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A Few Shots From South Africa



 
 
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  #21  
Old February 28th 18, 05:41 PM posted to rec.photo.digital
android
external usenet poster
 
Posts: 3,854
Default A Few Shots From South Africa

On 2018-02-28 16:28:50 +0000, Whisky-dave said:

On Wednesday, 28 February 2018 13:04:46 UTC, android wrote:
On 2018-02-28 11:05:36 +0000, Whisky-dave said:

On Wednesday, 28 February 2018 08:42:03 UTC, android wrote:
On 2018-02-28 07:38:14 +0000, Savageduck said:

android wrote:
On 2018-02-28 07:05:05 +0000, Savageduck said:

android wrote:
On 2018-02-28 04:49:03 +0000, Savageduck said:

m-m wrote:
In article ,
RichA wrote:

On Friday, 23 February 2018 13:07:20 UTC-5, Savageduck wrote:

I like the shots, the colour is well-saturated. In my opinion, my favorite
is the boats and hillside shot because the hillside and boats kind of fuse to
make one geometric triangle that dominates the shot.

Yes but the boats all have a blue hue from the sea and sky reflections,
if I'm referring to the same one as you:

https://www.dropbox.com/s/97rkfdp242k3eb6/_DSF0302.jpg

Surely this can be corrected post-processing


I have to agree, the boats do seem to be a bit too blue. As I have said
elsewhere in the thread, I am still on the road in South Africa, and I
pretty much posted quick edits using my iPad. That said, here is another
rendition with a selective temp adjustment to the boats.

https://www.dropbox.com/s/i3pv4venzqa88iz/_DSF0302e1.jpg

You haven't got that vacation thing down right!

https://www.youtube.com/watch?v=LwiIYoJx5Es

Not exactly. ;-)

With 10 hours difference between California, and Cape Town, I find myself
awake at odd times. So what is a guy with a camera, and WiFi connection to
do?

Cruse? Geting that Southern Cross on file? I've got to understand that
the opportunities for astro are amazing in southern Africa. :-))

The place to go to get the best, clear night Southern sky shots would be
about 150 miles ( 242km) North of Cape Town at Sutherland. That is also
where SALT, the South African Large Telescope (the largest in the Southern
hemisphere), and the South African Astronomical Observatory are located.

https://goo.gl/images/DrHiwx

Sure, happy days! Spectrography is very interesting... The real Hubble
killer would be this one though:

https://en.wikipedia.org/wiki/European_Southern_Observatory#Very_Large_Telescope



--
teleportation kills

Until the James Webb Space Telescope comes online in 2019.


Then it will be a Hubble killer still! "The VLTI can achieve an angular
resolution of milliarcseconds, equivalent to the ability to see the
headlights of a car on the moon." :-))


But there aren't any car headlights on the moon to see ;-P

--
teleportation kills


And you know that how? Things change you know...
--
teleportation kills

  #22  
Old March 1st 18, 12:17 PM posted to rec.photo.digital
-hh
external usenet poster
 
Posts: 710
Default A Few Shots From South Africa

On Thursday, March 1, 2018 at 5:33:38 AM UTC-5, Whisky-dave wrote:
On Wednesday, 28 February 2018 16:41:12 UTC, android wrote:
On 2018-02-28 16:28:50 +0000, Whisky-dave said:

On Wednesday, 28 February 2018 13:04:46 UTC, android wrote:
On 2018-02-28 11:05:36 +0000, Whisky-dave said:

On Wednesday, 28 February 2018 08:42:03 UTC, android wrote:
On 2018-02-28 07:38:14 +0000, Savageduck said:

android wrote:
On 2018-02-28 07:05:05 +0000, Savageduck said:

android wrote:
On 2018-02-28 04:49:03 +0000, Savageduck said:

m-m wrote:
In article ,
RichA wrote:

On Friday, 23 February 2018 13:07:20 UTC-5, Savageduck wrote:

I like the shots, the colour is well-saturated. In my opinion, my favorite
is the boats and hillside shot because the hillside and boats kind of fuse to
make one geometric triangle that dominates the shot.

Yes but the boats all have a blue hue from the sea and sky reflections,
if I'm referring to the same one as you:

https://www.dropbox.com/s/97rkfdp242k3eb6/_DSF0302.jpg

Surely this can be corrected post-processing


I have to agree, the boats do seem to be a bit too blue. As I have said
elsewhere in the thread, I am still on the road in South Africa, and I
pretty much posted quick edits using my iPad. That said, here is another
rendition with a selective temp adjustment to the boats.

https://www.dropbox.com/s/i3pv4venzqa88iz/_DSF0302e1.jpg

You haven't got that vacation thing down right!

https://www.youtube.com/watch?v=LwiIYoJx5Es

Not exactly. ;-)

With 10 hours difference between California, and Cape Town, I find myself
awake at odd times. So what is a guy with a camera, and WiFi connection to
do?

