Table 1: Summary of scales for the "typical'' lensing case ( $z_{\rm L} \approx 0.5$ , $z_{\rm Q}\approx 2$ ) and for the special case of Q2237+0305 ( $z_{\rm L}\approx 0.039$ , $z_{\rm Q} \approx 1.69$ ).
typical lensed quasar case lensed quasar Q2237+0305

Physical Einstein radius in quasar plane $R_{\rm E}$ $3.2 \times 10^{16} \sqrt{M/M_\odot} ~h_{75}^{-0.5}$ cm $1.6 \times 10^{16} \sqrt{M/M_\odot} ~h_{75}^{-0.5}$ cm

Angular Einstein radius $\theta _{\rm E}$ $2.2 \sqrt {M/M_\odot} ~h_{75}^{-0.5}~\mu$ arcsec $7.3 \sqrt {M /M_\odot} ~h_{75}^{-0.5}~\mu$ arcsec

Einstein time $t_{\rm E}$ $25 \sqrt {M/M_\odot} ~v_{600}^{-1} ~h_{75}^{-0.5}$ years $8.7 \sqrt {M/M_\odot} ~v_{600}^{-1} ~h_{75}^{-0.5}$ years

Crossing time $t_{\rm cross}$ 251 R₁₅ v₆₀₀^-1 h₇₅^-0.5 days 25 R₁₅ v₆₀₀^-1 h₇₅^-0.5 days

**Table 1:** Summary of scales for the "typical'' lensing case ( $z_{\rm L} \approx 0.5$ , $z_{\rm Q}\approx 2$ ) and for the special case of Q2237+0305 ( $z_{\rm L}\approx 0.039$ , $z_{\rm Q} \approx 1.69$ ).
	typical lensed quasar case	lensed quasar Q2237+0305
Physical Einstein radius in quasar plane $R_{\rm E}$	$3.2 \times 10^{16} \sqrt{M/M_\odot} ~h_{75}^{-0.5}$ cm	$1.6 \times 10^{16} \sqrt{M/M_\odot} ~h_{75}^{-0.5}$ cm
Angular Einstein radius $\theta _{\rm E}$	$2.2 \sqrt {M/M_\odot} ~h_{75}^{-0.5}~\mu$ arcsec	$7.3 \sqrt {M /M_\odot} ~h_{75}^{-0.5}~\mu$ arcsec
Einstein time $t_{\rm E}$	$25 \sqrt {M/M_\odot} ~v_{600}^{-1} ~h_{75}^{-0.5}$ years	$8.7 \sqrt {M/M_\odot} ~v_{600}^{-1} ~h_{75}^{-0.5}$ years
Crossing time $t_{\rm cross}$	251 R₁₅ v₆₀₀^-1 h₇₅^-0.5 days	25 R₁₅ v₆₀₀^-1 h₇₅^-0.5 days

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