The forum Bentley Systems francophone

Through this forum, we want to create a Francophone exchange place on Bentley Systems products.

Good humour and courtesy are of course to be given. We reserve the right to exclude members who would be contrary to the objectives pursued.

If a section does not exist and you wish to be present, ask us via the form at the bottom of the page.

Forum navigation
Breadcrumb of the forum – You are here:ForumReality Modeling: ContextCapturePhotographyPhotographs
You need to identify yourself to create messages and topics.

Photographs

Hello.

Don't forget the depth of field! To have a clear image on a wide range, the smaller the opening of the diaphragm. This creates less light and therefore longer laying times. Using a tripod is a function! In addition, the objective and ISOs are taken into account.

In addition, I give priority to depth of field (f16 to f18) I leave the sensor set itself the speed. ISOs are independent of the setting values of your reflex. The more light is needed, but there will be more grains (an ISO 200 good value).

The depth of field is indeed important. The ideal in photogrammetry is to have a clean photo at all points, which is to say that it would take a great depth of field and for that a small opening of diaphragm.

However, which says small opening also says that less light enters the device for the same time. As a result, it is necessary to have a longer laying time which may cause "blurred movement" when shooting if you hold the camera in your hand. As stated @gerald-tilmantgmail-com, it is then preferable to use a tripod.

When the camera is mounted on a vehicle (drone, car, aircraft, helicopter, etc.) it will be necessary to take this parameter into account.

I refer you to these articles which explain (without entering into too technical details) the 4 main concepts to be taken into account for photogrammetric photography: https://www.becad.net/photogrammetry/

Also, to deepen the precise topic of depth of field the Wikipedia article is provided enough: https://en.wikipedia.org/wiki/Deep de champ


Give us your opinion!