Go Back   Steve's Digicams Forums > Digicam Help > General Discussion

Reply
 
Thread Tools Search this Thread
Old Apr 30, 2010, 11:35 PM   #41
Senior Member
 
VTphotog's Avatar
 
Join Date: Mar 2005
Location: Extreme Northeastern Vermont, USA
Posts: 4,229
Default

Quote:
Originally Posted by TCav View Post
If it were all noise and hot pixels, there would be just as many on the underside of the bridge, but there isn't.
So explain why they don't appear in the ISO 3200 shot.

brian
VTphotog is offline   Reply With Quote
Old Apr 30, 2010, 11:39 PM   #42
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,571
Default

I remember watching an interview with astrophysicist Neil deGrasse Tyson, Director of the Hayden Planetarium at the American Museum of Natural History in Manhattan. He was talking about growing up in New York City, and, when he was in college and considering a course in astronomy, he felt comfortable taking it. He remembers thinking that he had seen the stars; all six of them!
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Apr 30, 2010, 11:40 PM   #43
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,571
Default

Quote:
Originally Posted by VTphotog View Post
So explain why they don't appear in the ISO 3200 shot.
Because at ISO 3200, the image sensor is only 1/4 as sensitive to light.
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Apr 30, 2010, 11:49 PM   #44
Senior Member
 
VTphotog's Avatar
 
Join Date: Mar 2005
Location: Extreme Northeastern Vermont, USA
Posts: 4,229
Default

Quote:
Originally Posted by TCav View Post
Because at ISO 3200, the image sensor is only 1/4 as sensitive to light.
Yes, but the exposure time was longer by (about) the same factor, which is why the overall shot is lighted the same. This should make any stars present, as visible in one pic as the other.

brian
VTphotog is offline   Reply With Quote
Old Apr 30, 2010, 11:55 PM   #45
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,571
Default

So you tell me. Why are there more hot pixels and noise in the sky than on the underside of the bridge?
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Apr 30, 2010, 11:59 PM   #46
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

There are not hot pixel. The camera went to canon for service about a month ago. It came back perfect. They checked out the sensor also. Those pix do not show up in any shots I took to night of the same thing. The only difference from yesterday was it was hazier in NYC so no starts.

I will post only part of my updates in a little bit. But I got side track at completing my sample shots. I will post photos of what sided tracked me. And what I turn my canon lens on with my new ef 50mm 1.4.
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old May 1, 2010, 1:23 AM   #47
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

Here are the same shots with the pentax 100iso long exposure follow by the canon. Both camera were reset to factory setting, then I expanded the iso to use 12800iso. But have factory default on noise reductions. Auto White Balance. Shot was both at f7.1

Remember this post was intended for member considering moving up to an entry level high iso dslr form a point and shoot. So I wanted to use as much as what they would start out with first.

When I do the billboard shot I will adjust the whitebalance and set the NR to off on both cameras.
Attached Images
    
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old May 1, 2010, 1:26 AM   #48
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

Here are the pentax same defaults but at 3.5 from 3200, 6400, and 12800iso
Attached Images
   
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old May 1, 2010, 1:28 AM   #49
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

here are the canon ones.
Attached Images
   
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
Old May 1, 2010, 1:29 AM   #50
Senior Member
 
shoturtle's Avatar
 
Join Date: Dec 2009
Location: Frankfurt AM
Posts: 11,348
Default

Here are the crops of the pentax
Attached Images
   
__________________
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.
shoturtle is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 10:22 PM.