Lucid Dream FX Filter Buying Guide: Pick the Right Size
By Prism Lens Fx | Published: 2026-10-16
Category: Buying Guides
Choose between the 4x5.65 matte box filter and screw-in Lucid Dream FX sizes, plus how to avoid the wrong mount and duplicate buys.
Quick answer
Buy the 4x5.65 Lucid Dream FX Filter if you shoot with a matte box and want the strongest, softest dream effect this line offers, and buy one of the screw-in Lucid Dream FX sizes only after checking your lens thread. If you own several lenses with different thread sizes, a single 4x5.65 filter usually costs less than buying the same look in multiple screw-in sizes.
Screw-in or 4x5.65: decide the mount first
The Lucid Dream FX line is sold in two mount families: screw-in rotating filters and a 4x5.65 matte box filter. Screw-in versions are listed in 49mm, 52mm, 58mm, 67mm, 77mm, 82mm and 95mm, so they attach directly to a lens with that filter thread. The 4x5.65 version slides into a matte box instead, which means it can be shared across lenses as long as your matte box accepts 4x5.65 trays.
That difference drives the whole purchase. A screw-in filter is faster to fit on a single lens and needs no rig, but it only fits lenses with the same thread. A 4x5.65 filter needs a matte box and tray, yet it avoids buying the same effect again every time you change lenses.
Match the size to your lens thread, not to your camera
Screw-in filter sizes refer to the lens filter thread, not the sensor size or the lens brand. Check the marking on the front of the lens or the lens cap, then buy that exact size. A 77mm filter will not screw onto a 72mm lens, and using step-up rings changes how the filter sits and how much of the frame it covers.
If your lens has a very small thread, remember that the Lucid Dream FX screw-in range starts at 49mm. Below that, you would need a step-up ring or a different approach. If your lens thread is larger than 95mm, the screw-in line does not list a matching size, so a matte box setup becomes the practical route.
How the look changes with size and mount
The Lucid Dream FX is described as the boldest, strongest and softest filter in the range, with a redesigned sparkle-like coating and texture that produces an enhanced dreamier effect. That description applies to the look itself, not to a specific size, so you are not choosing a weaker or stronger version by picking 77mm over 4x5.65.
What does change is handling. A screw-in filter rotates on the lens and can be adjusted quickly by hand. A 4x5.65 filter sits in a matte box, where rotation depends on your tray or holder. If you rely on turning the filter to place the effect, test that movement before you commit to a matte box setup.
When a different filter is the smarter buy
The Lucid Dream FX is a heavy soft-focus look, so it is not the right first filter for every shoot. If you want a softer, more controlled glow for portraits, the Moody FX Filter combines the Dream and Starburst looks into one filter and is listed in 52mm, 67mm, 77mm, 82mm and 95mm screw-in sizes plus 4x5.65. That makes it a useful middle ground when full Lucid Dream strength feels like too much.
If you want a vintage or nostalgic color shift rather than heavy diffusion, the Rose FX Filter pairs rose-tinted glass with the Nostalgia Filter to soften highlights and skin tones. It is listed in 67mm, 77mm and larger sizes, so it is a narrower fit range than the Lucid Dream line. Neither alternative replaces the Lucid Dream look, but both are worth considering if your goal is a gentler effect.
Decision rules for buying a Lucid Dream FX filter
- You shoot with a matte box: Choose the 4x5.65 Lucid Dream FX Filter. It is the matte box option in this line and lets one filter cover multiple lenses. Confirm your matte box accepts 4x5.65 trays before ordering.
- You shoot with one lens and no matte box: Choose the screw-in Lucid Dream FX Filter in your lens thread size, from 49mm up to 95mm. Read the thread marking on the lens front, not the lens cap or the camera body.
- You own several lenses with different threads: Compare the cost of the 4x5.65 filter plus a matte box against buying two or more screw-in sizes. If you already own a matte box, the single 4x5.65 filter is usually the simpler long-term buy. Count how many thread sizes you actually use before buying duplicates.
- You want a lighter dream effect: The Moody FX Filter combines Dream and Starburst effects in one filter, so it is a reasonable alternative if the Lucid Dream look is stronger than you need. Test the strength you want before adding a second filter to your kit.
- You want a nostalgic color shift: The Rose FX Filter mixes rose-tinted glass with the Nostalgia Filter for pink hues and softened highlights. It is listed in 67mm, 77mm and larger sizes, so check that your lens thread is covered. Choose Rose FX for color and skin-tone softening, not for heavy diffusion.
Product facts
- 4x5.65 Lucid Dream FX Filter: 4x5.65 Lucid Dream FX Filter, listed at USD 142.34 against a catalog comparison price of USD 194.99, with a sparkle-like coating and texture for an enhanced dreamier effect. This is the only Lucid Dream option built for a matte box, so it is the one to choose if you want to share the look across several lenses instead of buying multiple screw-in sizes.
- Lucid Dream FX Filter: Lucid Dream FX Filter, listed at USD 60.29 against a catalog comparison price of USD 89.99, available in 49mm, 52mm, 58mm, 67mm, 77mm, 82mm and 95mm rotating filters. The screw-in range covers the most common lens threads, but each size fits only one thread, so confirm your lens marking before ordering.
- Moody FX Filter: Moody FX Filter, listed at USD 60.34 against a catalog comparison price of USD 84.99, a collaboration with Moody Darkroom that combines the Dream and Starburst effects in one filter, available in 52mm, 67mm, 77mm, 82mm and 95mm screw-in sizes plus 4x5.65. It is a practical alternative when you want dreamy softness with starburst highlights rather than the full strength of the Lucid Dream look.
Who should buy which Lucid Dream FX filter
Best for
- Filmmakers using a matte box who want one 4x5.65 filter across multiple lenses
- Photographers and videographers with a single lens who want the strongest, softest dream effect in the line
- Creators who already own a matte box and want to avoid buying the same screw-in size more than once
Not for
- Shooters who want a subtle glow rather than a bold dreamy softness, who should look at the Moody FX Filter instead
- Users who want a vintage pink color shift, who should consider the Rose FX Filter
- Lenses with filter threads smaller than 49mm or larger than 95mm, unless a step-up ring or matte box is part of the plan
