When taking pictures using a macro lens, shallow depth of field usually mandates a rather small aperture to gain sharpness. With automatic lenses, stopping down is not a problem because the camera keeps the aperture wide open during view finding, unless you press the depth of field preview button. Only when camera is taking a picture, does it set the true aperture to whatever you set it to for exposure. However, if you ever used a manual macro lens, stopping down the lens cuts the light significantly, making it really hard to see through the view finder and focus. This is particularly hard for higher magnification macro lenses such as Canon MP-E 65mm f/2.8, Laowa 60mm f/2.8 2x and lenses on extension, etc, where it is almost impossible to focus even at f/11.
Good news is that there is a simple and easy to do DIY solution to this problem as shown above and the difference can be day and night. more …