. Also added a Flickr photostream link for the project.
Aug
23
comment How do I handle international copyright violations?
... I I've got that wrong, my apologies, and you can of course restore the image. [Replace the x by 1 in the above link.] Even leaving the image on Imgur MAY have the sane effect but I'll leave that to you to sort out. This site has your image on it, AND they state that they got it from The NYC department of records
Aug
23
comment How do I handle international copyright violations?
I've taken the unusual step of disabling your own image BECAUSE by posting it here I understand (possibly incorrectly) that your are giving people the legal right to do exactly what you are concerned about people doing. I understand that All images posted onto this site by people who have the rights to do so assigns CC-by-SA rights to them. ie "Share — copy and redistribute the material in any medium or format. Adapt — remix, transform, and build upon the material for any purpose, even commercially. The licensor cannot revoke these freedoms as long as copiers follow the license terms
Aug
21
comment Low light photography with lens limitation
Why did you use f/22? Are you aware that that allows an extremely small amount of light into the camera compared to apertures with smaller f numbers = larger apertures?
Aug
20
comment Seeking a way for “authoritiative”, proven method to prove that two photo images are “nearly identical”?
I wouldn't worry about trying to meet SkepticsSE "standards" - they seem to work on logic systems and "standards [sic] of proof" unknown in the scientific or engineering world. Just tell them that you saw a website that said the two were the same and they'll be happy. (You may have to post them both to a site and say they are the same and give them the link if they are in rigorous mode).
Aug
18
comment Where can I find tables of common shutter speed and aperture values?
My A77 Sony offers 2 steps or 3 steps between standard power-of-two speed and aperture values. Others may offer more. You may wish to give users the ability to set the effective number of inter-stop steps which will affect the rounding.
Aug
18
comment Is there a quick fix for a DSLR which was dropped 3 feet and now won't turn on?
Affect of drops varies greatly. I dropped a Minolta 7D which has in body antishake about 1 foot onto concrete (it rolled out of a car door when I (stupidly) pulled out a long extension cord. The antishake mechanism died. | I (stupidly) dropped a Minolta 5D, also with in body antishake about 2 + feet (below elbow height) onto a bare board dance/hall floor. It was hard enough and loud enough that many people in the room made loud exclamations. It survived unscathed - maybe all the sympathy helped. Nikon will "advise you" if it has accident damage.
Aug
14
comment Capturing fast moments, such as bullet
gpuguy - Here are a collection of Doc's 'iconic images' edgerton-digital-collections.org/galleries/iconic anbd here is a subset of some "bullets and blasts" ones edgerton-digital-collections.org/galleries/iconic/bullets | If you really aspire to doing things like this you'll want to work up from easier ones, and "cheating" with "as slow as you can manage while maintaining realism" bullets will help you greatly. If you can get down to the say 300 fps range then the required 10 uS or so flash window would still be "very hard", at least.
Aug
14
comment Capturing fast moments, such as bullet
@DavidRicherby - I'll assume that you aren't just trolling and that you wrote what you did because you did not read and/or understand all of what I wrote. | Thanks for correcting my wrong name for PE. Even though your correction was also in error it brought to my attention that the correct name is "PerkinElmer" - something I'd missed.
Aug
14
comment Capturing fast moments, such as bullet
.... this Rifle Ballistics Summary Table which gives muzzle velocities for a wide range of rifles, and a link to the PerkinElmer Flash and Arc Lamps catalog which shows real world flash performance and limitations. | If @gpuguy is serious about obtaining photos like these he is probably going to have to put serious effort into obtaining bullet velocities below "the normal" and give some thought to some very special flash arrangements.
Aug
14
comment Capturing fast moments, such as bullet
@Jasmine - I'll direct this to you rather than David as his comment may be confusing. I gain the impression that he did not actually read through what I wrote. | I said "Say bullet was travelling at 100 feet per second .... so time is ~= 40 μS." And then I said "At 1000 fps that would be 4 μS. 1 μS would be even better." | (1 uS would be the required time at 4000 fps for a 1" long bullet to move 5% of its length.) |In a following comment I said "Most real world weapons achieve MVs in 1000-4000 fps range." And I provided a link to ....
Aug
14
comment How to create a ghost-like effect or shadowy figure on a photograph?
@MichaelClark - Simpler? Simpler !!!? We don't need no... er Probably :-) - I was addressing his apparent leaning towards actually have the camera do the work. Once you can add bits of light together out of the camera you have it made. My last two were towards the end of a wedding reception 'just for fun'. The rainy 2am ones just to see what I could achieve 'out of camera'. Photoshop offers a much drier warmer more predictable route :-).
Aug
13
comment Capturing fast moments, such as bullet
.... directly. You need either special gear or need to cheat in some manner. And, these photos are at the upper edge of what can be treasonably achieved. Getting some experience with eg milk drops would be a good start.
Aug
13
comment Capturing fast moments, such as bullet
@gpuguy - Questions are welcome - but they need to be based on the foundations provided by prior answers. You need to look at the material provided and understand what you are being told before you ask more questions. If you do not understand by all means ask about what has been written. The 1/24000th second was the time that the bullet would move 5% of its length given the assumptions I stated - including a VERY SLOW muzzle velocity. Read the portion I posted from the PE catalogue (it was there because it was relevant) then look at the catalog. No 'normal' camera flash will do this ....
Aug
13
comment Capturing fast moments, such as bullet
@gpuguy Bullet speed depends on load used. People accustomed to reloading bullets will be able to produce a "load" with a muzzle velocity well below what is normal for a given calibre firearm. Most real world weapons achieve MVs in 1000-4000 fps range. That's above my upper v of 1000 fps. A very light load indeed is liable to be in order - the apple will probably still die . chuckhawks.com/rifle_ballistics_table.htm
Aug
13
comment Capturing fast moments, such as bullet
@gpuguy (1) As Michael said, shutter speed is largely irrelevant. = slow enough. Maybe even "bulb". (2) Assuming that the photos is not doctored: Bullet speed should be arranged to be as slow as possible without adversely affecting the affect on the target. Say bullet was travelling at 100 feet per second. Bullet is ~~~ 1 inch long and has moved a maximum of 5% of its length - maybe less. So 1 inch x 5% / 100 feet/sec = 1/24,000 th of a second or about 40 uS. At 1000 fps that would be 4 uS. 1 uS would be even better. ....