Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon EOS dSLR

Thread Tools Search this Thread
Old Nov 2, 2017, 4:46 PM   #1
Senior Member
Join Date: Jun 2004
Posts: 632
Default Help, this is not going well

Today, I tried to take a photograph of a milkshake in a clear cup. It was in a mesh white lightbox with lights on the side attempting to illuminate what's inside the box.

The results were horrible.

Here's some info:
Canon 5d Mark III
Tamron 24-70 2.8f VC lens (tried both mounted and handheld)
ISO 800
70mm focal length.

What am I doing wrong? I've never shot with a light box before. So I may be totally messing that up.

I thought maybe my camera is not focusing properly. So i shot at something else and the focus looks fine. I have also had a professional calibrate the microadjustment for focus.

Thanks for your help. I need to get this right by the end of the work day Friday.

Faithfully (but frantically) yours,
Attached Images
FaithfulPastor is offline   Reply With Quote
Sponsored Links
Old Nov 2, 2017, 5:40 PM   #2
Senior Member
Join Date: Jan 2011
Location: Australia, New South Wales central coast
Posts: 2,935

G'day FP

For the moment - forget the camera & lens stuff

1- what colour is the liquid? ... has it been realistically represented?
2- what type of light source are you using in the light box? ... flash? 3200k bulbs? [the lo voltage sort of halogen bulbs]
3- have you tried another item [flower, jewellry etc.] to check colour & exposure responses?

Hope this helps
Has Lumix mirrorless & superzoom cameras and loves their amazing capabilities
Spends 8-9 months each year travelling Australia
Recent images at http://www.flickr.com/photos/ozzie_traveller/sets/
Ozzie_Traveller is offline   Reply With Quote
Old Nov 2, 2017, 8:36 PM   #3
Senior Member
VTphotog's Avatar
Join Date: Mar 2005
Location: Extreme Northeastern Vermont, USA
Posts: 4,252

Your light source is not consistent from one side to the other. B/g, which presumably is white, goes from bluish on bottom right, to yellowish at top left. This may be partly due to the color of the liquid and the light stronger on the right.
If this is to show the product, try using a smaller aperture - f/8 perhaps, and a lower ISO. This will make for a longer shutter time, but if your camera is mounted, that shouldn't be a problem.
VTphotog is offline   Reply With Quote
Old Nov 2, 2017, 9:11 PM   #4
Senior Member
TCav's Avatar
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,610

I think you've got a Depth of Field issue. You're shooting down at the cup, and the rim closest to you is in focus but the far rim and the bottom of the cup are out of focus.

At its minimum focus distance of 15 inches, at f/4.0, the DoF is a tenth of an inch fore and aft. At double the distance, it's still only 1/2 inch.

To get 3 inches (the presumed width of the cup) of DoF at that focal length and focus distance, you need to go smaller than f/11, and even that won't be enough if you still focus on the rim nearest to you.

I'd try a longer lens at a longer focus distance to get enough DoF to get the whole cup in focus.
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Nov 6, 2017, 4:30 PM   #5
Super Moderator
Mark1616's Avatar
Join Date: Oct 2005
Posts: 7,451

Some good questions asked about colour representation, etc. I agree re depth of field, for this sort of thing, I would want to be at f/11 or higher, so go back to tripod, use a trigger or 2 second delay and see how you get on.
[SIZE=1][SIZE=2]Any problems with a post or thread please use the report button at the bottom left of the post and the team will help sort it out.
Mark1616 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 12:58 AM.