Accidently Adjusted Flange Focal Length

Vincent Oliver · August 30th, 2009, 09:37 AM

"Who am I to doubt you Doug? "

I didn't mean this as a sarcastic remark Doug, in fact far from it. I respect and value your opinions and advice, they certainly have helped me to become a better cameraman.

I will still put my lenses through a test, just so I know where the sweet spot is on my equipment.

Cheers :-)

Doug Jensen · August 30th, 2009, 12:55 PM

Quote:

Originally Posted by Vincent Oliver

"Who am I to doubt you Doug? "

I didn't mean this as a sarcastic remark Doug, in fact far from it.

Don't worry, I took it the right way. I'm sorry if I sounded like I didn't get it. Everything is cool.

Glynn Morgan · August 30th, 2009, 10:19 PM

I would be keen to see those test's screen grabs to see if my own EX is in the bounds of sharpness.

Vincent Oliver · August 30th, 2009, 10:25 PM

Glynn, put your camera on a sturdy tripod and shoot 10-20 seconds of material at each aperture. Use a Progressive mode rather than interlaced. On my tests I usually say the the settings so when I play back a clip I know what it was shot at. Try the same sequence of tests under soft and strong lighting.

Although all the advice is not to go beyond f8, shoot some footage at f8, f11 & f16 if only to open your eyes to what the results will look like.

Have fun.

I will post my tests later this week, have to finiish of another assignment first.

Alister Chapman · August 31st, 2009, 12:20 PM

At the end of this video there are some examples of diffraction limiting.

YouTube - Aperture, Depth of Field and Diffraction. How to Guide.

Glynn Morgan · September 1st, 2009, 05:52 AM

I found a room, stuck a focal chart on the door and did the aperture sharpness test. Really cool to see the theory proven. f8 and f11 aren't too good.

I noticed my Mid shots at f2.8 and f4 were a bit blurry though, don't know why that could be.

Thoughts?

f1-f4

Glynn Morgan · September 1st, 2009, 05:56 AM

f4-f11

only showed WS of f11, cos you can see it so clearly.

These are JPEG files but they are the same res and are identical to the eye to the BMP's

Think my camera is up to scratch?

PS: I know my WB is completely out of whack - i should have reset it.

Glynn Morgan · September 8th, 2009, 07:35 AM

^ Results to be expected?

Glynn Morgan · September 21st, 2009, 10:08 AM

Hah, I am going to assume they are. Cheers everyone for your help in this thread. :]

Glynn Morgan · May 10th, 2010, 02:12 AM

I'm now selling this Ex3 for an overseas opportunity, but I do need to know if these are acceptable back focus images before I sell it. I don't want to sell someone something that needs a service.

August 30th, 2009, 09:37 AM	#46
Vincent Oliver Trustee Join Date: Sep 2004 Location: Chislehurst, London Posts: 1,724	"Who am I to doubt you Doug? " I didn't mean this as a sarcastic remark Doug, in fact far from it. I respect and value your opinions and advice, they certainly have helped me to become a better cameraman. I will still put my lenses through a test, just so I know where the sweet spot is on my equipment. Cheers :-) __________________ Eyes are a deaf man’s ears. Ears are a blind man’s eyes

August 30th, 2009, 10:25 PM	#49
Vincent Oliver Trustee Join Date: Sep 2004 Location: Chislehurst, London Posts: 1,724	Glynn, put your camera on a sturdy tripod and shoot 10-20 seconds of material at each aperture. Use a Progressive mode rather than interlaced. On my tests I usually say the the settings so when I play back a clip I know what it was shot at. Try the same sequence of tests under soft and strong lighting. Although all the advice is not to go beyond f8, shoot some footage at f8, f11 & f16 if only to open your eyes to what the results will look like. Have fun. I will post my tests later this week, have to finiish of another assignment first. __________________ Eyes are a deaf man’s ears. Ears are a blind man’s eyes

August 31st, 2009, 12:20 PM	#50
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	At the end of this video there are some examples of diffraction limiting. YouTube - Aperture, Depth of Field and Diffraction. How to Guide. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

September 1st, 2009, 05:52 AM	#51
Glynn Morgan Regular Crew Join Date: Feb 2009 Location: Australia Posts: 119	I found a room, stuck a focal chart on the door and did the aperture sharpness test. Really cool to see the theory proven. f8 and f11 aren't too good. I noticed my Mid shots at f2.8 and f4 were a bit blurry though, don't know why that could be. Thoughts? f1-f4 Attached Thumbnails

September 1st, 2009, 05:56 AM	#52
Glynn Morgan Regular Crew Join Date: Feb 2009 Location: Australia Posts: 119	more f4-f11 only showed WS of f11, cos you can see it so clearly. These are JPEG files but they are the same res and are identical to the eye to the BMP's Think my camera is up to scratch? PS: I know my WB is completely out of whack - i should have reset it. Attached Thumbnails

August 30th, 2009, 10:19 PM	#48
Glynn Morgan Regular Crew Join Date: Feb 2009 Location: Australia Posts: 119	I would be keen to see those test's screen grabs to see if my own EX is in the bounds of sharpness.

September 8th, 2009, 07:35 AM	#53
Glynn Morgan Regular Crew Join Date: Feb 2009 Location: Australia Posts: 119	^ Results to be expected?

September 21st, 2009, 10:08 AM	#54
Glynn Morgan Regular Crew Join Date: Feb 2009 Location: Australia Posts: 119	Hah Hah, I am going to assume they are. Cheers everyone for your help in this thread. :]

May 10th, 2010, 02:12 AM	#55
Glynn Morgan Regular Crew Join Date: Feb 2009 Location: Australia Posts: 119	Selling I'm now selling this Ex3 for an overseas opportunity, but I do need to know if these are acceptable back focus images before I sell it. I don't want to sell someone something that needs a service.