Causes of bad quality angiography :
• Ocular media opacities (cataract , vitreous hemorrhage , corneal scar)
• Patient movement (image out of focus)
• Dust on the camera.
• The film (out of date)
• Problem in print process.
• Insufficient Pupil dilatation (at least 6mm) specially with mydriatic cameras.
• Inadequate tear film.
in addition to checklist and preparation measures to be set, then you could have good quality angiography.
you can see this post for checklist and preparation Checklist and preparation for fluorescein angiography
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