Double effect question - DPChallenge Forums

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

06/28/2006 01:24:20 AM · #1

Can anyone please tell me why the doubling effect on the bulbs happened. I got a comment from wavelength, "little too long, blew out the lightbulbs. nice idea though," but can anyone elaborate?

SamDoe1

Canon EOS-350D Rebel XT

06/28/2006 01:30:24 AM · #2

The exposure was too long and the highlights in the lightbulbs blew out. You see the layered effect because of the way the filament is set in the bulb. You see the color on the sides of the bulb but the middle is blown out because that is where the filament is.

Edit to add: If you had left the shutter open longer, the whole bulb would have been blown out, not only the center of it. Is that what you were asking about? I wasn't quite sure.

Message edited by author 2006-06-28 01:35:49.

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

06/28/2006 02:10:50 AM · #3

Originally posted by SamDoe1:

Quite. Thanks for the response and it's just not clicking in my head why there is the second image of the filament layered on the photo. I've taken pictures of bright lightscources, but this is the first that I've noticed the effect on in this magnitude. Embarrased to say, but can you break it down any more than that?

SamDoe1

Canon EOS-350D Rebel XT

06/28/2006 02:18:25 AM · #4

I'm not quite sure exactly why you got what you got. I'm guessing you just had the correct shutter speed and angle to produce that effect where the filament is blown enough so that it wouldn't blow out the whole bulb. You could counter this with a narrower aperature. This would produce the star effect you see in many night time images.

kgeary

Canon EOS-5D Mark II

Sigma 35mm f/1.4 DG HSM for Nikon

06/28/2006 08:19:35 AM · #5

Originally posted by SamDoe1:

The star effect? The star effect is produced with a star filter.

alfresco

Nikon D700

Nikon AF-S NIKKOR 24-70mm f/2.8G ED

06/28/2006 08:26:08 AM · #6

Originally posted by specialk0783:

Originally posted by SamDoe1:
I'm not quite sure exactly why you got what you got. I'm guessing you just had the correct shutter speed and angle to produce that effect where the filament is blown enough so that it wouldn't blow out the whole bulb. You could counter this with a narrower aperature. This would produce the star effect you see in many night time images.

The star effect? The star effect is produced with a star filter.

As does a very small aperture. If you look at the images in the 30 second challenge a high number had starry lights due to the small apertures used.

Message edited by author 2006-06-28 08:26:39.

glad2badad

Apple iPhone 16 Pro

Lensbaby Sweet 35 Optic

06/28/2006 08:26:35 AM · #7

Originally posted by specialk0783:

... The star effect is produced with a star filter.

Quite frequently - not.

- Poor example, many others out there. Another thread mentioned some a day or two ago when discussing lens features.

Sometimes - yes.

glad2badad

Apple iPhone 16 Pro

Lensbaby Sweet 35 Optic

06/28/2006 08:29:39 AM · #8

Originally posted by jaydallen:

Can anyone please tell me why the doubling effect on the bulbs happened. I got a comment from wavelength, "little too long, blew out the lightbulbs. nice idea though," but can anyone elaborate?

Any other details available? Shutter speed, aperture?

It looks a bit soft also like maybe you had a slight shake - shutter release maybe?

06/28/2006 11:15:03 AM · #9

Originally posted by glad2badad:

Originally posted by jaydallen:

Can anyone please tell me why the doubling effect on the bulbs happened. I got a comment from wavelength, "little too long, blew out the lightbulbs. nice idea though," but can anyone elaborate?

Any other details available? Shutter speed, aperture?

It looks a bit soft also like maybe you had a slight shake - shutter release maybe?

As to the shake, the majority of my photos are taken without any stabalization as of now. I do use the environment (fences, gates, tables whatever I can find to help steady). The main reason is to develop a steady hand and conquer the so called 'basics' before I move on to longer shutter speeds. Also, not having invested in a tripod or monopod I don't know crap from gold in the market. I'll be asking more within a month, but for now I'm gunslinging...

Never heard of a star filter, so thats a quick lesson right there. I shot with a wide aperature mainly to reduce the shutter speed so it didn't shake more than it did, but in the future I'll remember that.

eschelar

Canon EF-S 17-55mm f/2.8 IS USM

06/28/2006 11:28:18 AM · #10

Star filters (the glass ones) are somewhat overrated IMHO... They are VERY limited in the types of pictures that you can take that uses them to good effect... Not saying that there aren't any... just most people don't take a lot of pics that really need them...

That 'star' effect is indeed from the edges of the aperture... it can even show up at wider apertures... What aperture did you use to take the shot?

You are new, so I might add that if you want that information to show up on your pic, you can click the 'Edit the picture details' when viewing the pic or click on the pic in your portfolio...

There's a spot for Shutter speed, aperture, ISO etc....

Here's an example of aperture edges creating a 'star' effect. f/13

Nikon AF Nikkor 50mm f/1.8D

06/28/2006 09:41:21 PM · #11

Thank for letting me know about the info section. I unfortunately do not have the info, shutter speed, aperature and the like, but from now on I will keep track. The pictures I have in my profile are all at least a few weeks old and I just have big jpgs left on my computer.

wavelength

Nikon D300

06/28/2006 10:07:24 PM · #12

Originally posted by jaydallen:

You should be able to view the EXIF info tags on the files in Picture Project or Nikon Capture o0r Nikon View. Picasa will show some, I have mixed results with Photoshop "image info". There are other programs specifically for EXIF extraction/editing, the names don't leap to mind right now, someone help me here...

Message edited by author 2006-06-28 22:08:20.