Panasonic ET-C1U100 Ultra Short Throw Lens: Compatible with 16 Models Including PT-REQ15C

Panasonic Original Lens ET-C1U100 is a genuine optical accessory for Panasonic professional projectors. It is an ultra short throw lens with a throw ratio of 0.308-0.330:1, designed for 0.8" 1DLP panels. The original compatibility list covers 16 models; before installation, simply verify the projector model and panel size — no adapter rings needed. The value of an original lens isn't a few extra rows of numbers on a spec sheet, but the fact that it is calibrated at the factory to the optical path and mount of that series: once installed, the image circle, edge illumination, and focus travel all match design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Panasonic
Lens Model	ET-C1U100
Throw Ratio	0.308-0.330:1
Product Type	Ultra Short Throw
Compatible Panel	0.8" 1DLP
Covered Models	16
Warranty	12 months; non-human damage is eligible for after-sales service, based on the date on the shipping document

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange focal distance, and mount type not shown in the spec table, please verify with us against your projector model — ordering based on a similar model number carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

Throw ratio is the ratio of installation distance to image width. This original lens is zoom (0.308-0.330:1), so the same image size corresponds to a range of distances; as long as installation falls within this range, focus can be achieved.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 0.66 – 0.71 m
120 inches	2.58 m	Approx. 0.79 – 0.85 m
150 inches	3.22 m	Approx. 0.99 – 1.06 m
200 inches	4.30 m	Approx. 1.32 – 1.42 m

The above figures are the clear distance from the lens face to the screen, excluding rear ventilation and cabling space. Calculated for 16:10 aspect ratio; actual values are subject to on-site measurement and the original manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the near end the image is brighter with slightly softer edges; toward the far end the edges are sharper with slightly reduced brightness. Where space permits, we recommend landing in the middle of the range; after installation, first find the sharpest position on the focus ring, then fine-tune the shift.

3. Compatible Models (16)

The table below is taken from the original compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable, without speculation.

Model	Brightness	Resolution
PT-REQ15C	15000 lumens	4K, 3840 x 2400
PT-REQ12C	12000 lumens	4K, 3840 x 2400
PT-REQ10C	10000 lumens	4K, 3840 x 2400
PT-REQ80C	8000 lumens	4K, 3840 x 2400
PT-REZ15C	15000 lumens	WUXGA, 1920 x 1200
PT-REZ12C	12000 lumens	WUXGA, 1920 x 1200
PT-REZ10C	10000 lumens	WUXGA, 1920 x 1200
PT-REZ80C	8000 lumens	WUXGA, 1920 x 1200
PT-REQ15	15000 lumens	4K (3840 x 2400)
PT-REQ12	12000 lumens	4K (3840 x 2400)
PT-REQ10	12000 lumens	4K (3840 x 2400)
PT-REQ80	8000 lumens	4K (3840 x 2400)
PT-REZ15	15000 lumens	WUXGA (1920 x 1200)
PT-REZ12	12000 lumens	WUXGA (1920 x 1200)
PT-REZ10	10000 lumens	WUXGA (1920 x 1200)
PT-REZ80	8000 lumens	WUXGA (1920 x 1200)

To check whether models outside the list can be used, please send us photos of the projector nameplate and the existing lens for verification — same-generation platforms often share mounts, but ordering based on a similar model number is a risk not worth taking.

Throw Ratios Across Model Series

The same ET-C1U100 mounted on the following series does not have the same nominal throw ratio; selection should be based on the actual series of your projector.

Model Series	Throw Ratio
—	0.308-0.330:1

4. Three Things to Confirm Before Replacement

• Panel size must match. The ET-C1U100 is designed for 0.8" 1DLP panels. For projectors with a different panel size or resolution, even if the mount fits, the image circle and edge illumination will suffer.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.308-0.330:1; apply it to your venue dimensions using the table in Section 2. Prime lenses have no margin, and even with zoom you should allow 10–20 cm at both ends.
• Check the mount and locking. The original lens is calibrated to the mount of that series; after installation you must hear it lock into place. Image skew and soft edges are usually caused by incomplete locking, not by the lens itself.

If unsure, take one photo of the projector nameplate and one of the existing lens nameplate and send them to us — verification against the actual hardware is the safest approach.