From manual of pro 1.3.1
PhotoScan accepts the following image formats: JPEG, TIFF, DNG, PNG, BMP, PPM, OpenEXR and JPEG Multi-Picture Format (MPO). Photos in any other format will not be shown in the Add Photos dialog box. To work with such photos you will need to convert them in one of the supported formats.
and from lens manual 0.4
Supported image formats
The following image formats are supported by Agisoft Lens:
• Joint Photographic Experts Group (JPEG)
• Tagged Image File Format (TIFF)
• Portable Network Graphics (PNG)
• Portable Pixmap Format (PPM)
• Windows Bitmap (BMP)