Agisoft Metashape

Agisoft Metashape => General => Topic started by: Julien999 on January 13, 2018, 06:13:34 PM

Title: 18mm on full frame
Post by: Julien999 on January 13, 2018, 06:13:34 PM

Hello, i would like to know if a 18mm lens on full frame is fine for photogrammatry?
I think there are deformation but is it working well?
I would like to use it inside and outside and also on drone.
I have the Sony A7R II.

Thank you

Title: Re: 18mm on full frame
Post by: 3DFranz on January 15, 2018, 11:08:27 AM

Concering that the A7r II has a integrated Picture Stabilisation, i would not recommend using it for Computer-Vision-Calculations.

Title: Re: 18mm on full frame
Post by: Julien999 on January 15, 2018, 01:30:03 PM

This sensor stabilization can affect the result in photogrammetry? How?

Title: Re: 18mm on full frame
Post by: stihl on January 16, 2018, 04:18:19 PM

Hi Julien999,

Built-in lens or sensor image stabilization can change interior camera geometry and alter interior orientation values between consecutive images when Photoscan might expect the same parameters. This in theory decreases the potentially achievable accuracy.

Title: Re: 18mm on full frame
Post by: cbnewham on January 16, 2018, 06:28:36 PM

I've carried out PG with a 17mm lens. The results are ok, but I wouldn't recommend it. Normally I use a 28mm lens (that is in the 35mm world) - either on a micro-4/3 camera or FF 35mm.

Title: Re: 18mm on full frame
Post by: Julien999 on January 21, 2018, 07:55:53 PM

Do you think it's better to use a 24mm than 18mm?