Free ND Filter Vignetting & Focal Length Calculator—
gemini-3.0-flash
gemini-3.0-flashCalculate if stacking ND filters will cause vignetting on your lens. Use our free tool to find the minimum focal length to avoid dark corners in your photography.
What This App Does
Calculate if stacking ND filters will cause vignetting on your lens. Use our free tool to find the minimum focal length to avoid dark corners in your photography. — generated by gemini-3.0-flash and published by @Akhenaten on Slopstore. Categorized under Utility, this app is part of Slopstore's curated collection of AI-generated tools and experiments. Run it free in your browser. No installation needed.
AI Generation Prompt
ND Filter Stack Vignetting & Focal Length Warning Tool
Overview
A clean, professional, browser-based utility for photographers and cinematographers to calculate whether stacking Neutral Density (ND) filters will result in mechanical vignetting. This tool removes the guesswork from field equipment choices by providing real-time visual and text-based feedback on focal length safety.
Technical Implementation Rules
- Architecture: Single-file HTML/CSS/JS. No backend. No external frameworks like React or Vue.
- State Management: All inputs and calculations must reside in-memory. Strictly NO
localStorage,sessionStorage,IndexedDB, or cookies. - Environment: Must function perfectly within a sandboxed iframe. No
alert(),prompt(), orconfirm(). - Visuals: Vibrant, professional light-mode aesthetic. Use CSS variables for consistent colors.
UI Layout
- Header: Clean, minimalist title "ND Filter Vignetting Calculator" with a brief tag line.
- Main Content Area (Two-Column Layout):
- Left Panel (Configuration): Interactive inputs for:
- Sensor Size (Dropdown: Full Frame, APS-C, M4/3).
- Focal Length (Slider + Input: 10mm - 200mm).
- Number of Filters (Stepper: 1-4).
- Filter Thickness (Input: in mm, default 3mm per filter).
- Lens Diameter (Select: 49mm, 52mm, 67mm, 77mm, 82mm, etc.).
- Right Panel (Visualization):
- Dynamic SVG Diagram: A real-time visual representation showing the "Light Cone" vs. "Filter Stack Depth".
- Safety Status Indicator: A high-contrast badge (Green: Safe, Yellow: Caution, Red: High Risk).
- Dynamic Summary Text: "You are likely to experience [None/Minor/Heavy] vignetting at [X]mm."
- Left Panel (Configuration): Interactive inputs for:
Color Palette
- Background: #F8FAFC (Cool Grey White)
- Cards/Containers: #FFFFFF with subtle drop shadows (
0 4px 6px -1px rgb(0 0 0 / 0.1)) - Primary Blue (Actions): #2563EB
- Safety Green: #16A34A
- Caution Yellow: #CA8A04
- Warning Red: #DC2626
- Text: #1E293B (Primary), #64748B (Secondary)
Features
- Smart Warnings: Automatically suggests the minimum focal length required to avoid vignetting given the current filter stack.
- Visual Feedback: The SVG diagram updates instantly as the user moves the focal length slider, allowing for an intuitive understanding of the physical optics.
- Unit Preservation: Handles multiple sensor types, ensuring the "Field of View" calculation is accurate for the specific camera system (Crop Factor math).
- Responsive UI: The two-column layout stacks vertically on mobile devices, ensuring the inputs and the diagram are always accessible.
- Micro-Interactions: Smooth CSS transitions for all UI elements. Input changes trigger rapid re-calculation without page refreshes.
Developer Guidelines
- Use
box-shadowandborder-radius: 8pxto give a modern SaaS look. - Use SVG for the diagram to ensure it scales perfectly on all screen resolutions.
- Ensure all calculations are event-driven (
inputevent listeners) for immediate feedback.
Spread the word
gemini-3.0-flashFiles being used
Frequently Asked Questions
Everything you need to know about using this application.
Why do stacked ND filters cause vignetting?
Vignetting occurs when the physical thickness of a filter or a stack of filters creates a tunnel effect that obstructs the lens's field of view. When you stack multiple ND filters, the total depth increases significantly, pushing the physical frame of the filter into the capture area, especially on wide-angle lenses. Our calculator determines whether the combined thickness of your filter stack relative to your lens's focal length and sensor format falls within the safety threshold. By inputting your specific equipment data, you can predict potential optical obstruction before you head out on a shoot.
How does this vignetting calculator determine risk?
The application uses trigonometry based on your sensor format (crop factor) and focal length to calculate the effective angle of view of your lens. It then models the light cone as it passes through the aperture and compares it against the total depth of the filter stack. If the angle of the light path at the edge of the frame exceeds the clearance provided by the filter diameter, the tool flags a warning. It provides real-time feedback, categorizing your setup as 'Safe,' 'Marginal' (soft vignetting), or 'High Risk' (visible dark corners).
Can this tool account for variable ND filters?
Variable ND filters are generally thicker than standard fixed-stop circular ND filters because they contain dual-polarizing elements. To use this calculator with a Variable ND, ensure you input the specific manufacturer's thickness for that filter, which is often found in the product specifications. Keep in mind that variable ND filters can also introduce additional issues like 'X' cross-polarization patterns at wide angles, which are distinct from mechanical vignetting. This tool specifically addresses the mechanical obstruction caused by the filter stack depth.
Is this tool reliable for all lens types?
This calculator provides a high-accuracy estimation for standard circular screw-on filters and their impact on common lens focal lengths. However, it serves as a guideline tool rather than a perfect replacement for real-world testing with your specific glass. Lens design, particularly the position of the front element relative to the filter thread, varies between manufacturers. We recommend using this tool to identify risk areas, but always verify your specific lens-filter combination by shooting a test shot of a plain wall at the widest aperture to confirm final results.
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