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DPChallenge Forums >> Hardware and Software >> Can you take SLR lenses apart?
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Showing posts 51 - 57 of 57, (reverse)
AuthorThread
 04/11/2006 08:57:43 PM · #51
Ive been messing with the teleconverters im starting to understand now. There are a few things i overlooked in the begining.
 04/11/2006 09:09:50 PM · #52
Originally posted by BowerR64:
Ive been messing with the teleconverters im starting to understand now. There are a few things i overlooked in the begining.


Hahaha! That's GOT to be one of the great "back to earth with a thud" lines ever uttered :-)

Robt.
 04/12/2006 03:07:17 AM · #53
The curve and the thickness isnt right. The first and the last one have the right curve so those may have a better chance then the rest. The silver one i can see wont work.



I think mine will need a lens that does not have a steep curve but has some distance between them like the first one, and the last one.

Message edited by author 2006-04-12 03:09:34.
 04/12/2006 07:20:27 AM · #54
Try out this optics applet;

//webphysics.davidson.edu/Applets/Optics/intro.html

Place an 'object' on the left, and a couple of lenses. Make one of them convex, and one concave (do this by dragging the points towards the lens)

You'll see how various combinations affect the focal point, and more importantly how parallel (or not!) the light rays are when they come out the other end.

This is a fairly simple demo of optics, but I found it useful when I was trying to visualise the effect each type of lens had on the rays.

Message edited by author 2006-04-12 07:20:37.
 04/12/2006 10:00:20 AM · #55
Thats not how these are though.

The front large lens is curve on the front, and flat on the back. Then the concave lens in the rear has a shaper concave section on the back then it does in the front.

Can you adjust both sides with that app?
 04/12/2006 10:19:40 AM · #56
Originally posted by BowerR64:
Can you adjust both sides with that app?

I'm not sure, but there are hundreds of optics apps available at;

//dmoz.org/Science/Physics/Optics/Software/

It's just I found that particular one interesting to mess about with, without getting too mathematical.
 04/12/2006 10:56:20 AM · #57
Originally posted by BowerR64:
Originally posted by Spazmo99:
Getting it apart is the easy part, it's getting all those tiny pieces to go back together without any leftovers that's the real trick...


But i dont want to put it back together. I just want to ditch the appature and the lenses near the threads.


Then, by all means, wrench away. I doubt that you'll actually accomplish anything other than learning the hard way not to take your lenses apart in the first place.

Just don't complain about not being able to get it all back together and how much service is charging you to re-assemble your bag 'o parts back into a functional lens.
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