Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-09-2012, 09:31 AM   #1
New Member




Join Date: Oct 2010
Location: Port Elizabeth
Photos: Gallery
Posts: 12
Shutter speed

I was messing about recently with the drops of water concept. To try and freeze several drops in a row, I set the shutter to 1/8000 of a second, and shot on continuous mode. The noise was quite frightening in that I kept on thinking "How long will it take to wear the shutter mechanism out?". Thinking about it afterwards, I was wondering if the shutter actually closes when shooting in continuous mode. Are the sensors merely switched on and off, or does the shutter actually close. I hope to goodness that the mirror stays locked up when shooting continuous! Does anyone know?

I have had my K-5 for a month now, and shame, my poor K20D is feeling very neglected.

03-09-2012, 10:14 AM   #2
Pentaxian




Join Date: Dec 2011
Posts: 1,340
[deleted]

Last edited by beholder3; 08-12-2013 at 01:42 AM. Reason: [deleted]
03-09-2012, 11:28 AM   #3
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 1,940
If you use live view at least the mirror will stay up. That might save a little wear and tear.
03-09-2012, 01:58 PM   #4
New Member




Join Date: Oct 2010
Location: Port Elizabeth
Photos: Gallery
Posts: 12
Original Poster
Hate live view (struggle to see screen), but I think there is a mirror lock function. must rtm

03-09-2012, 02:00 PM   #5
New Member




Join Date: Oct 2010
Location: Port Elizabeth
Photos: Gallery
Posts: 12
Original Poster
Do you know what determines the exposure time, in electrical impulse that turns the sensor on and off, or how long shutter is open? May be stupid question but I just can not get my brain around the shutter being open for 1/8000 of a second.
03-09-2012, 02:02 PM   #6
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by LesC Quote
I was messing about recently with the drops of water concept. To try and freeze several drops in a row, I set the shutter to 1/8000 of a second, and shot on continuous mode. The noise was quite frightening in that I kept on thinking "How long will it take to wear the shutter mechanism out?". Thinking about it afterwards, I was wondering if the shutter actually closes when shooting in continuous mode. Are the sensors merely switched on and off, or does the shutter actually close. I hope to goodness that the mirror stays locked up when shooting continuous! Does anyone know?

I have had my K-5 for a month now, and shame, my poor K20D is feeling very neglected.
as others have indicated the shutter opens and closes, you have to remember that 1/8000 of a second is achieved by a narrow slit moving across the sensor at about 1/200 of a second.

this wlll lead to blurred water drops

the best way to really capture this is using a flash and lock the shutter open.
03-10-2012, 05:42 AM   #7
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,278
Lot of flexing and bouncing going on.
03-10-2012, 10:47 AM   #8
Pentaxian
RonHendriks1966's Avatar

Join Date: Jan 2009
Photos: Gallery
Posts: 8,714
That looks great. Can someone just make a picture of it with HSS?

03-10-2012, 03:32 PM   #9
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,278
QuoteOriginally posted by RonHendriks1966 Quote
That looks great. Can someone just make a picture of it with HSS?
It could take couple tries to get it right.
03-11-2012, 03:14 AM   #10
New Member




Join Date: Oct 2010
Location: Port Elizabeth
Photos: Gallery
Posts: 12
Original Poster
[IMG]c:\fb\2012\upload.jpg[/IMG]
03-11-2012, 03:19 AM   #11
New Member




Join Date: Oct 2010
Location: Port Elizabeth
Photos: Gallery
Posts: 12
Original Poster
Thanks for the clip. Amazing technology these days.
How did you insert the clip? I see that I can load a url, but can I insert a jpg? I wanted to show what I did manage to achieve. Got the technique right, was just interested in the mechanics, which this video shows superbly.
03-11-2012, 08:24 AM   #12
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,278
I did "copy and paste" the url after clicking on the "insert link" icon.
To load a image just click on the "attachments" paper-clip and browse to the folder you want the picture from. Then click on the image, after that "open" it and hit the upload .
03-11-2012, 05:44 PM   #13
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,792
you're approaching the subject in entirely the wrong way. What you need is a bright pulse of light to act as a "shutter" as opposed to using the physical shutter in the camera to stop motion. A pulse of light from a flash can be over 8X the maximum shutter speed of any camera, and since Xenon arc flash tubes don't wear out anywhere near as quickly as shutter units do, and it is certainly the safer option.

allow me to illustrate:


that image was captured with a Sigma 180mm f/3.5 with a wireless AF540FGZ set to 1/8th power the camera's shutter speed was only 1/180th but the pulse of light from the flash would have been closer to 1/12000th

QuoteOriginally posted by Ex Finn. Quote
Lot of flexing and bouncing going on.
okay that is a little disturbing *looks at Nikon D3s* I wonder what a 5000FPS slow motion video of the shutter in the Pentax 67 would look like.

Last edited by Digitalis; 03-12-2012 at 12:02 AM.
03-11-2012, 11:03 PM   #14
New Member




Join Date: Oct 2010
Location: Port Elizabeth
Photos: Gallery
Posts: 12
Original Poster
03-11-2012, 11:05 PM   #15
New Member




Join Date: Oct 2010
Location: Port Elizabeth
Photos: Gallery
Posts: 12
Original Poster
Thanks for all the responses. This is what I managed to get. I see I uploaded the original, not corrected. Need to get a flash capable of what is required. Thanks for all the tips.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, k-5, k-5 ii, k-5 iis, k5, mode, pentax k-5, shutter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
shutter speed FrumPilot Pentax DSLR Discussion 4 10-09-2011 12:00 PM
shutter speed Unregistered Visitors' Center 3 09-26-2011 01:25 PM
Shutter speed ronald Video and Pentax HDSLRs 15 04-03-2011 07:24 AM
Pentax KX Shutter starting to stuck at slow shutter speed. Spirit722 Pentax Film SLR Discussion 7 03-03-2011 09:49 PM
Shutter speed on K-x CrabShadow Troubleshooting and Beginner Help 7 08-14-2010 06:46 AM



All times are GMT -7. The time now is 12:01 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top