Cruse? Geting that Southern Cross on file? I've got to understand that
the opportunities for astro are amazing in southern Africa. :-))

The place to go to get the best, clear night Southern sky shots would be
about 150 miles ( 242km) North of Cape Town at Sutherland. That is also
where SALT, the South African Large Telescope (the largest in the Southern
hemisphere), and the South African Astronomical Observatory are located.

https://goo.gl/images/DrHiwx

Sure, happy days! Spectrography is very interesting... The real Hubble
killer would be this one though:

https://en.wikipedia.org/wiki/European_Southern_Observatory#Very_Large_Telescope



--
teleportation kills

Until the James Webb Space Telescope comes online in 2019.

Then it will be a Hubble killer still! "The VLTI can achieve an angular
resolution of milliarcseconds, equivalent to the ability to see the
headlights of a car on the moon." :-))

But there aren't any car headlights on the moon to see ;-P

--
teleportation kills


And you know that how? Things change you know...
--
teleportation kills


Can you tell me which apollo mission (or any other) that took car headlights to the moon. ?


Actually, they did take a corner reflector up there (at least once), so headlights on Earth which happen to shine light that way would have a direct path reflected back to Earth.


-hh
  #23  
Old March 1st 18, 01:12 PM posted to rec.photo.digital
android
external usenet poster
 
Posts: 3,854
Default A Few Shots From South Africa

On 2018-03-01 10:33:26 +0000, Whisky-dave said:

On Wednesday, 28 February 2018 16:41:12 UTC, android wrote:
On 2018-02-28 16:28:50 +0000, Whisky-dave said:

On Wednesday, 28 February 2018 13:04:46 UTC, android wrote:
On 2018-02-28 11:05:36 +0000, Whisky-dave said:

On Wednesday, 28 February 2018 08:42:03 UTC, android wrote:
On 2018-02-28 07:38:14 +0000, Savageduck said:

android wrote:
On 2018-02-28 07:05:05 +0000, Savageduck said:

android wrote:
On 2018-02-28 04:49:03 +0000, Savageduck said:

m-m wrote:
In article ,
RichA wrote:

On Friday, 23 February 2018 13:07:20 UTC-5, Savageduck wrote:

I like the shots, the colour is well-saturated. In my opinion, my favorite
is the boats and hillside shot because the hillside and boats kind of fuse to
make one geometric triangle that dominates the shot.

Yes but the boats all have a blue hue from the sea and sky reflections,
if I'm referring to the same one as you:

https://www.dropbox.com/s/97rkfdp242k3eb6/_DSF0302.jpg

Surely this can be corrected post-processing


I have to agree, the boats do seem to be a bit too blue. As I have said
elsewhere in the thread, I am still on the road in South Africa, and I
pretty much posted quick edits using my iPad. That said, here is another
rendition with a selective temp adjustment to the boats.

https://www.dropbox.com/s/i3pv4venzqa88iz/_DSF0302e1.jpg

You haven't got that vacation thing down right!

https://www.youtube.com/watch?v=LwiIYoJx5Es

Not exactly. ;-)

With 10 hours difference between California, and Cape Town, I find myself
awake at odd times. So what is a guy with a camera, and WiFi connection to
do?

Cruse? Geting that Southern Cross on file? I've got to understand that
the opportunities for astro are amazing in southern Africa. :-))

The place to go to get the best, clear night Southern sky shots would be
about 150 miles ( 242km) North of Cape Town at Sutherland. That is also
where SALT, the South African Large Telescope (the largest in the Southern
hemisphere), and the South African Astronomical Observatory are located.

https://goo.gl/images/DrHiwx

Sure, happy days! Spectrography is very interesting... The real Hubble
killer would be this one though:

https://en.wikipedia.org/wiki/European_Southern_Observatory#Very_Large_Telescope




--
teleportation kills

Until the James Webb Space Telescope comes online in 2019.

Then it will be a Hubble killer still! "The VLTI can achieve an angular
resolution of milliarcseconds, equivalent to the ability to see the
headlights of a car on the moon." :-))

But there aren't any car headlights on the moon to see ;-P

--
teleportation kills


And you know that how? Things change you know...
--
teleportation kills


Can you tell me which apollo mission (or any other) that took car
headlights to the moon. ?


None. But the lunatics seem to get out of their caves elsewhere...

