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

by Russell McMahon

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14,320 reputation
1846
bio website j.mp/NZPHOTOS
location Auckland, New Zealand
age
visits member for 3 years
seen 1 hour 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
13
awarded  Nice Answer
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
revised Capturing fast moments, such as bullet
added 1360 characters in body
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
revised Capturing fast moments, such as bullet
added 1654 characters in body
Aug
13
answered Capturing fast moments, such as bullet
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. ....
Aug
13
revised How to create a ghost-like effect or shadowy figure on a photograph?
added 1956 characters in body
Aug
13
answered How to create a ghost-like effect or shadowy figure on a photograph?
Aug
13
revised How to create a ghost-like effect or shadowy figure on a photograph?
added 134 characters in body
Aug
10
awarded  Yearling
Aug
9
comment Are bad reviews of the Sony E 16-50mm f/3.5-5.6 pancake kit zoom reason to avoid the system?
You read the DPReview review 1st of course, didn't you? Didn't you? !!! dpreview.com/reviews/sony-alpha-a6000/13 DPR "Gold" rating.
Aug
8
answered Star photography
Aug
4
comment 50mm stuck on the body
@user1515834 .... DxO lens evaluations suggest that the MkII (Mk1 apparently not tested) is an acceptable but not stunning performer and if I owned one then say $15 plus an hour or few of fun would probably be worth expending in this manner. Each to their own.
Aug
4
comment 50mm stuck on the body
@user1515834 It's a shame that Canon reduced quality below an acceptable level in this manner. BUT note that the replacement plate that HackinGuiy identified for $US9.99 is made of metal (probably due to the failures) and is likely not to fail in the same way. It looks like it MAY be worthwhile for owners of these lenses to change or modify the bases plate prior to failures occurring. ....
Aug
3
revised Sony 3.5-5.6/18-55 SAM (SAL1855) lens broken
added 418 characters in body
Aug
3
revised Sony 3.5-5.6/18-55 SAM (SAL1855) lens broken
added 418 characters in body
Aug
3
answered Sony 3.5-5.6/18-55 SAM (SAL1855) lens broken
Aug
2
comment Portable battery charger
@Rene "no need" and "would be exceedingly useful" vary. Ability to charge from USB port on a netbook can be very handy. Charging from a power bank can be life saving. Depend son how portable you need or want.