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How to keep aperture down after detaching the lens?

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Ky Nam

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I want my 30mm lens stops down to f/4 or so when it is detached from the camera.

Is it possible to do this?
 
I don't know if this is possible. Maybe you can set the aperture to f4 while the lens is attached and then remove the lens while the camera is still powered.
 
kernel panic said:
kernel panic wrote:

I don't know if this is possible. Maybe you can set the aperture to f4 while the lens is attached and then remove the lens while the camera is still powered.

--
www.mirrorlessdb.com
Click to expand...
Try it. Then reinsert the lens in the camera. Power it up and read the aperture. If it stayed the way you pulled it from camera, try different aperture stops. If it's 100% consistent, you're good.
 
The aperture on the lens is changed when it's taking a photo. Otherwise it's wide open I think.

Try in M mode, set the aperture to what you want, and the shutter speed to 3 seconds. Then take the lens off while it's taking the photo (this works on my nx10).
 
You either need to be pressing DOF preview or change the camera to video mode and set video to manual. You can then select the aperture and the lens will actually change to that aperture.
 
Zdman said:
Zdman wrote:

You either need to be pressing DOF preview or change the camera to video mode and set video to manual. You can then select the aperture and the lens will actually change to that aperture.
Click to expand...
Zdman said:
rudeboymcc wrote:

The aperture on the lens is changed when it's taking a photo. Otherwise it's wide open I think.

Try in M mode, set the aperture to what you want, and the shutter speed to 3 seconds. Then take the lens off while it's taking the photo (this works on my nx10).
Click to expand...
Works. Thank you.
 
Ok, it seems I'm the only one here who has no idea why you want to do that? So let me ask, why do you want to do that? Obviously you have a good reason everyone else seems to be in on, but I have no idea how or why that'd ever be useful.
 
A Fool said:
A Fool wrote:

Ok, it seems I'm the only one here who has no idea why you want to do that? So let me ask, why do you want to do that? Obviously you have a good reason everyone else seems to be in on, but I have no idea how or why that'd ever be useful.
Click to expand...
I use it for Reverse Lens Macro http://digital-photography-school.com/reverse-lens-macro-close-up-photography-lesson-3

Now I have 45mm and 30mm lenses, a 45mm+30mm Reverse Lens provides 2x magnification and focus distance is 2cm, that is possible for still life handheld shot.
 
Ky Nam said:
Ky Nam wrote:
Ky Nam said:
A Fool wrote:

Ok, it seems I'm the only one here who has no idea why you want to do that? So let me ask, why do you want to do that? Obviously you have a good reason everyone else seems to be in on, but I have no idea how or why that'd ever be useful.
Click to expand...
I use it for Reverse Lens Macro http://digital-photography-school.com/reverse-lens-macro-close-up-photography-lesson-3

Now I have 45mm and 30mm lenses, a 45mm+30mm Reverse Lens provides 2x magnification and focus distance is 2cm, that is possible for still life handheld shot.
Click to expand...
What reverse lens adapter do you use?
Did you have to use some kind of step-up/step-down ring with it?

I have the 30mm, and would love to reverse it :D
 
Ky Nam said:
Ky Nam wrote:
Ky Nam said:
A Fool wrote:

Ok, it seems I'm the only one here who has no idea why you want to do that? So let me ask, why do you want to do that? Obviously you have a good reason everyone else seems to be in on, but I have no idea how or why that'd ever be useful.
Click to expand...
I use it for Reverse Lens Macro http://digital-photography-school.com/reverse-lens-macro-close-up-photography-lesson-3

Now I have 45mm and 30mm lenses, a 45mm+30mm Reverse Lens provides 2x magnification and focus distance is 2cm, that is possible for still life handheld shot.
Click to expand...
Fascinating, thanks for the explanation. I'd of never guessed that!
 
helderjean said:
helderjean wrote:
helderjean said:
Ky Nam wrote:
helderjean said:
A Fool wrote:

Ok, it seems I'm the only one here who has no idea why you want to do that? So let me ask, why do you want to do that? Obviously you have a good reason everyone else seems to be in on, but I have no idea how or why that'd ever be useful.
Click to expand...
I use it for Reverse Lens Macro http://digital-photography-school.com/reverse-lens-macro-close-up-photography-lesson-3

Now I have 45mm and 30mm lenses, a 45mm+30mm Reverse Lens provides 2x magnification and focus distance is 2cm, that is possible for still life handheld shot.
Click to expand...
What reverse lens adapter do you use?
Did you have to use some kind of step-up/step-down ring with it?

I have the 30mm, and would love to reverse it :D
Click to expand...
Unfortunately I have no apdater.

This Coupling (Reversing) Ring should work http://www.camera-filters.com/index.php?main_page=product_info&cPath=431&products_id=6389
 
rudeboymcc said:
rudeboymcc wrote:

Aren't they both 43mm filter threads? (so you won't need a step up ring).
Click to expand...
But I found no 43mm reverse lens adapter for sale. Only 49mm, 55mm, and 58mm on eBay. Wouldn't it have to be 43mm for the 30mm lens to fit on the camera reversed?
 
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