The castle isn't quite as soft as the buildings, so this could also be a depth of field issue, a wide open long lens means very shallow DOF. Manual focus if you AF has trouble.
I agree. Your aperture was set at f/5.6 - try it at f/11 to give you better depth of field.
Hmmm...I'm not quite sure about these statements. In general, yes, a large aperture (small f-number) will give you a shallower depth of field. And, in general, a smaller aperture (larger f-number) will give you a longer depth of field. However, I think this general statement applies only to subjects that are closer to the camera.
If the subject is far far far away, you can get away with using a larger aperture (such as f/5.6) and still have a large depth of field / depth of focus.
Being the nerd I am, I went on Google Earth and measured the distance from the Polynesian Resort to the front entrance of Magic Kingdom. It's 3700 feet. The distance from Polynesian to Cinderella's Castle is about 4500+ feet.
I used an online
Depth of Field calculator (
link) and plugged in the following numbers, based on the EXIF settings for your photo:
- focal length 300mm
- f-stop 5.6
- subject distance 4000 ft, and
- Pentax camera
If I'm interpreting the results correctly, everything from the middle of the Seven Seas Lagoon (1500 ft from the camera) onto infinity should have been in focus,
even at f/5.6! So the Main Street USA train station and Cinderella's Castle should have
both been in focus.
If he had chosen an aperture of f/11, then everything from 1/3 into the Seven Seas Lagoon (984 ft from the camera) onto infinity should have been in focus.
Of course, all these calculations assume that the camera correctly focused on the subject at around 4000 feet.
Anyway, I don't have an easy answer about what happened.

However, even at f/5.6, you should have had enough depth of field to have both the train station and the Castle in focus.
BTW, Todd_H, that's a
stunning photo!