VMC260L, STK11K
About 2.6 hours each L,R,G,B, composed as [LRGB]RGB
CCDCommander, CCDStack,Photoshop
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M51
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and on the finder image from the Palomar 48" Schmidt (right). SDSS J132940 is relatively bright galaxy at Mag 20.5 but is quite distant with z =
0.257558 corresponding to a distance of ~3 Gly/920 Mpc and a Look Back Time of ~3.0 Gy (about 22% the age of the universe).

But your mileage may vary depending on which cosmological constants you choose. . .