I took the picture of this tulip petal in 1994 with Leica M6 with Visoflex II mirror housing and f:3.5 65 mm Elmar macro lens with two extension tubes. Only natural ligth was used, with black background. The exposure was 1 whole second and tried bracketing half stops in both directions around the indicated f:8.

The moon is from my collection of moons shot long ago with Pentax LX and Hoya 100-300 mm zoom and the two exposures were combined by copying the slides into a single frame using a bellows and TTL flash. By the way, the original exposure for the moon was determined so that I read from somewhere that the exposure for the moon with Kodachrome 64 is 1/60 s at f:11 and with Kodachrome 25 it is 1/125 and f:8 with slight underexposure. Yes - I know that the exposures are identical, but thatīs what I read and I wrote it down on a piece of paper that I still have. As I used Fujichrome 100 - as almost always - the exposure was 1/250 at f:11, with slight underexposure as predicted. Of course you have bracket a little but this is a very good starting point - the shots made with autoexposure were hopeless, all completely washed out even with 2 stops of underexposure dialed in.