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DGMPhotography

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Uhhh... just playing around with my reversed 50mm and put my 300mm in front of it and took a picture of my computer screen... neat how lenses reverse things!

$DSC_0653.webp
 
Magnification when reversing lenses works like:

Focal length of the lens on the camera body - divided by focal length of the lens reversed onto it. (I'm unsure if this is added to the native magnification of the lens mounted onto the camera - I assume it is but for now I'm leaving it out of the maths - so the actual magnification might be slighter greater).

So for a 50mm on the body and a 300mm reversed onto it you get 50/300 = 0.167:1

Now true macro is taken as a ratio of 1:1 (size of the subject reflected onto the lens : size of the subject in real life). Half life size is 0.5:1 (typical maximum of zoom lenses with a macro feature). As a result the 0.167 you have there is a very tiny magnification and no where near macro.

Now if you put that 300mm onto the camera and reversed the 50mm onto it then you'd get a whole different experience. 300/50 = 6:1. That is a huge magnification (the most I've seen any lens go to is 5:1 and that is VERY challenging - you're down to crumbs being huge!)
 
Magnification when reversing lenses works like:

Focal length of the lens on the camera body - divided by focal length of the lens reversed onto it. (I'm unsure if this is added to the native magnification of the lens mounted onto the camera - I assume it is but for now I'm leaving it out of the maths - so the actual magnification might be slighter greater).

So for a 50mm on the body and a 300mm reversed onto it you get 50/300 = 0.167:1

Now true macro is taken as a ratio of 1:1 (size of the subject reflected onto the lens : size of the subject in real life). Half life size is 0.5:1 (typical maximum of zoom lenses with a macro feature). As a result the 0.167 you have there is a very tiny magnification and no where near macro.

Now if you put that 300mm onto the camera and reversed the 50mm onto it then you'd get a whole different experience. 300/50 = 6:1. That is a huge magnification (the most I've seen any lens go to is 5:1 and that is VERY challenging - you're down to crumbs being huge!)

Very true! I suppose it's not technically macro then, but what I did was focus on my 300's lens, not the image in the lens, so in that sense it is still a macro image through the reversed 50mm.
 

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