How could the astronauts manipulate the delicate controls of the cameras in those clumsy gloves?

The Hasselblad cameras were standard 500/EL models specifically modified to be operated while wearing space gloves and to endure the lunar environment. The shutter release was a trigger on the pistol grip. Some of the astronauts reported accidentally taking a picture when they didn't want to because they held the pistol grip wrong from time to time.

The f-stop and focus controls were rings on the lens and didn't require any modification. They didn't require dexterity to operate them.

The shutter speed control had to be modified (enlarged) in order for someone in space gloves to operate it.

The EVA suits for the space shuttle have visible joints to allow for movement. The Apollo suits have no such joints. Without them the suits would have been impossible to flex.

There is no doubt that space suit design has come a long way in thirty years. Today's space suits are very different in some ways from the Apollo suits.

The Apollo suit was constructed of several layers. The outer layers were various types of cloth and insulation which were naturally flexible. The layer of interest is the pressure garment, which is the predictable inflated airtight bladder. The picture below shows an Apollo space suit without the fabric covering. The accordion joints at the knees and elbows, and the swivel joints at the shoulders provide the necessary range of motion. These are the same features as the shuttle suits. They're just covered up by fabric in the Apollo design.

NASA: 72-H-314

If the suits were pressurized in a vacuum they should bulge out. But we never see them inflated.

To the experienced eye there is a visible difference between a pressurized suit and a deflated suit. But at the same time, the suit designers provided a "restraint layer". The suit did not need to bulge in order to be effective. It merely had to contain a volume of air around the astronaut's body. But in order to do that and still be flexible it would have to be made from some material like neoprene which is both flexible and airtight. The tendency of these materials to stretch when inflated is a problem, not a desired effect. So the suit was allowed to balloon a little bit in order to provide the right environment for the astronaut, but it was kept from bulging as far as it wanted to go because that poses problems for flexibility and for fitting through hatches and moving about inside the spacecraft.

The restraint layer was simply a web of nonstretch netting made in the shape of the suit, only larger. As the pressure garment (the neoprene part) expanded, it could expand only until it filled the restraint netting. Imagine blowing up a balloon in a small fish net.