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03-07-2013, 06:18 AM   #3976
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Ryan, itschimitis, you guys win the thread I love the shots along lake superior. I feel like that must be the view from the front doors of the fortress of solitude.

03-07-2013, 05:17 PM   #3977
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Hey Ryan, just a curios questions, any reason to shoot at ISO 200 ? I understand that that is the default Pentax setting on this camera, but generally as a rule the higher the ISO the more chance of noise.. WIth your style of shooting and these images i guess they could all have been captured at 100 ? Just curious as to the logic or reasons why we all do different things. Great images BTW , lovely work.

I guess i answered my own question in a way, if Pentax have this as default then they must think this is optimum for this camera ?
03-07-2013, 05:23 PM   #3978
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QuoteOriginally posted by Bigvern1263 Quote
Hey Ryan, just a curios questions, any reason to shoot at ISO 200 ?
From my experience there's virtually no difference in the noise I see between ISO 100 and ISO 200 on the 645D, but I read somewhere that the dynamic range is highest at ISO 200, and given that the shutter speed on most of these images wasn't crucial and I knew that I'd most likely be pushing the files pretty far in ACR and PS, I went with ISO 200. ISO 100 is technically in the 'explanded' ISO range of the 645D. I've never been able to notice any noise until shooting at ISO 400, and even then it's very little. It starts noticeably showing at ISO 800 and is bothersome by ISO 1600.
03-07-2013, 09:02 PM   #3979
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QuoteOriginally posted by Ryan Tischer Quote
From my experience there's virtually no difference in the noise I see between ISO 100 and ISO 200 on the 645D, but I read somewhere that the dynamic range is highest at ISO 200, and given that the shutter speed on most of these images wasn't crucial and I knew that I'd most likely be pushing the files pretty far in ACR and PS, I went with ISO 200. ISO 100 is technically in the 'explanded' ISO range of the 645D. I've never been able to notice any noise until shooting at ISO 400, and even then it's very little. It starts noticeably showing at ISO 800 and is bothersome by ISO 1600.

Sounds a bit like the noise performance of the K10D and its kin. Fortunately the 645D is not usually called in to do the crazy high-iso stuff like its smaller cousins.

03-08-2013, 12:18 AM   #3980
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QuoteOriginally posted by Bigvern1263 Quote
I guess i answered my own question in a way, if Pentax have this as default then they must think this is optimum for this camera ?
Not necessarily.... I think the reason why Pentax did set the default at ISO 200 is found in the D-Range Settings (menu one, first page). If you want to activate this feature (perhaps it's activated at default, I don't remember) the lowest ISO will be 200, because the camera needs the expanded range to correct highlights.

As I always shoot in RAW I don't see any advantage of this feature and so I didn't activate it. Required exposure corrections I like to do myself in LR instead of delegate to my camera...


QuoteOriginally posted by Ryan Tischer Quote
From my experience there's virtually no difference in the noise I see between ISO 100 and ISO 200 on the 645D, ...
When I get my camera new I tried a lot of difference settings (you know, men and her new toy...) and I found a visible difference in IQ Quality between ISO 100 and 200. Not much, but visible. I didn't checked this anymore but since then my standard ISO always is 100.


QuoteOriginally posted by Ryan Tischer Quote
?..but I read somewhere that the dynamic range is highest at ISO 200,...
See above...
03-08-2013, 11:06 AM   #3981
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Ryan:

If you believe DxO, ISO 100 has about a stop more DR than ISO 200

DxOMark - Pentax 645D

Love the ice shots BTW
03-08-2013, 09:53 PM   #3982
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QuoteOriginally posted by Thomas Quote
If you believe DxO, ISO 100 has about a stop more DR than ISO 200

Interesting...well, maybe I was wrong about that, but I do remember reading somewhere that ISO200 was the best for DR, I guess you shouldn't believe everything you read on the internet!
03-08-2013, 09:56 PM   #3983
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QuoteOriginally posted by Ristretto Quote
I think the reason why Pentax did set the default at ISO 200 is found in the D-Range Settings (menu one, first page). If you want to activate this feature (perhaps it's activated at default, I don't remember) the lowest ISO will be 200, because the camera needs the expanded range to correct highlights.
When I first started using the 645D I used the expanded DR setting, but have stopped using it...I found that it introduced halos, sort of like bad HDR does, around tree lines in the sky and such.

03-08-2013, 11:05 PM   #3984
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Sequoias

"Young" tree around 400 years old, fallen elder, and mature pair around 1800 years old. 645D, p67 55-100, f13
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03-09-2013, 11:19 AM   #3985
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One from my last trip to the lakes, am back up there at the moment, but had the boiler break down in our place up here so had to stay in - not really a loss as it's been drizzly all day

Pentax 645D DA 25f/4 at 1/80 ƒ/13 ISO 200 25 mm


03-09-2013, 11:34 PM   #3986
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QuoteOriginally posted by Ryan Tischer Quote
Here are some new ice images I've captured over the past couple weeks along Lake Superior:
Those broken sheets of ice are really beautiful. I've never seen anything like them.
03-10-2013, 02:19 AM   #3987
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Pentax 645 with Tri-X.





03-10-2013, 10:11 AM   #3988
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645D + SMC 67 Takumar 400mm f/4 @ f/11 1/60s ISO100
03-10-2013, 12:48 PM   #3989
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Some other shots made in the past month or so :

67 set: Pentax 67 - a set on Flickr








03-10-2013, 01:48 PM   #3990
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Here is a shot from yesterday! Found some ice climbers practicing in the sun. Shot with 645d and fa 200mm.



Shit the image was compressed a little bit.
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