Jump to content


Tom_Kline

Member Since 07 Nov 2004
Offline Last Active Today, 10:14 PM
*****

#349927 TTL, a-TTl, e-TTl, e-TTL II

Posted by Tom_Kline on 06 July 2014 - 03:27 PM

TTL without any extra letters refers to the Nikon/Nikonos film type TTL as you surmised - light was measured bouncing off of the film during the exposure and the flash quenched accordingly. The newer systems are mutually incompatible. Most use pre-flashes to determine the flash exposure prior to taking the picture. You need a separate adapter, if one is available, for each type.


  • Ram likes this


#348910 Underwater reflection photography

Posted by Tom_Kline on 10 June 2014 - 01:42 PM

You are looking through Snell's window. http://en.wikipedia..../Snell's_window

Avoid getting too much of the surface (looking upward) in the shot to not get this effect.

Tom




#340894 D800 write to card delay

Posted by Tom_Kline on 19 December 2013 - 08:11 PM

Sean,

It sounds like you have long-exposure noise reduction activated on your camera. Shoot long exposures manually - you should see a similar relationship. You can deactivate this feature via menus, but you will get long-exposure noise.

Tom

 Is this normal for a camera to take 30 seconds to write after a 30 second exposure?...  It pretty much seems to take a second to write each second of exposure.  

Sean

 

 




#340606 Your Favourite/Best Image of 2013

Posted by Tom_Kline on 13 December 2013 - 05:19 PM

I look forward to this thread every year. One reason why I chose this photo showing Chinook Salmon (as of 2013 common names of North American fishes are to be capitalized- https://afs.confex.c...Paper12336.html) was because it is the one North American Pacific salmon species not found spawning in my backyard (within 10km of my abode) so I have relatively few of them in my portfolio. I took it while on a drive around the state looking for them in cataloged streams. It was partly cloudy on the day I took this shot (available light only) - I got in just a few shots with the sparkle of direct sunlight and this one is my favorite. I returned to this location a week later and the water was quite murky.

 

Chinook Salmon is also a species of concern in many Alaskan systems. These are in a tributary of the Deshka River (a couple hour drive north of Anchorage), which got an escapement of 18.5K this year. This was up a bit from recent years but much less than years ago.

Attached Images

  • XG7G1284-2.jpg



#334754 Getting new lens for D700

Posted by Tom_Kline on 22 July 2013 - 11:16 PM

Here is an example of shooting a fisheye lens wide open. In this case a 10.5mm on DX format. Note how the algae in the center foreground is in focus and on the left and right in the background but not the center. This is due to the curved field of the virtual image formed by the dome port.

Attached Images

  •  2006-07-23-134813.jpg



#334728 Getting new lens for D700

Posted by Tom_Kline on 22 July 2013 - 09:30 AM

All the wrecks I am photographing as deep and dark, as I are trying to stay with something in the f2.8 range of lens to reduce the amount of ISO level I need to crank up when getting these ambient light images.

 

Hi Barry,

One of the constraints of underwater photgraphy is the need to focus on the curved virtual image projected by a dome port. This means stopping your lens down to a small aperture to attempt to get peripherial parts of the image in focus; the wider the lens angle, the smaller the aperture that is needed (you may need f/11 or smaller). It helps to use a larger dome port as well (one with a larger radius of curvatue; an 8" hemisphere is not all that large when dealing with extreme wide angle lenses). To use a 14mm lens on full frame you may need to use a combination of high ISO and a powerful wide angle strobe. The exception is when you have little detail away from the center of the image such as mostly empty water. Your image showing the beam of the diver's light is an excellent example of this exception.

Tom




#323090 Favourite Image Of 2012

Posted by Tom_Kline on 21 December 2012 - 05:40 PM

This is a thread I look forward to. Nevertheless it can be a challenge to decide which image to show. I have been thinking about this for a while so was prepared with this shot in mind.

I have taken many pix of salmon spawning. For many of these shots it would not likely be possible for someone not rather knowledgeable about salmon or fish behavior to know what behavior was being shown without a caption. For example, I have many shots of females digging - either during preparation of the nest or redd as well as after spawning when the female covers the redd. These pix show a fish turned sideways. Eggs typically are hidden by milt and drop out of sight during spawning and so often I do not get any or just a few eggs in a pic.

In this shot a number of eggs are clearly seen. The female is turned just completeing a digging action following spawning, which has raised them into the water column, a bit atypical. The strobe light (from a Seacam Seaflash 250D) hit them just beyond the shadow cast by the male. I also like the play of light on the female's head. She has just tapped the surface, something they often do. Note the ripple. FYI, the egg in the foreground is probably from a different female. Eggs get displaced when females dig near a previously laid clutch. I suspect this is one. Camera: Canon EOS 1Ds MkII and 8-15mm zoom at 15mm. Seacam housing. Taken using remote control from about 10 meters away.

Attached Images

  • _G7G1591.jpg