Focal Distance Question
May 5, 2013 14:15:55 #
stryvya
Loc: Camborne, Cornwall
If I stand 10ft from a mirror and want to take a Photo of my self what distance is my Camera away from the the image in the Mirror??
10 ft because that's where the Mirror and Reflection actually is?
Or 20ft because I appear to be 10ft further away from the Mirror?
OK silly question but it baffles me
10 ft because that's where the Mirror and Reflection actually is?
Or 20ft because I appear to be 10ft further away from the Mirror?
OK silly question but it baffles me
May 5, 2013 14:21:42 #
stryvya wrote:
If I stand 10ft from a mirror and want to take a Photo of my self what distance is my Camera away from the the image in the Mirror??
10 ft because that's where the Mirror and Reflection actually is?
Or 20ft because I appear to be 10ft further away from the Mirror?
OK silly question but it baffles me
10 ft because that's where the Mirror and Reflection actually is?
Or 20ft because I appear to be 10ft further away from the Mirror?
OK silly question but it baffles me
Reality is that you are ten feet away from the mirror.
May 5, 2013 14:22:15 #
May 5, 2013 14:24:11 #
stryvya
Loc: Camborne, Cornwall
Just thought it would make an interesting query, and I really wanted to know!!
May 5, 2013 14:25:19 #
Two wrong answers. Bzzzzzzzt!
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
May 5, 2013 14:30:02 #
GoofyNewfie wrote:
'Xactly!Two wrong answers. Bzzzzzzzt! It's really simple to test.
Set your focus at 20-feet if YOU want to be in focus, 10-feet if you want the mirror in focus.
Set your focus at 20-feet if YOU want to be in focus, 10-feet if you want the mirror in focus.
May 5, 2013 14:39:12 #
May 5, 2013 14:53:22 #
GoofyNewfie wrote:
Two wrong answers. Bzzzzzzzt!
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
Thank you, learned something new. :-)
May 5, 2013 15:01:19 #
Joyfullee wrote:
Reality is that you are ten feet away from the mirror.
Sorry, I re- read your answer and you are correct in that the mirror is 10 feet away. It doesn't answer the question of where to focus, but your statement is correct as far as it goes.
From: Jay Moore Photography
http://jaymoorephotography.com/blog/?m=201103
This photo shows that focusing on the reflected image IN the mirror throws the mirror out of focus, so there are two different focusing distances, to answer the OP's question.
May 5, 2013 15:36:09 #
GoofyNewfie wrote:
Two wrong answers. Bzzzzzzzt!
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
Another Bzzzzzzzt!
Well, correct, but not the only solution.
50mm lens, focal distance 11 feet, f/22, depth of field 7 to 27 feet. Best of both worlds! :P
May 5, 2013 15:50:58 #
GoofyNewfie wrote:
Two wrong answers. Bzzzzzzzt!
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
It's really simple to test.
Set your focus at 20 ft if YOU want to be in focus, 10 feet if you want the mirror in focus.
Right! Mirrors have always mystified people - even photographers today. Remember "Through the Looking Glass"? In the Middle Ages, people were suspicious of mirrors because everything was reversed, and it looked like people were way back in there somewhere.
Play around with a camera's focus while looking at yourself in a mirror, and you will see how to focus.
May 5, 2013 15:54:55 #
Not a silly question at all! My engineer brother didn't know why my dog is in focus while the computer is not. I learned the "double the distance" back in film photography. With no auto-focus and you wanted to use tripod and compose image a certain way - with shallow depth of field - you had to know that to keep the subject's reflection in focus requires doubling the distance from camera to mirror.
May 5, 2013 18:23:14 #
OddJobber wrote:
Another Bzzzzzzzt!
Well, correct, but not the only solution.
50mm lens, focal distance 11 feet, f/22, depth of field 7 to 27 feet. Best of both worlds! :P
Well, correct, but not the only solution.
50mm lens, focal distance 11 feet, f/22, depth of field 7 to 27 feet. Best of both worlds! :P
Got me, OddJobber!
Well,sort of.
Good use of applying hyperfocal distance.
http://www.dofmaster.com/hyperfocal.html
http://www.nikonians.org/reviews?alias=dof-and-hyperfocal-distance-tables-and-calculator
Getting everything in focus is not my taste these days.
I'm in my "shallow depth of field" period.
May 5, 2013 20:49:48 #
Learning Wedding photography I was taught that it was the distance to the mirror + the distance to the subject. If I am 10' from the mirror and the bride was 5' the setting would be at 15'. Another question along this line. I am nearsighted and can see up close just fine. Then why do I need my glasses to focus on ground glass on a view camera or the ground glass on a SLR or DSLR? - Dave
May 5, 2013 21:04:36 #
Maybe because you need more diopter correction than your camera(s) offer. I'm also nearsighted (20/200) and I can get the screen in focus with diopter adjustment, so I never wear my glasses to shoot.
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