LEVBFS or not LEVBFS?

I tested my DA for LEVBFS after the BFS fix and I got satisfactory results for the test that I used: f/4...progressive shutter speeds from 1/60 to 1/1000

http://www.pbase.com/randy_d/bfsshutter_speed_test

Then I tried another test suggested on STF.

Shots taken at f/8.0 shutter speed 1/1000: Both taken at Manual Mode/Forced flash...then again at Full Auto with flash. Here are my results:

http://www.pbase.com/randy_d/levbfs

Do I have LEVBFS or not?

Thank You in advance for replies.

Randy D

Me too. Do I have LEVBFS? I think I did the right test. The pictures are all on manual, forced flash F8.0 starting with shutter speed 1/4 down to 1/1000. There is an incandescent light source on the right side.

I'm not sure if this is LEVBFS on just less light in the picture do due faster shutter speeds.

My 707 nhas been fixed for BFS.

http://www.pbase.com/karenc/levbfs&page=all

Thanks

Randy D said:

I tested my DA for LEVBFS after the BFS fix and I got satisfactory
results for the test that I used: f/4...progressive shutter speeds
from 1/60 to 1/1000

http://www.pbase.com/randy_d/bfsshutter_speed_test

Then I tried another test suggested on STF.

Shots taken at f/8.0 shutter speed 1/1000: Both taken at Manual
Mode/Forced flash...then again at Full Auto with flash. Here are
my results:

http://www.pbase.com/randy_d/levbfs

Do I have LEVBFS or not?

Thank You in advance for replies.

Randy D

Click to expand...

----Karen

The first test doesnt seem to show much. The subjects look pretty far away.

What you show doesnt necessarily show LEVBFS. And shots at a distance can introduce other effects. First of all you want to make sure you are not underexposing beyond the range of the flash. Pushing the flash too far and underexposing will give you blue shift LEVBFS or not.

If I take a photo of a person at 6 feet away - one in manual flash at 1/40th F2, and another at 1/60th F2.5 I see a definite blue shift that gets very strong as I further increase the shutter, or aperature or both. If yours doesnt do that - consider yourself lucky.

Randy D said:

I tested my DA for LEVBFS after the BFS fix and I got satisfactory
results for the test that I used: f/4...progressive shutter speeds
from 1/60 to 1/1000

http://www.pbase.com/randy_d/bfsshutter_speed_test

Then I tried another test suggested on STF.

Shots taken at f/8.0 shutter speed 1/1000: Both taken at Manual
Mode/Forced flash...then again at Full Auto with flash. Here are
my results:

http://www.pbase.com/randy_d/levbfs

Do I have LEVBFS or not?

Thank You in advance for replies.

Randy D

Click to expand...

As I mentioned earlier, the onboard flash isnt that great that you can do a reasonable test at these distances. Move lots closer and run the same series.

Karen said:

I'm not sure if this is LEVBFS on just less light in the picture do
due faster shutter speeds.

My 707 nhas been fixed for BFS.

http://www.pbase.com/karenc/levbfs&page=all

Thanks

Randy D said:

I tested my DA for LEVBFS after the BFS fix and I got satisfactory
results for the test that I used: f/4...progressive shutter speeds
from 1/60 to 1/1000

http://www.pbase.com/randy_d/bfsshutter_speed_test

Then I tried another test suggested on STF.

Shots taken at f/8.0 shutter speed 1/1000: Both taken at Manual
Mode/Forced flash...then again at Full Auto with flash. Here are
my results:

http://www.pbase.com/randy_d/levbfs

Do I have LEVBFS or not?

Thank You in advance for replies.

Randy D

Click to expand...

--
--Karen

Click to expand...

When I look at the blue shift that I get - I test with targets reasonably close (4-6 feet) and do the test with and without ambient light.

In most room situations even low lighting will have a very visable effect when combined with flash to produce the exposure - usually rendering the shot warmer. As you dial down the EV you are slowly taking the room light out of the equation and the shot becomes bluer affected by the flash color more and the tungston or halogen less. If the color balance is trying to include the ambient light things will look very blue.

When I take the ambient light out of the situation, the wide open shot will look a lot bluer than the same shot with the lights on - but I still see a blue shift going on as I go from (1/40 F2) TO (1/60th F2.8) TO (1/125 F4) but its not as dramatic.

When you run small stobes like this - they are interacting with the camera to ensure the TTL exposure is right for the aperature and shutter. Usually this is done by running more current through the flash to get higher levels of light. In some flashes, this effect alone makes the flash bluer.

If that is the case, the camera also has to dial in a correction to keep the shot from getting too blue.

If you are shooting a subject at quite a distance at lower EV range - you are going to push this little popgun out of its operating range and get underexposure and blue shifts. Thats why you may want to test with much closer subjects.

Hi Randy,

AS you have found from your tests, LEVBFS is not really a big issue to most users. In fact, you even have difficulties testing it.

I my opinion, all post-BFS-fix cameras have LEVBFS. Anyone who claims that his/her camera does not have LEVBFS is just because the tests were not done in the worst case conditions.

For example, your photos were done either without strong enough incadescent light influence or the surface not reflective enough.

Don't worry about LEVBFS, you cannot do anything about it now, so why not just enjoy your camera.

By judging your photos, you camera do have LEVBFS. However, if you are still interested in testing it, please read my recent posting:

http://www.dpreview.com/forums/read.asp?forum=1009&message=1830384

(Note: there is no need to take a lot of photos, you only need one photo in Auto mode and one in Manual mode for comparision. It is a lot easier to find out LEVBFS by comparing the Auto and Manual mode photos side by side. Also, take the photo closer at about 6 feet.)

JS

Hi Karen:

Your sample images show that your camera definitely has LEVBFS.

However, no worry, it also means that your camera do not have BFS anymore. You can rest assure that you will get pretty white-balanced photos each and every time in Auto mode with flash.

LEVBFS is nothing to be worried about as long as you do not use flash when in non auto modes.

So just enjoy your camera and have fun.

JS

Randy,

Also read this:
http://www.dpreview.com/forums/read.asp?forum=1009&message=1830520

Jade posted a few days ago about these filters (81A, 81B and 81C) and it's CHEAP and EASY. I put it to the test tonight.

Amy--beauty is really in the LCD/EVF of the beholder http://www.pbase.com/sfishy