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11-15-2021, 03:08 PM - 1 Like   #17611
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QuoteOriginally posted by RICHARD L. Quote
This is not 1) Volcanic rock (like we see in Grants, New Mexico) or 2) Sandstone (like we see in Arches Nat'l Park, Utah). This looks like Granite and glaciers bulldozed and tumbled these very hard rock formations.

Volcanic rock crumbles and disappears over time, being light and porous. Sandstone is sculpted by wind erosion and by cycles of water freeze and thaw. It took enormous energy to move heavy Granite around.

Regards
Not volcanic in the sense it came from a volcano but it is of the same origin, magma. Magma that cooled much more slowly than magma that comes out as lava. If these rocks were moved by glacial activity it wouldn't have been very far since they formed right here. It's definitely granite. The granite for the Colorado State Capitol building was quarried nearby.

From USGS:

QuoteQuote:
Intrusive Igneous Rocks:
Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. Great globs of molten rock rise toward the surface. Some of the magma may feed volcanoes on the Earth's surface, but most remains trapped below, where it cools very slowly over many thousands or millions of years until it solidifies. Slow cooling means the individual mineral grains have a very long time to grow, so they grow to a relatively large size. Intrusive rocks have a coarse grained texture.
Most of the rocks are not loose like this balanced boulder and it generally looks more like the first photo in the set (which has the eroded remains of a long-dormant ancient volcano in the distance).


Last edited by mattb123; 11-15-2021 at 03:43 PM.
11-16-2021, 01:30 AM - 6 Likes   #17612
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It's been raining for the last month. This camera porn makes for some good closeup practice I can do indoors.



Mamiya C3 - Stowed
by tuco, on Flickr



Mamiya C3
by tuco, on Flickr

45 Wista RF, Caltar-S II MC 210mm, Delta 100, D-23
11-16-2021, 06:40 AM - 8 Likes   #17613
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Well, it's not originally "Medium Format" pictures but they show "Rock formations".


Grand Canyon Shales eroded by the Colorado River


Eastern Sierra Nevada : old Granite and recent Volcanic Rock


Yosemite : Granite ground by glaciers


Arches Nat'l Park : Sandstone eroded by wind and water


Catalina Mountains : Granite eroded by freeze/thaw cycles


Monument Valley : Sandstone eroded by wind


Arches made of sandstone


Delicate Arch, Utah


Shales originating from underwater deposition of clays over eons


Sandstone in Valley of Fire


Percé Rock, Quebec, remnant of the Atlas Mountain Range in Morocco


Chiricahua Hoodoos made of sandstone


Rocky Mountains: Granite scoured by glaciers


Chiricahua Hoodoos close-up


Sierra Nevada Range made of Granite


Joshua Tree Nat'l Park calcium concretions


Recent Volcanic Rock, Grants, N.M.

Imagine all the mileage I'll have to do to re-photograph these scenes in Medium Format (SIGH) ...

Last edited by RICHARD L.; 11-16-2021 at 06:51 AM.
11-17-2021, 12:06 AM   #17614
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Richard, that is an amazing collection of pictures and a comprehensive bucket list. Now that the glaciers are melting some interesting mountains, previously covered in ice, are also creating new spectacular views, especially in South America.

Thank you for sharing.

11-17-2021, 04:19 AM - 1 Like   #17615
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QuoteOriginally posted by TDvN57 Quote
Richard, that is an amazing collection of pictures and a comprehensive bucket list. Now that the glaciers are melting some interesting mountains, previously covered in ice, are also creating new spectacular views, especially in South America.Thank you for sharing.
Thank you very much, Theuns. Indeed it took me 5 trips to the American Southwest (100 000 kilometers), lots of reading and lots of energy to visit all those magnificent sites.

Best Regards
11-17-2021, 06:38 AM - 7 Likes   #17616
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Medium format flowers

Clematis Pink Champagne from our garden, taken with 645Z but do not recall which lens but probably the HD Pentax-D FA 90mm f 2.8 macro.
Attached Images
 

Last edited by ivanvernon; 11-17-2021 at 06:42 AM. Reason: Added information.
11-17-2021, 01:44 PM - 4 Likes   #17617
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Some more from the cruise earlier in the year around the UK...

