About focusing , minimum focusing distance and change of area of focus while zooming in .
If you are a beginner into reverse macro , you will be confused after setting the aperture and fitting the lens in reverse . " What to do next ? , Will i be able to zoom in ? , How can i focus subjects ? , What will be the minimum focusing distance ? "
So let me explain and clear each of your doubts .
> First watch this video tutorial and then go through rest of the matter .
> Which mode must i put my lens on , "A" or "M" while doing reverse macro ?
I would suggest you to set the focusing mode in "A" ( auto focus ) mode itself because if you switch it to manual mode , the lens will have very free movement rotation ( other than zooming movement ) and you will find it very difficult while shooting .
> Will i be able to zoom , while doing reverse macro on 18-55 mm lens ?
My answer is YES , you will be able to zoom while doing reverse macro with 18-55 mm , but as the name itself indicate " reverse " , the process of zooming is also reversed . Confused ?
When you are normally using a 18-55 mm lens . "18" is the wide angle , right ? and "55" is where you zoom the lens . So while reversing , its just the opposite . "55" will be the widest angle and "18" is where you zoom into ( 18 is where we get extremely close to subjects )
and that means a 18-55 mm lens become 55-18 mm while reversing.
For reference i am adding two of my photograph's .
Photo taken with 18-55 mm lens on 55 mm focal length :
Photo taken with 18-55 mm lens on 35 mm focal length :
Photo taken with 18-55 mm lens on 18 mm focal length :
> As you can see in the above images even though i shot all images in same fixed
aperture ,the area of focus is decreased towards 18 mm . So if you want very crisp image in extreme macro situation you must try either to increase aperture or do stacking.
Stacking and all editing process will be uploaded as another post .
> What will be the minimum focusing distance while doing reverse macro with a 18-55 mm lens ?
Minimum focusing distance is the shortest distance at which a lens can focus and here it depends upon , how much focal length you are on .
For example if you are on 55 mm focal length , you will have a decent working distance between lens and your subject , but when zooming toward 18 mm , you will gradually decrease the working space between lens and the subject .
I have added some photos as examples .
Minimum focusing distance when you are on 55 mm focal length ( 13 cms )
Minimum focusing distance when you are on 35 mm focal length ( 7 cms )
Minimum focusing distance when you are on 18 mm focal length ( about 5 cms )