POPSCI Article:
"...The White House also wants NASA to focus more attention on climate
change research and monitoring and developing programs enabling future
exploration of asteroids and the inner solar system"
http://www.popsci.com/technology/article/2010-01/rumor-obama-budget-slash-funds-
Hello List,
If anyone is not able to make it to the show and is interested a nice
10 gram Buzzard Coulee Individual I just listed one on ebay.
There is also a 4.3 gram Buzzard ebay auction that ends in 6 hours.
Many Thanks,
Mark Murphy
IMCA# 6216
_
this what is possible take with a Zeiss Luminar 16 mm
http://www.mindat.org/photo-274787.html
http://www.mindat.org/photo-268445.html
just two examples
Matteo
>
> Matteo, dont mention Zeiss lenses. I'll burst with
> jealousy! You are spoiled!
>
> [Erik]
>
M come Meteorite Meteoriti
AL & John- More depth of field at higher F-stops yes, but you loose sharpness
with each f-stop. Therfore, combining a series of F2.8 shots into one picture
will be sharper then shooting at F22. This is proven and published in several
canon and nikon articles. Especially when you have a 10-24
Franconia irons (Sacremento Wash 005) often have copper in them.
> Date: Wed, 27 Jan 2010 16:14:46 -0800
> From: star_wars_collec...@yahoo.com
> To: meteorite-list@meteoritecentral.com
> Subject: [meteorite-list] Copper found in meteorite
>
> While I am
Yes it will, because GE expects the input to be Latitude, Longitude and Rob has
presented them as Longitude, Latitude.
Reverse his numbers and it will work correctly.
--
Richard Kowalski
http://fullmoonphotography.net
IMCA #1081
--- On Wed, 1/27/10, Shawn Alan wrote:
> From: Shawn Alan
> Su
Sounds like you swapped the latitudes and longitudes. A latitude of -77 will
place you nicely inside Antarctica regardless of the longitude.
Chris
*
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
- Original Message -
From: "Sha
Rob and Listers,
When I put these coordinates in from the new estimated impact predictions for
the Lortan meteorite in google maps, the new impact sites are in Antarctica. Am
I doing something wrong or is there a number off in the coordinates that's
giving me a wrong location?
Shawn Alan
Mass
To restate what Chris pointed out as the optical law: diffraction
effects begin as soon as you stop the lens down. A perfect lens would be
sharpest across the field of view and in the plane of focus at its
widest aperture. There are no consumer grade perfect lenses so some
diffraction worsenin
Great looking web site Sonny!
Regards,
Michael Johnson
http://www.rocksfromspace.org
- Original Message -
From: wahlpe...@aol.com
To: meteorite-list@meteoritecentral.com
Sent: Wed, 27 Jan 2010 15:53:50 -0800 (PST)
Subject: [meteorite-list] NevadaMeteorites.com my new web page is up and ru
Hello, Copper is in the Tucson Iron visible with the naked eye. Also reported
in West TX. and many many more. Carl
--
Carl or Debbie Esparza
Meteoritemax
Frank Cressy wrote:
> Hello all,
>
> Thought I'd add that the first occurrance of elemental copper was found in
> the Richardson (Nor
Hello all,
Thought I'd add that the first occurrance of elemental copper was found in the
Richardson (North Dakota) fall of 1918. It is noted in a paper by Quirke in
1919.
Cheers,
Frank
- Original Message
From: Greg Catterton
To: Mark Bowling
Cc: meteorite-list@meteoritecentral.
This was just a nice looking 165g NWA stone I decided to cut open.
I found it had some really nice inclusions and offered it for testing.
I have been posting updates as testing has been progressing.
I actually have 2 complete slices of this material currently listed on ebay
(not trying to really
Cool Greg,
That was just a random NWA? I thought I heard that Franconia has copper. As a
copper miner, I would love to have a small specimen with some copper, visible
or otherwise (hand specimen or thin section). So any of you who know where I
could secure something like that, please let me
Hi Greg, Sonny and List,
I agree, awesome site Sonny. It's first class, just like you. :)
Best regards and happy hunting,
MikeG
On 1/27/10, Greg Stanley wrote:
>
> Sonny:
>
> Very nice website; I really like all the pictures and the stories.
> Congratulations on the CM1 find... truly amazing.
While I am sure this is more common then I have been able to find out about, it
surely is not something that you see everyday.
We found several areas in an NWA (the one with nice inclusions) that has copper
present.
