Prompt Reference - Black Forest Labs

Camera & Lens Cheat Sheet

Term	Effect
f/1.4 – f/2.8	Blurry background (shallow depth of field)
f/8 – f/16	Everything sharp (deep depth of field)
24mm	Wide angle — shows more of the scene
35mm	Natural, documentary-style perspective
50mm	Eye-level, neutral perspective
85mm	Portrait-ideal, slight background compression
135mm+	Telephoto — strong background compression
ISO 100	Clean image, low noise
ISO 1600–3200	Brighter but grainy — useful for film-style looks
Macro lens	Extreme close-up detail
Anamorphic lens	Widescreen cinematic look with oval bokeh

Lighting Keywords

Term	Effect
Golden hour	Warm, soft, flattering — just after sunrise or before sunset
Blue hour	Cool, moody — just before sunrise or after sunset
Overcast	Flat, even, shadow-free — great for product shots
Rembrandt lighting	Dramatic triangle of light on the face
Split lighting	High contrast, half-face illuminated
Chiaroscuro	Strong light/shadow drama
Backlit / rim light	Subject glowing at the edges
Soft box / key light	Studio, controlled, even
Practical lighting	Light sources visible in the scene (lamps, neon, fire)
Diffused light	Soft, wrap-around, minimal shadows
Harsh direct light	Strong shadows, high contrast

Example lighting phrases:

Style Keywords

Category	Keywords
Photographic	”shot on Kodak Portra 400”, “35mm film”, “IMAX camera”, “Sony A7IV”, “Hasselblad X2D”, “Canon 5D”
Cinematic	”cinematic”, “anamorphic lens flare”, “teal and orange color grading”, “film noir”, “Roger Deakins cinematography”
Artistic	”oil painting”, “watercolor”, “pencil sketch”, “impasto texture”, “Art Nouveau”, “Bauhaus”
Digital art	”concept art”, “matte painting”, “octane render”, “unreal engine”, “stylized 3D”
Illustration	”flat design”, “vector illustration”, “comic art”, “anime style”, “graphic novel”, “whimsical”
Vintage	”80s vintage photo”, “2000s digicam”, “VHS aesthetic”, “polaroid”, “sepia tone”

Composition Techniques

Technique	When to Use	Example Phrase
Rule of thirds	Natural, balanced framing	”composed using rule of thirds”
Leading lines	Guide the eye through the image	”diagonal lines leading to main entrance”
Foreground/background layers	Add depth and dimension	”strong foreground boulder, background mountains”
Low angle (worm’s eye)	Make subjects powerful and dominant	”low angle worm’s eye view, dramatic diagonal lines”
High angle (bird’s eye)	Show patterns and spatial relationships	”bird’s eye view, geometric patterns of city blocks”
Dutch angle	Tension and psychological unease	”dutch angle, psychological tension”
Symmetrical	Formal, balanced, architectural	”perfectly symmetrical composition”
Negative space	Minimal, focused, product	”minimalist composition with generous negative space”

Model-Specific Quick Reference

FLUX.2 [pro] & [max]

No negative prompts supported
Excellent typography — use quotation marks for exact text
HEX color codes for brand-precise color matching: "in color #FF5733"
JSON structured prompts supported for production workflows
Reference specific camera models for authentic photorealistic looks

See: JSON Prompting → · Typography & Design → · HEX Color Prompting →

FLUX.2 [klein]

What you write is exactly what the model receives
Write in prose, not keyword lists — describe scenes like a novelist
Lighting descriptions have the highest single impact on output quality
Supports image editing with single and multi-reference inputs
Add Style: [style]. Mood: [mood]. at the end for consistent aesthetics

See: Single-Reference Editing → · Multi-Reference Editing →

FLUX.1 Kontext

Specify what should change — the input image provides all other visual context
Use quotation marks for text editing: Replace 'joy' with 'BFL'
Be explicit about preservation: “while maintaining the same facial features and hairstyle”
Prefer specific verbs: “change the clothes” over “transform the person”
For multiple changes, add as many explicit details as possible

Technical Parameters