Panasonic ET-DLE450 Long-Throw Lens for 30 Models: PT-FRZ580C, PT-FRZ680C, PT-FRZ99C, PT-FRZ78C

Panasonic Original Lens ET-DLE450 is an original optical accessory for Panasonic professional projectors. It is a long-throw (Long Throw) lens with a throw ratio of 5.36-8.58:1, designed for a 0.67-inch 1DLP panel. The manufacturer's official compatibility list covers 30 models; before installation, simply verify the projector model and panel size, with no need for adapter rings or improvised fitting. The value of an original lens lies not in the extra figures on a specification sheet, but in the fact that it is calibrated at the factory to the optical path and lens mount of that projector series. Once fitted, the image circle, edge illumination, and focusing travel all meet their design values, so keystone correction is not needed to compensate for image quality.

I. Lens Specifications

The above specifications are based on the manufacturer's official specifications. Mechanical dimensions, flange distance, and mount type are not shown in the specifications table; please provide your projector model so we can verify them. Ordering based solely on a similar model number carries the risk that the lens will not fit.

II. Calculating Installation Distance from Throw Ratio

A throw ratio is the ratio of the installation distance to the image width. This original zoom lens (5.36-8.58:1) provides a distance range for each image size, and it can focus anywhere within that range.

These distances are the clear distance from the front of the lens to the screen and do not include space for rear projector ventilation and cable connections. Calculations are based on a 16:10 aspect ratio; actual distances should be confirmed by on-site measurement and against the manufacturer's manual.

Image performance differs at both ends of the zoom range: at the short end, the image is brighter and the edges are slightly softer; at the long end, the edges are sharper and brightness decreases slightly. Where venue conditions permit, use the middle of the range. After installation, find the sharpest setting on the focus ring first, then fine-tune the lens shift.

III. Compatible Models (30 Models)

The table below is taken from the manufacturer's official compatibility list. Brightness and resolution are populated from the model database; unavailable data is shown as “—” rather than estimated.

For models not on the list, please send us photos of the projector nameplate and the existing lens so we can verify compatibility. Projector platforms of the same generation often share the same lens mount, but ordering based on model similarity is not worth the risk.

Throw Ratios by Projector Series

The same ET-DLE450 has different rated throw ratios across the series listed below, so the value must be selected based on the projector series in use.

IV. Three Checks Before Replacement

• The panel size must match. ET-DLE450 is designed for a 0.67-inch 1DLP panel. Even if the lens can be mounted, projectors with a different panel size or resolution may experience problems with the image circle and edge illumination.
• Calculate the installation distance first. The rated throw ratio of this lens is 5.36-8.58:1; use the table in Section II to match it to your venue dimensions. A fixed-focus lens offers no adjustment margin, and even a zoom lens should allow 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the lens mount of the relevant projector series. After installation, you must hear it click as it locks into place. A skewed image or soft edges are usually caused by incomplete locking, not by a defect in the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the existing lens nameplate. Verification against the physical items is the most reliable approach.