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How to control aperture ( f/ ) of lens , while reversing ( For all dslr )

Updated: Sep 12

While reversing lens is fitted in opposite direction , so there is no electronic contact between your camera and lens . So focusing and aperture control must be done manually. Here i will explain how to control aperture of your lens manually for both Nikon & Canon dslr.


Importance of changing aperture for reverse macro :


Higher the aperture , sharper the picture will be and that doesn't mean that keeping aperture at highest value will give you a very sharp image . A perfect sharp image can be achieved on 18-55 mm lens with an aperture ranging from f/8 to f/16 ( for my Nikon 18-55 mm lens )


While talking about aperture , Aperture is generally the depth of field of our lens.

So talking in simple words when you have a very high aperture value ( ex f/22 , aperture shutter inside the lens is very closed , small circle ) you will have very less light but more area of focus.

When you are on a very low aperture value ( ex : f/1.8 ) you can see the aperture shutter inside the lens will be wide open creating a big circle inside lens , so allowing more light to pass and very low area of focus.


Please refer to the videos and explanations below ( Procedure for locking aperture in both Canon & Nikon lenses )


For Nikon users :


All Nikon lenses are equipped with a manual aperture control flap at backside of the lens

The aperture flap is generally a small metal made spring action thing . As you can see in the below video that is how we open and close aperture.


What happens inside the lens while we move this aperture flap? see below video.



As you can see the aperture changing inside the lens , that's how you control aperture while doing reverse macro.

Yes ! you need to keep a finger on this aperture flap because its a spring type and you won't be able to lock it in place.Control aperture with your index finger while capturing photos.



For Canon users :


Aside Nikon , Canon users are lucky that you can lock the aperture in any point you want and you are as well as unfortunate too ! Let me explain.


In Canon DSLR , aperture can be locked in two different ways :


1 > Using build in DOF ( depth of preview ) button , very small button located near to lens unmounting button.Usually the dof button is located to tight side bottom area as in the below picture. ( Procedure of locking aperture is stated below )


2 > Other way to lock aperture on canon camera that doesn't have a DOF button . ( All model of canon does not have depth of preview button , especially base or entry models )


So now i will explain these two methods mentioned above


First way ( for canon dslr with a dof button )


First set the aperture you want with 18-55 lens normally mounted ( here i am setting to f/14 )


> After setting the aperture you need , without switching off the camera

press and hold the DOF button ( aperture opens to f14 ) and remove the lens ( NB : you have to press and hold the dof button while removing the lens ). The aperture will get locked onto the value you set ( here f/14 ).


How do we confirm that our lens aperture got locked or not?


So , to confirm that our lens aperture got locked to the value we set there is a way.

Refer to the video below.




> As in this video , aperture is set to F/5 and this is a very low value aperture , so you can see the aperture shutter inside the lens is wide open . That means lens aperture got locked onto F/5 and as a result very wide opening is seen inside lens. ( less value aperture results in less area of focus and more light )


In this below video we are going to check what happens inside lens if we lock aperture onto F/14


As in the video , you can clearly see that aperture got locked onto F/14 and as a result very narrow opening is only seen inside the lens. ( F/14 is high value aperture and will result in more area of focus and less light. )


Hence in this way you can double check if your lens aperture got locked or not.


> After the aperture of the lens gets locked , mount the lens in reverse .


Second way ( for canon dslr without a dof button )



> In the above video , you will get to learn how you can lock aperture for a Canon dslr without a dof button.


> After the aperture of the lens gets locked , mount the lens in reverse .


Both the canon videos were contributed to this website by my friends Akhil & Jay , as i dont own a Canon dslr and we are in between a global pandemic . Thanks a lot guys.


#reversed #macro

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