Here is a picture of one of them, enjoy.
http://i27.photobucket.com/albums/c165
Sonny:
Very nice website; I really like all the pictures and the stories.
Congratulations on the CM1 find... truly amazing... what a stone. Beautiful
dog you have as well.
Greg S.
> To: meteorite-list@meteoritecentral.com
> Date: Wed, 27 Jan 2010 18:
This sucks Eric. I will try it later tonight and report back the results.
I'm not sure, but I think I have the most friends of any meteorite
person on Facebook, so I have to be extra careful about my account.
With over 1500 friends, I am extra cautious - I do not click on any
external links, peri
Very Cool Sonny! Great job on the site!
Regards,
Eric
On 1/27/2010 3:53 PM, wahlpe...@aol.com wrote:
Hi List,
I have been working on a new web page. The web page has photographs of
many of my new finds including Moapa Valley, the first CM1 ever found
in the United States and only the seco
UPDATE: It's worse than I thought.. I got my account back, and
everything seemed great until... Until I tried to post a link to my
Lorton Meteorite Fall page.
Those of you who are one Facebook please do me a favor and try to post a
link to my Lorton Meteorite Fall page and see if you get the s
Just to put a quantitative spin on this, the physical size of the Airy disc
(the diffraction spot produced by a point source) is directly related to
focal ratio. Any lens at f/22 will produce a diffraction spot 27 um in
diameter. Any lens at f/8 will produce a diffraction spot 11 um in diameter.
Hi List,
I have been working on a new web page. The web page has photographs of
many of my new finds including Moapa Valley, the first CM1 ever found
in the United States and only the second found outside of Antarctica. I
have included a few hunting stories and currently I am working on a few
--
From:
Sent: Wednesday, January 27, 2010 10:00 AM
To:
Subject: Meteorite-list Digest, Vol 77, Issue 82
Send Meteorite-list mailing list submissions to
meteorite-list@meteoritecentral.com
To subscribe or unsubscribe via the World Wide Web, vi
Hi list,
You guys who can't get to the Tucson show, but would like to pick up
some meteorites, please contact me off-list.
Regards,
Eric Wichman
760-522-2152
__
Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html
Meteorit
YouTube at the end of the e-mail (a must)
Reevaluating the age of the Solar System Gregory A. BrenneckaSchool of Earth
and Space Exploration, Arizona State University
Lead-lead (Pb-Pb) dating is among the most widely used radiometric dating
techniques to determine the age of really old things,
Agreed. Perception is often reality.
However, half the fun of this List is when the content spins from the
pedestrian to the academic.
Best,
Martin
On Wed, Jan 27, 2010 at 1:02 PM, Meteorites USA wrote:
> Without seeming to endlessly argue with the data presented. I would like to
> point out
Jason and Everyone,
To continue this discussion, I am labeling “who said what.”
>Phyllis: My reference to “bubbles” is to morphology, NOT voids. Another
>meteoritic example of “bubble morphology effects” is pallasitic olivines such
>as Springwater and Imilac.
Jason: So you're saying that th
Without seeming to endlessly argue with the data presented. I would like
to point out the the sharpness examples in the link you provided are
taken from a VERY small percentage of the overall image. In relation to
the entire photo taken as a whole the sharpness of the image is
comparable at any
Sorry, but it won't. The measures are small, but the optical physics are real.
http://www.kenrockwell.com/nikon/50-comparison/f-stops.htm
Best,
Martin
Eric wrote:
> An f/2.8 lens focused
> properly with the right settings will be just as sharp in the given DOF of a
> comparable photo/subjec
for similar photos its ok a 100 macro lens. I work normaly
with a Canon 100 mm macro, with a f10 max f16 close. If I
have to work on macro-micro mineralogy photos, I use Zeiss
lenses, with this lenses I arrive to take photos of crystals
under the 1 mm, mormaly max. 0.6 mm.
Matteo
M come Meteori
Uh... sure it can... In the DOF zone it will be crystal clear IF... It
depends on MANY factors such a light, shutter speed, film speed (er, uh,
ISO setting), autofocus setting, manual focus, type of lens, type of
glass in the lense, whether the lens is clean, whether the camera is
handheld or s
Hi All,
While 2.8 does not seem all that fast, it is a standard speed for
macro/micro lens. However, the big guns for sports, news, and wildlife
routinely have 2.8 firepower with the 300 2.8 as the standard and even
a 400 2.8! 500s and 600s are available in f4. Ultra wides in the 2.8
range are als
Dear List members,
I would like to offer some slices of the nice L3 Chondrite NWA 5923.
