Shot into daffodil 'trumpet', bellows set to minimum extension, with reversed 50mm lens:

Stack of 10 images, deliberately out of focus edges.
Zoom to maximum extension...

stack of 11 images.
No-resize Crop of the previous image..

Both shot with my usual setup; E-330, OM Bellows, OM50/1.8 reversed, twinflash. Shot at f5.6