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DPChallenge Forums >> Tips, Tricks, and Q&A >> Trick quiz...
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 05/02/2007 02:16:42 AM · #1
OK, here's 2 shots taken on my Canon 400D, with the 18-55 kit lens. These are shots taken of some laser printing on a normal sheet of paper.

How did I do it? I'm expecting someone to come up with half the answer fairly quickly, but I think the full answer will be new for most.



I considered putting this in the "how'd they do it" forum, but decided it belongs better in here, because I'm just showing off a tip/trick.

Ooh, I nearly gave it away in the image comments. I've fixed them to not give it away.

Message edited by author 2007-05-02 02:17:14.
 05/02/2007 02:26:50 AM · #2
I give up. How'd you do it?
 05/02/2007 02:32:34 AM · #3
If not done in PP. I would say you shot it through a small opening on the lens. Maybe a piece of paper above and below. The first one is blurred more because it is shot at ISO400 and the second picture is blurred less because the ISO1600 let more light through the edges of the paper giving less of a blur.
 05/02/2007 02:51:42 AM · #4
Originally posted by swhiddon:
If not done in PP.

post-processing should be ruled out, else that effect is not special ;)
it looks like the angle is different for both images.
 05/02/2007 03:22:50 AM · #5

No post processing. OK, yes, there was some minor levels adjustment, a resize and a sharpening, but just the standard stuff. Nothing that really changed the overall effect.

There is no cropping, and nothing else involved. Just the camera and the lens. :)

At 100% viewing, that full stop looks like a pile of sand, slightly larger than the letter s in the version posted here. :)

05/02/2007 03:28:46 AM · #6
Originally posted by surfdabbler:
Just the camera and the lens.

lens reversal?
 05/02/2007 03:33:42 AM · #7

Here's a 100% crop of the full-stop!



05/02/2007 03:36:57 AM · #8
You changed the angle that you took the shot, that much is obvious.

Not sure how you got such a shallow DOF on an f/3.5 kit lens though. Do you have macro filters? Extension Tubes?

minimum focusing distance of 0.28m.. I don't know if that's enough to get that effect.

Message edited by author 2007-05-02 03:39:24.
 05/02/2007 03:39:06 AM · #9
Originally posted by crayon:
lens reversal?


Aha, give the man (or lady) a cigar. Ok, that's the first half of the problem. This is how to get macro out of the kit lens. Take off the lens, flip it around and hold it in front of the camera. It gives you a very close focusing macro lens, probably 2:1 magification, or slightly more, at only a few centimetres focusing distance.

Problem is, when you do this, you get very shallow DOF. And with no electrical contacts, you can't adjust the aperture, to increase the DOF.

In the original 2 shots, the first shows a classic lens reversal shot, with very thin DOF. How did I improve the DOF in the second shot? (Yes, it's a slightly different angle, which helps, but that's not the answer.) :)

Message edited by author 2007-05-02 03:53:24.
 05/02/2007 03:40:41 AM · #10
Originally posted by surfdabbler:
Originally posted by crayon:
lens reversal?


Aha, give the man a cigar. Ok, that's the first half of the problem. This is how to get macro out of the kit lens. Problem is, when you pull the lens off and reverse it, you get very shallow DOF. And with no electrical contacts, you can't adjust the aperture, to reduce the DOF.

In the original 2 shots, the first shows a classic lens reversal shot, with very thin DOF. How did I improve the DOF in the second shot? (Yes, it's a slightly different angle, which helps, but that's not the answer.) :)


haha.. I ruled out lens reversal because I misread your post and thought you'd mentioned no other lenses were used. I also don't know enough about lens reversals to even hazard a guess on this second one.

Never done it before.

Message edited by author 2007-05-02 03:41:38.
 05/02/2007 04:48:32 AM · #11
bit of paper to open the apature(spelling??) of the lens?
 05/02/2007 05:03:49 AM · #12
interesting, i'll try that with my 70-200 :-)
 05/02/2007 05:17:43 AM · #13
you set the aperture to (guess) f/8 and held down the DOF preview button before taking off the lens.
now gimme a cigar!
 05/02/2007 05:21:08 AM · #14
Did you do that eBay 'trick' which tells you to set the aperture and remove the lens while the camera's still switched on? *shrug*
 05/02/2007 05:35:41 AM · #15
Aha, you guys are too clever. I thought I'd come up with a new trick, but it turns out it's been done before. :)

Yes, I set the aperture, pushed the DOF preview, and then removed the lens while holding it down. This keeps the aperture previously set, and doesn't reset back open until the lens is reattached.

Thanks for playing!

(P.S. Yes, Oliver, you can have a cigar too.)

Message edited by author 2007-05-02 05:36:46.
 05/02/2007 06:07:16 PM · #16
Originally posted by surfdabbler:
Yes, I set the aperture, pushed the DOF preview, and then removed the lens while holding it down. This keeps the aperture previously set, and doesn't reset back open until the lens is reattached.


Now that is cool. I'm gonna give it a try. Love learning new(?) tricks :) Thanks for sharing it!
 05/02/2007 06:19:56 PM · #17
Scotch tape.

Ahh nevermind, I'm too late for the game.

Message edited by author 2007-05-02 18:20:19.
 05/02/2007 06:23:29 PM · #18
Originally posted by eyewave:
you set the aperture to (guess) f/8 and held down the DOF preview button before taking off the lens.
now gimme a cigar!


what about the sensor dust issue? I thought to keep a camera ON without a lens was a very bad idea - the static charge on the sensor would just suck up the dust. Ain't it so?

Message edited by author 2007-05-02 18:24:39.
 05/02/2007 06:25:38 PM · #19
Originally posted by LevT:
what about the sensor dust issue? I thought to keep a camera ON without a lens was a very bad idea - the static charge on the sensor would just suck up the dust. Ain't it so?


Ummm, yeah, maybe I won't give it a try just yet....
 05/02/2007 09:43:26 PM · #20

Yes, I don't know how much of a risk it is, but the anti sensor dust mechanism in the 400D certainly helps the peace of mind when I'm doing stuff like this. :)

05/05/2007 11:35:39 PM · #21
And then there's this discussion about the anti-dust feature...
 05/05/2007 11:59:13 PM · #22
Better way, IMO

Much better control over the output.
 05/06/2007 12:05:32 AM · #23
Originally posted by LevT:
Originally posted by eyewave:
you set the aperture to (guess) f/8 and held down the DOF preview button before taking off the lens.
now gimme a cigar!


what about the sensor dust issue? I thought to keep a camera ON without a lens was a very bad idea - the static charge on the sensor would just suck up the dust. Ain't it so?

sensor dust is over rated! who cares if you have a few specks!
 05/06/2007 03:28:22 AM · #24
Originally posted by chimericvisions:
Better way, IMO
Much better control over the output.


Hey, now that is really cool. I'll have to try this one out sometime too, when I have a few more lenses under my belt. Thanks for posting!

05/07/2007 08:54:11 AM · #25

Ooh, one word of warning. I won't post the photos, but if you start digging flies out of your window frames and take photos of them, don't be surprise if you feel a bit nausius after editing them. Flies are disgusting. Long dead flies are even worse. The detail is amazing, but sometimes this is not a good thing. Seriously, don't do it. :)

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