NWA 5923 is at the status "provisional", but should get the "official"
status soon.
A single stone of 950.6g was bought in Erfoud, Morocco in 2008.
Probably paired to NWA 5910 L3 987g
NWA5923 chondrules are
Agreed, but I was really only using the sports analogy as an example of
f-stop use because I assumed it would be familiar to people and they
could visualize what was being described much better. ;) The ultimate
point being that f-stop isn't the "controlling factor" for sharper
photos though it'
Hmm, where to start
How about a couple general points:
First, a smaller aperture is a bigger number as it represents a ratio
of lens diameter to aperture opening. I believe that is expressed
backward in the previous post. Further a doubling or halving of the
shutter speed or ISO is the same a
While there are exceptions, most lenses give their best optical performance
about two stops below their fully open setting. That's where you'll usually
get the best balance between overall resolution and minimum off-axis
aberrations.
Chris
*
Chris L Pet
Hello Again Phyllis, All,
> 1. My reference to “bubbles” is to morphology, NOT voids. Another
> meteoritic example of “bubble morphology effects” is pallasitic olivines such
> as Springwater and Imilac.
So you're saying that the bubbles on the surface of your irons are
like the olivine crysta
Hi Eric, Al, Erik,
> Erik is right, The higher f-stop of 22 will increase depth of field
...
Yes.
> ... not sharpness of focus.
Unless you have a very good lens, it will ALSO increase sharpness of
focus for stationary objects.
> This is why sports photographers use a low/large f-stop lens like
Erik is right, The higher f-stop of 22 will increase depth of field, not
sharpness of focus. Though it's related, it's not quite the same. Your
focus is not controlled entirely by f-stop, only the DOF and amount of
light allow into the camera.
This is why sports photographers use a low/large f
Rob,
That's great news that 2 images were taken of the meteorite trail. I had
speculated that if there were more fragments that fallen from the Lorton
meteorite they might have fallen on the military base and you confirmed it with
the 2 images. Great work Rob.
Shawn
[meteorite-list] Updat
Hi Mike-
Meteorites are falling at terminal velocity for miles before they hit. They
rapidly lose all of their original velocity components. So yes, this
particular meteorite would have behaved the same regardless of its entry
characteristics.
The ground is hard... really, really hard. In ma
Hi All,
Actually there is a further concern here. Although when a lens is
stopped down to its max it does have the greatest depth of field, but
it is also not at its sweet spot for sharpness. Usually a stop or two
less than max provides the sharpest image the lens is capable of. Here
is more about
How so? A meteorite's impact speed is a function of its shape and mass only,
and is unrelated to the details of its entry speed and angle. A meteorite
lands at an angle that deviates from vertical by at most a few degrees, with
that angle entirely determined by the near-ground wind speed and dir
>>guess this explains why it did so much damage?<<
Mike, I haven't been following this too hard, but am curious as to what
you mean about it explains the damage?
GeoZay
__
Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.h
I guess this explains why it did so much damage?
On Wednesday, January 27, 2010, Rob Matson wrote:
> Hi All,
>
> I finally received a good second image of the Lorton bolide smoke
> trail taken immediately after the fall (and before upper atmospheric
> winds distorted it). More importantly, the tw
Al is right on this one. The higher the F-stop number, the greater
the depth of field is, i.e more of a three dimensional object will be
in focus. The drawback to this is less light enters the lens thus
requiring a longer shutter speed. And, if your not careful, a
background that is too clos
Hi Erik and all,
I'd think just the opposite would be correct. A higher f-stop (f 22, 18
etc.) would create a better depth of field and the more open your iris is on
your camera (lower f stop, 1.8, 2.0 etc.) the less focused your items would
be. I think you just stated it backwards. Best!
--
My Response Jan 27, 2010
Subject: Re: [meteorite-list] Regmaglypts
Jason and All,
1. My reference to “bubbles” is to morphology, NOT voids. Another meteoritic
example of “bubble morphology effects” is pallasitic olivines such as
Springwater and Imilac.
A thought experiment: Once again, env
Hi All,
I finally received a good second image of the Lorton bolide smoke
trail taken immediately after the fall (and before upper atmospheric
winds distorted it). More importantly, the two images I have were
taken from sufficiently different vantage points that a good 3D
solution could be compute
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