New Posts New Posts RSS Feed - ExpoDisc
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

ExpoDisc

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/20/2015 at 14:09
Skylar McMahon View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar

Joined: April/05/2011
Location: TEXAS
Status: Offline
Points: 5509

Anyone else using one?


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/20/2015 at 14:14
RifleDude View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: October/13/2006
Location: Texas
Status: Offline
Points: 14313
Howdy

It's great!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/21/2015 at 21:13
RifleDude View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: October/13/2006
Location: Texas
Status: Offline
Points: 14313
I guess we're the only ones using it, maybe?

How do you like it so far, Sky?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/24/2015 at 14:47
Skylar McMahon View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar

Joined: April/05/2011
Location: TEXAS
Status: Offline
Points: 5509

Perhaps, but I can't say enough about it. It has corrected white balance for me in more ways than one.


I plan on writing a review for the OT and include pictures.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/24/2015 at 19:25
RifleDude View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: October/13/2006
Location: Texas
Status: Offline
Points: 14313
Here's a quick comparison demonstrating the effectiveness of the ExpoDisk for setting custom white balance. The ExpoDisk slips over the end of your lens, you aim in the general direction of the source of lighting in the scene, put your camera in custom WB preset mode, and press the shutter button to meter the light through the ExpoDisk. It is a filter that contains a bunch of prisms on the front to pick up light from the scene from multiple directions and get an average light temp value of the surroundings. It is certainly more accurate than relying on your camera's Auto White Balance mode, and also more accurate than calibrating WB using a gray/white card, because light reflecting off the card can vary depending on the angle to the lens and the light hitting the card.

I set an egg on the couch cushion in my living room and took 3 photos: the first while using my camera's Auto White Balance mode, the second after setting custom white balance using an 18% gray card, and the third after setting custom white balance using the ExpoDisk. 

There are incandescent lights above and to the left, along with a window with filtered light further to the left of the subject position. All 3 photos were shot in RAW and no post-processing was done whatsoever. I only imported the RAW files into Lightroom, cropped the images, and exported to JPEG. Again, no adjustments to color, contrast, sharpening, etc. were made; the images are exactly as they came out of the camera. All 3 used the same camera settings: manual mode, f/2, ISO 400, 1/20 shutter speed, no flash, using my Nikon D800 with Voigtlander 58mm f/1.4 lens.

The first image was shot using the camera's Auto White Balance mode. As you can see, it is noticeably warmer than the other 2 images, with the egg having a yellowish tint. AWB is supposed to correct for the lighting, and this isn't complicated mixed lighting, yet it still got the WB wrong:



The next photo was taken after calibrating WB by aiming the camera at an 18% neutral gray white balance card in the same lighting conditions. As you can see, it has a much cooler WB, and is closer to reality, although the cushion color isn't quite correct, being a bit too "cool."



The last photo was taken after calibrating a custom WB using the ExpoDisk. As you can see, it's slightly warmer than the previous photo. As best I can tell, it's spot on. You'll have to trust me that the cushion color is more correct.



Once I started using the ExpoDisk, I will never go back to any other way of setting WB in-camera. Yes, if you're shooting in RAW, you can adjust WB any way you wish non-destructively. Still, having WB closer to reality is a big help with reducing post-processing time for photos where accurate color is critical, such as portraits, where you want accurate skin tones. Or, where you're shooting in weird mixed lighting. After you use it a few times, it's fairly quick and easy to set WB for the particular scene. At $50, it isn't very expensive. To me, it's worth every penny.

Give it a try!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/24/2015 at 20:13
Peddler View Drop Down
Optics Jedi Master
Optics Jedi Master
Avatar

Joined: July/04/2012
Location: Oswego,NY
Status: Online
Points: 9046
I like mine over easy.

Home fries, bacon & rye toast.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/28/2015 at 14:52
Skylar McMahon View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar

Joined: April/05/2011
Location: TEXAS
Status: Offline
Points: 5509

That is a much better explanation that I could have ever put in to words, Ted.  Plus you included illustrations to better illustrate how helpful it is to use. Excellent Job Sir! Excellent

That's the couch I nearly fell asleep on!


I will add, having this saved my life (photography life) at the wedding I recently shot. I was contending with Incandescent, halogen, and fluorescent lights. Luckily I was there early enough to shoot and get corrections that were very accurate prior to the ceremony using my son as a test subject for skin tones.

By far, to date, the best accessory I have bought for the camera.



Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/03/2015 at 21:02
koshkin View Drop Down
MODERATOR
MODERATOR
Avatar
Dark Lord of Optics

Joined: June/15/2004
Location: United States
Status: Offline
Points: 10966
I think the bigger question is why Ted was taking pictures on an egg...

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: August/03/2015 at 21:38
RifleDude View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: October/13/2006
Location: Texas
Status: Offline
Points: 14313
Big Grin
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "ExpoDisc"
Subject Author Forum Replies Last Post
There are no similar posts.


This page was generated in 0.234 seconds.