I'll be moving a few blocks while my flat, and its building gets a well
needed makeover and will thus be off line for some time...
--
teleportation kills

  #24  
Old March 1st 18, 02:47 PM posted to rec.photo.digital
-hh
external usenet poster
 
Posts: 710
Default A Few Shots From South Africa

On Thursday, March 1, 2018 at 7:19:12 AM UTC-5, Whisky-dave wrote:
On Thursday, 1 March 2018 11:17:52 UTC, -hh wrote:
On Thursday, March 1, 2018 at 5:33:38 AM UTC-5, Whisky-dave wrote:
[...]
Can you tell me which apollo mission (or any other) that
took car headlights to the moon. ?


Actually, they did take a corner reflector up there (at least once),
so headlights on Earth which happen to shine light that way would
have a direct path reflected back to Earth.


There's no headlight on earth that could do that, what they left
there was for a laser to be shone to measure the distance to the
moon oer time.


True, it was for a laser (which is light), but it was also designed
in the 1960s using 1960s technology for the receive sensor.

There;s no way a headlamp would be bright enough or be able to
produce a beam bright enough to reach the moon and reflect back,
it's difficult enough with a high power laser who beam only reflects
back a very small amount of light in fact the reflected light is
too weak to see with the human eye.


Human eye? Oh, sorry: I thought this was about the ability of a
machine (Hubble's replacement) to have adequate senor resolution.

Out of 10^17 photons aimed at the reflector, ...


which is another way of saying ~0.25 Joules worth...

only one is received back on Earth every few seconds, even under
good conditions.


Sure, but that's at the power level you specified.

In contrast, Class4 laser today (minimum of 500mW) sell for as
little as $100 today, and 2W & 5W versions are pretty commonplace
(and why they're such a safety threat to aviation).

Case in point, here's a 10W green Class4 for only $250:

http://www.everyonetobuy.com/green-10000mw-burning-laser-pointer-pen.html

....that's 20x the power level you picked, and its an off-the-shelf
commercial product.

Plus we can similarly look at the sensor side, to see how much that
technology to detect the return signal has improved over the last
50 years...

Case in point: Nikon D5 goes up to ISO 3,280,000, which has 15x
the light sensitivity of classical old ISO 100 film.


-hh
  #25  
Old March 1st 18, 05:43 PM posted to rec.photo.digital
nospam
external usenet poster
 
Posts: 22,122
Default A Few Shots From South Africa

In article ,
Whisky-dave wrote:

In contrast, Class4 laser today (minimum of 500mW) sell for as
little as $100 today, and 2W & 5W versions are pretty commonplace
(and why they're such a safety threat to aviation).


Yes well aircraft don't fly at the same distance from the earth as the moon
orbits.


elon musk's tesla goes much further than that.
  #26  
Old March 1st 18, 06:14 PM posted to rec.photo.digital
-hh
external usenet poster
 
Posts: 710
Default A Few Shots From South Africa

On Thursday, March 1, 2018 at 11:34:10 AM UTC-5, Whisky-dave wrote:
On Thursday, 1 March 2018 13:47:41 UTC, -hh wrote:
On Thursday, March 1, 2018 at 7:19:12 AM UTC-5, Whisky-dave wrote:
On Thursday, 1 March 2018 11:17:52 UTC, -hh wrote:
On Thursday, March 1, 2018 at 5:33:38 AM UTC-5, Whisky-dave wrote:
[...]
Can you tell me which apollo mission (or any other) that
took car headlights to the moon. ?

Actually, they did take a corner reflector up there (at least once),
so headlights on Earth which happen to shine light that way would
have a direct path reflected back to Earth.

There's no headlight on earth that could do that, what they left
there was for a laser to be shone to measure the distance to the
moon oer time.


True, it was for a laser (which is light), but it was also designed
in the 1960s using 1960s technology for the receive sensor.


The apollos were 1960s technology too, well most that went to the moon were.


True, and as such, the only relevant technology question that this
poses is to what degree the technology has changed in the fabrication
of pentaprisms for the retroreflectors. Simple answer there is that
it relies on mechanical geometry (and optical quality) which certainly
has improved over the past 50 years, but not by orders of magnitude.


There;s no way a headlamp would be bright enough or be able to
produce a beam bright enough to reach the moon and reflect back,
it's difficult enough with a high power laser who beam only reflects
back a very small amount of light in fact the reflected light is
too weak to see with the human eye.


Human eye? Oh, sorry: I thought this was about the ability of a
machine (Hubble's replacement) to have adequate senor resolution.


It does but it still won't see headlamps on the moon any more than
it'll find the Spaghetti mosnster on the moon.


Except for how the whole "headlight on the moon" was simply a layman's
explanation of how much better the replacement is over Hubble.


Out of 10^17 photons aimed at the reflector, ...


which is another way of saying ~0.25 Joules worth...


so not a lot then.


