Sigma Drop-In Filter Holder for Sigma 300-600mm f/4 Sports Lens (L-Mount) - 1820023
The Sigma Drop-In Filter Holder is designed specifically for the Sigma 300-600mm f/4 Sports Lens (L Mount). It allows you to easily attach and swap out 40.5mm filters, providing versatile filter options for your photography. Perfect for enhancing your images with neutral density, UV, or polarizing filters, this holder offers convenience and compatibility for professional and avid photographers alike.
What our Experts Think
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Essential accessory for telephoto control: Designed specifically for the Sigma 300‑600 mm F4 DG OS Sports lens (L‑Mount), this drop‑in filter holder lets you use dedicated 40.5 mm filters inside the rear of the lens — crucial because front filters can’t be used on this ultra‑telephoto zoom.
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Flexible filtration options: Works with standard 40.5 mm circular filters and is compatible with Sigma’s Drop‑In Circular Polarizer and Variable ND filters (sold separately) to manage glare, reflections, and exposure without compromising optical performance.
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Compact, practical design: Rear placement keeps filters hidden and balanced, helping maintain the lens’s handling characteristics — especially useful in sports, wildlife, or long‑reach shooting scenarios.
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Seamless integration: Fits neatly into the lens’s drop‑in slot and doesn’t affect autofocus or stabilization performance, preserving the Sports line’s pro‑grade functionality.
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Value‑add for serious shooters: While simple in concept, this holder expands creative control and workflow flexibility — a smart add‑on for photographers who need on‑the‑fly filtration without bulky matte boxes or external holders.
Q&A
Q: What is the Sigma Drop‑In Filter Holder (1820023)?
A: A dedicated drop‑in filter holder designed for the Sigma 300‑600mm f/4 DG OS Sports telephoto zoom lens, enabling the use of drop‑in filters with this lens.
Q: What size filters does it support?
A: Fits standard 40.5 mm diameter circular filters, letting you add ND, CPL, or other compatible drop‑in filters to expand creative control.
Q: Which lens and mount is it compatible with?
A: Made specifically for the Sigma 300‑600mm f/4 DG OS Sports lens in L‑Mount (also compatible if the lens is in Sony E).
Q: What benefits does it offer?
A: Allows easy insertion and use of internal filters without affecting lens balance or requiring front filter access — ideal for landscape, wildlife, and outdoor shooting with polarizers or ND filters.
Q: Is the sensor affected by using the filter holder?
A: No — designed to work seamlessly with the lens’ optical path, maintaining image quality while adding creative filtering options.
Maintenance Tips
- Store in a dry, dust-free environment.
- Clean filter glass and holder with a microfiber cloth or blower.
- Avoid touching filter surfaces with fingers.
- Always attach/detach filters gently to prevent scratches.
- Check screws and locking mechanism periodically for secure fit.
- Keep spare filters in protective cases when not in use.
- Handle carefully to avoid impact or bending of the holder.
Damage 
Loss 
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