Panasonic PT-EZ580 PT-EW640 PT-EX610 PT-EW540 PT-EX510 Formula to calculate projection distance per Projection Lens

Chapter 2 Getting Started — Setting up

Formula to calculate projection distance per Projection Lens

To use a screen size not listed in this manual, check the screen size SD (m) and use the respective formula to calculate projection distance. The unit of all the formulae is m. (Values obtained by the following calculation formulae contain a slight error.)

If you want to calculate the projection distance with projected image size SD (unit: inch) by substituting, please assign 0.0254 times to the SD value.

For PT‑EZ580

Lens type	Projection Lens	Aspect ratio		Projection distance (L) formula
Lens type	Model No.	Aspect ratio		Projection distance (L) formula
	Model No.
		16:10	Min. (LW)		L = 1.3900 x SD - 0.0549
		16:10	Max. (LT)		L = 2.3640 x SD - 0.0482
			Max. (LT)		L = 2.3640 x SD - 0.0482
Standard zoom lens	—	16:9	Min. (LW)		L = 1.4286 x SD - 0.0549
Standard zoom lens	—	16:9	Max. (LT)		L = 2.4297 x SD - 0.0482
			Max. (LT)		L = 2.4297 x SD - 0.0482
		4:3	Min. (LW)		L = 1.5736 x SD - 0.0549
		4:3	Max. (LT)		L = 2.6763 x SD - 0.0482
			Max. (LT)		L = 2.6763 x SD - 0.0482
		16:10	—		L = 0.6763 x SD - 0.0577
Fixed-focus lens	ET‑ELW21	16:9	—		L = 0.6951 x SD - 0.0577
		4:3	—		L = 0.7656 x SD - 0.0577
		16:10	Min. (LW)		L = 1.0557 x SD - 0.0555
		16:10	Max. (LT)		L = 1.4374 x SD - 0.0534
			Max. (LT)		L = 1.4374 x SD - 0.0534
Short focus zoom lens	ET‑ELW20	16:9	Min. (LW)		L = 1.0851 x SD - 0.0555
Short focus zoom lens	ET‑ELW20	16:9	Max. (LT)		L = 1.4774 x SD - 0.0534
			Max. (LT)		L = 1.4774 x SD - 0.0534
		4:3	Min. (LW)		L = 1.1952 x SD - 0.0555
		4:3	Max. (LT)		L = 1.6273 x SD - 0.0534
			Max. (LT)		L = 1.6273 x SD - 0.0534
		16:10	Min. (LW)		L = 2.3662 x SD - 0.1140
		16:10	Max. (LT)		L = 3.8583 x SD - 0.1129
			Max. (LT)		L = 3.8583 x SD - 0.1129
Long focus zoom lens	ET‑ELT20	16:9	Min. (LW)		L = 2.4320 x SD - 0.1140
Long focus zoom lens	ET‑ELT20	16:9	Max. (LT)		L = 3.9656 x SD - 0.1129
			Max. (LT)		L = 3.9656 x SD - 0.1129
		4:3	Min. (LW)		L = 2.6788 x SD - 0.1140
		4:3	Max. (LT)		L = 4.3680 x SD - 0.1129
			Max. (LT)		L = 4.3680 x SD - 0.1129
		16:10	Min. (LW)		L = 3.8667 x SD - 0.2123
		16:10	Max. (LT)		L = 6.1416 x SD - 0.2108
			Max. (LT)		L = 6.1416 x SD - 0.2108
Ultra long focus zoom lens	ET‑ELT21	16:9	Min. (LW)		L = 3.9742 x SD - 0.2123
Ultra long focus zoom lens	ET‑ELT21	16:9	Max. (LT)		L = 6.3123 x SD - 0.2108
			Max. (LT)		L = 6.3123 x SD - 0.2108
		4:3	Min. (LW)		L = 4.3775 x SD - 0.2123
		4:3	Max. (LT)		L = 6.9529 x SD - 0.2108
			Max. (LT)		L = 6.9529 x SD - 0.2108

For PT‑EW640 and PT‑EW540

Lens type	Projection Lens	Aspect ratio		Projection distance (L) formula
Lens type	Model No.	Aspect ratio		Projection distance (L) formula
	Model No.
		16:10	Min. (LW)		L = 1.4062 x SD - 0.0504
		16:10	Max. (LT)		L = 2.3944 x SD - 0.0497
			Max. (LT)		L = 2.3944 x SD - 0.0497
Standard zoom lens	—	16:9	Min. (LW)		L = 1.4452 x SD - 0.0504
Standard zoom lens	—	16:9	Max. (LT)		L = 2.4609 x SD - 0.0497
			Max. (LT)		L = 2.4609 x SD - 0.0497
		4:3	Min. (LW)		L = 1.5919 x SD - 0.0504
		4:3	Max. (LT)		L = 2.7106 x SD - 0.0497
			Max. (LT)		L = 2.7106 x SD - 0.0497
		16:10	—		L = 0.6842 x SD - 0.0572
Fixed-focus lens	ET‑ELW21	16:9	—		L = 0.7032 x SD - 0.0572
		4:3	—		L = 0.7746 x SD - 0.0572
		16:10	Min. (LW)		L = 1.0702 x SD - 0.0554
		16:10	Max. (LT)		L = 1.4530 x SD - 0.0534
			Max. (LT)		L = 1.4530 x SD - 0.0534
Short focus zoom lens	ET‑ELW20	16:9	Min. (LW)		L = 1.1000 x SD - 0.0554
Short focus zoom lens	ET‑ELW20	16:9	Max. (LT)		L = 1.4934 x SD - 0.0534
			Max. (LT)		L = 1.4934 x SD - 0.0534
		4:3	Min. (LW)		L = 1.2116 x SD - 0.0554
		4:3	Max. (LT)		L = 1.6449 x SD - 0.0534
			Max. (LT)		L = 1.6449 x SD - 0.0534

36 - ENGLISH