1. GFX 100s GF100 - 200



2.



3.



4.



5.



6. BW



11-18-2021, 05:13 PM - 7 Likes   #17618
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Sunrise from the Queen Elizabeth off Soain/portugal

GFX100s GF 23 f/4

11-18-2021, 11:50 PM - 7 Likes   #17619
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Some re-edits from our trip to north Finland in 2016:

#1 looks like a possible XMas card.

#2 This is one of the reasons I want to go back to Northern Norway instead of Finland. In retrospect what I've discovered since that trip is that you should make a shortlist of ideal landscape scenery and then select the ideal aurora conditions from amongst these shortlist of landscapes. Next time I would rather take two shots and blend to get the best of the landscape and the colorful sky.

#3 And this is Santa's Cabin

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PENTAX 645Z  Photo 

Last edited by TDvN57; 11-19-2021 at 03:02 AM.
11-19-2021, 08:57 AM - 4 Likes   #17620
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this morning about 4am, peak of the eclipse
GFX50Sii w/ Pentax 645 FA400/5.6
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11-20-2021, 06:01 AM - 4 Likes   #17621
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Percé Rock, QUEBEC. In June, the Sun rises just behind the "Rocher" at 5h00 AM.

Pentax 645Z + 645 80-160 mm f/4.5 @ f/11, leaning on the side window frame of my 5-ton Ford camper.

11-22-2021, 10:59 AM   #17622
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QuoteOriginally posted by cdd29 Quote
this morning about 4am, peak of the eclipse
GFX50Sii w/ Pentax 645 FA400/5.6
Nice capture! Interesting to see Fuji with Pentax 400 examples.
Thanks for sharing,
barondla
11-22-2021, 12:23 PM - 5 Likes   #17623
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QuoteOriginally posted by Ed Hurst Quote
Reminds of my pre Pentax 67ii days when I shot with a Mamiya C330F. ... Funnily enough, I used to shoot Delta with those bodies on occasion.
I finally got around to try the camera out including Mamiya's paramender parallax compensator. I like the results. The lack of any DOF preview was missed for closeup work. And I found it easier to just calculate the exposure compensation based on bellows extension than look at and interpret the builtin, microscopic font size closeup scale. I can see I'll want a 55mm for it.



1918 Brass Compass
by tuco, on Flickr

Mamiya C3, Sekor 80/2.8, Delta 100, D-23

Last edited by tuco; 11-23-2021 at 09:17 AM.
11-22-2021, 02:46 PM   #17624
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QuoteOriginally posted by tuco Quote
I finally got around to try the camera out including Mamiya's paramender parallax compensator. I like the results. The lack of any DOF preview was missed for closeup work. And I found it easier to just calculate the exposure compensation based on bellows extension than look at and interpret the builtin, microscopic font size closeup scale. I can see I'll want a 55mm for it.



1918 Brass Compass
by tuco, on Flickr

Mamiya C3, Sector 80/2.8, Delta 100, D-23

I love how co-ordinated the body and lens are (i.e,. same era) but if you want the best performance, I recommend the late series lenses. The very last black 80mm (with purple coatings) does very well indeed, and there are late series 55's as well.
11-22-2021, 04:04 PM   #17625
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QuoteOriginally posted by tuco Quote
I finally got around to try the camera out including Mamiya's paramender parallax compensator. I like the results. The lack of any DOF preview was missed for closeup work. And I found it easier to just calculate the exposure compensation based on bellows extension than look at and interpret the builtin, microscopic font size closeup scale. I can see I'll want a 55mm for it.



1918 Brass Compass
by tuco, on Flickr

Mamiya C3, Sector 80/2.8, Delta 100, D-23
Love the ancient compass. Great detail and tonality.
Thanks for sharing,
barondla
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