DPG is a comprehensive underwater photography website and community for underwater photographers. Learn underwater photography techniques for popular digital cameras and specialized professional underwater equipment (wide angle, macro, super macro, lighting and work flow). Read latest news, explore travel destinations for underwater photography. Galleries of professional and amateur underwater photography including wrecks, coral reefs, undersea creatures, fashion and surfing photography.
Dive Photo Guide

Introduction To Underwater Macro Photography

The classical definition of macro photography is when the image projected on your sensor is actually life size, often referred to as 1:1 (“one to one”).
If you don’t have an interest in the basic technical explanation, skip to the next section, it’s not going to make you a better photographer to understand this right now. But for those who wish to understand more about what it means to reproduce at 1:1, read on.
clownfish underwater photograph by Matt Weiss

In order to understand what 1:1 means, it is important to understand the concept of image magnification and reproduction ratio, which is determined by dividing the image height or width on your sensor, by the subject’s height or width. Here is the calculation: 

Magnification = (image height) / (subject height)  X
or expressed as a reproduction ratio:
Reproduction ratio =  image height:subject height

For example, when using a full frame sensor (36mm width x 24mm height), filling the frame with a 24mm tall subject corresponds to 1X magnification, or 1:1 reproduction ratio, since: 

magnification = 24mm / 24mm = 1X


reproduction ratio = 24mm:24mm = 1∶1

Similarly, filling the same frame with a 12mm tall subject would correspond to 2X magnification, or a 2:1 reproduction ratio. To continue the example, filling the frame with a 48mm tall subject would be 0.5x magnification, or a 1:2 reproduction ratio.

Technically macro photography is accomplished with lenses that can achieve a 1:1 or greater reproduction ratio. Close up photography is often defined as an image with a reproduction ratio between 1:4 and 1:10. However, the terms “macro” and “close-up” are often used interchangeably for practicality reasons. No one is going to measure your subject and then compare it to your sensor size to see if it’s actually a close-up or macro image. Even in competitions it does not really matter.  Additionally, any image with a reproduction ratio greater than 1:1 is said to be supermacro , as it’s greater than life size. To learn more about super macro, visit our guide to Underwater Super Macro Photography.

Continue To Equipment Guide For Underwater Macro Photography


polkardbis polkardbis
Sep 18, 2017 5:58 AM
Ordenis Ordenis
Dec 19, 2017 6:15 AM
Ordenis Ordenis wrote:
Keraldis Keraldis
Dec 20, 2017 3:07 AM
Keraldis Keraldis wrote:
Behantes Behantes
Jan 3, 2018 9:06 AM
Behantes Behantes wrote:
Werentes Werentes
Jan 9, 2018 8:30 AM
Werentes Werentes wrote:
Serden Serden
Jan 15, 2018 7:35 AM
Serden Serden wrote:
Ferlentes Ferlentes
Feb 8, 2018 2:35 AM
Ferlentes Ferlentes wrote:
Olfars Olfars
Feb 14, 2018 5:02 AM
Olfars Olfars wrote:
Irfanes Irfanes
Mar 22, 2018 6:43 AM
Irfanes Irfanes wrote:
Merfenes Merfenes
Mar 24, 2018 3:40 PM
Merfenes Merfenes wrote:
derfanes derfanes
Apr 4, 2018 2:32 AM
derfanes derfanes wrote:
refelas refelas
Apr 4, 2018 7:28 AM
refelas refelas wrote:
prefans prefans
Apr 6, 2018 6:41 AM
prefans prefans wrote:
erdanes erdanes
Apr 6, 2018 7:02 AM
erdanes erdanes wrote:
iranes iranes
Apr 18, 2018 2:51 AM
iranes iranes wrote:
gretanes gretanes
Apr 18, 2018 9:02 AM
refenis refenis
Apr 18, 2018 9:23 AM
refenis refenis wrote:
ordenes ordenes
Apr 20, 2018 3:01 AM
ordenes ordenes wrote:
erdenes erdenes
Apr 23, 2018 5:40 AM
erdenes erdenes wrote:
Pascal Erno
Jul 10, 2019 12:12 PM
Pascal Erno wrote:
Very interesting
You must be logged in to comment.
Support Our Sponsors
Travel with us

Featured Photographer

Follow Us