Depends on context. Here, the context is in raising the
power on a terrestrial transmitter to go do something.


only one is received back on Earth every few seconds,
even under good conditions.


Sure, but that's at the power level you specified.


A power much higher than the aveage car headlight.


There's been mere automotive headlights for sale that
are in the 100-200 Watt range for decades, and for a
good halogen, figure 35lumens per watt...or use a HID
because their conversion efficiency is ~twice that.

Similarly, I still own a couple of old camera strobes
whose outputs were 200 Watt-seconds, which when you
consider the short time duration of a strobe means that
their peak output was easily 20 kJ (@ 10msec) if not
more (100 kJ @ 2msec). True, this isn't narrow beam
focused like a laser, but more of that's an optics
based divergence question.


In contrast, Class4 laser today (minimum of 500mW) sell for as
little as $100 today, and 2W & 5W versions are pretty commonplace
(and why they're such a safety threat to aviation).


Yes well aircraft don't fly at the same distance from the
earth as the moon orbits.


Considering that 99% of that distance has no atmosphere for signal
attenuation, the distance only matters from the perspective of the
optical path's divergence angle.


Case in point, here's a 10W green Class4 for only $250:


I bet they can;t get that to reflect off something on the moon,
and I bet such a laser if on the moon couldn;t be seen from earth.


Oh, it will definitely reflect ... that's basic physics. The
question is if you have a good enough sensor technology to detect
(reliably) the return signal. Point is that our sensor tech is a
lot better today than it was back in 1969.


http://www.everyonetobuy.com/green-10000mw-burning-laser-pointer-pen.html

...that's 20x the power level you picked, and its an off-the-shelf
commercial product.


I didnl;t piuck any power level and it;s not really the power
that is all important, at the distance the moon is the small beam
would be about 5 metres in diameter, spreading the light out.


The light still gets there, and that which isn't absorbed will be
reflected, some of which back in the direction of Earth. And because
atmospheric attenuation also isn't 100.0%, some *will* get through
to where it could be detected, given a good enough detector. That's
all basic & immutable physics.


Plus we can similarly look at the sensor side, to see how much that
technology to detect the return signal has improved over the last
50 years...


and how much the reflector has deterioded over that time.


Yes, there's been some deterioration that has been detected, but
that a performance shift has been detected is also illustrating
that contemporary sensor tech is better today than in decades past.


Case in point: Nikon D5 goes up to ISO 3,280,000, which has 15x
the light sensitivity of classical old ISO 100 film.


So, it still won't be able to see the laser beam.


Can't make that determination for sure without more literature research,
but it is a damn safe bet that that modern sensor is more sensitive than
what they were originally using back in 1969.


-hh
  #27  
Old March 2nd 18, 10:44 PM posted to rec.photo.digital
Diesel
external usenet poster
 
Posts: 345
Default A Few Shots From South Africa

"David B."
Fri, 23 Feb 2018 23:59:14 GMT
in rec.photo.digital, wrote:

On 23/02/2018 18:07, Savageduck wrote:
I had an opportunity to do some shooting today, so here are a few
via my iPad. Included are some panos. All adjustments were made
with LR CC Mobile. All shots have been resized to deal with local
bandwidth conditions.

https://www.dropbox.com/s/jqmgmu7x7tpzoig/_DSF0281.jpg

https://www.dropbox.com/s/jurglhfl9blq5ac/_DSF0285.jpg

https://www.dropbox.com/s/97rkfdp242k3eb6/_DSF0302.jpg

https://www.dropbox.com/s/acq0k1i5kvbxxwv/_DSF0313.jpg

https://www.dropbox.com/s/ayixpe2xvfx1zo7/_DSF0328.jpg

https://www.dropbox.com/s/rqyevtknz5i597v/_DSF0330.jpg

The Panos:
https://www.dropbox.com/s/3kpsagw46i0v56p/_DSF0300.jpg

https://www.dropbox.com/s/4wq87ifze6xpixo/_DSF0332b.jpg


All good!

Thanks for sharing! :-)


You should issue him an apology for previous threat of doxing, David.
And do keep in mind, he didn't give you permission to copy his
pictures and upload them elsewhere. See if you can honor that.


--
Don't become the next David Brooks cyberstalking victim!
Visit https://tekrider.net/pages/david-brooks-stalker.php (10/10 WOT)
to learn more. If you've already become a victim or know someone who
has, you can provide the following information to them, your lawyer,
local law enforcement, etc.
https://www.devon-cornwall.police.uk - His local police. Report?
David Brooks (BoaterDave)
Jersey Cottage 86 Granary Lane
Budleigh Salterton Devon EX9 6ER United Kingdom
Phone: 44-1395-443340 (H) 07974-193550 (M)
Email(s): ,
 




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