Full Moon following the slingshot pass of the spacecraft in distress, 11-17 April 1970

Vintage chromogenic print on fiber-based paper, printed 1970, numbered "NASA AS13-60-8703" (NASA MSC) in red in top margin, with "A KODAK PAPER" watermark on verso, 25,4 x 20,3 cm, little margin tear

Following their pass over the Moon’s backside, the Apollo 13 crew had two hours before firing Aquarius’s descent engine to correct their flight path so that they could head back home.
This shot centered on a point between the sea of Fertility (right) and the Sea of Crises (left) is showing a great portion of the backside never seen from Earth. Lunar farside features including Crater Tsiolkovsky well visible at the top of picture.

“Around the Moon, when we were getting ready for this PC plus 2 burn [firing the LM’s descent rocket two hours after the craft’s closest approach to the Moon], [...] these guys [Fred Haise and Jack Swigert] were interested in looking at the backside of the Moon. I’d seen the backside of the Moon. I’m trying to make sure that that thing is going to light off when we get started.”
James Lovell (Chaikin, Voices, p.146)

From the mission transcript before the critical burn of the Descent Propulsion Engine of the LM needed to correct their flight path for the journey back to Earth:
079:06:31 Brand: Okay, Aquarius. We have some new information regarding what you should see out the commander’s window at TIG (Time of Ignition). Over.
079:06:44 Lovell: Okay. Go ahead.
079:06:48 Brand: According to calculations - calculations, you should see the Moon. It’ll be a full Moon. You should see most of the disk [...]
079:07:38 Lovell: Okay, Houston. I concur. I’m looking at 14 on the LPD and the angle is just about centered. It’s south of Crisium, but it’s - The line is just slightly to the north of center.