Need a 'User' or 'Operating Manual'.

Canon has several User Manuals for the SD550, as well as manuals for their software, on the product site. See http://usa.canon.com/cusa/support/consumer/digital_cameras/powershot_sd_series/powershot_sd550#BrochuresAndManuals . (If needed click on Brochures and Manuals link; then expand the Guides and Manuals section.) The full titles aren't given. It just gives the Canon product name and then User (before hiding the rest). The first one with User in the title is the Basic guide. The second one is the Advanced Guide.

I hope this helps.

Cindy Wells

You need to go to the support section of the Pentax website and engage in a live chat with a service tech using your computer or even a phone conversation to resolve your problem.

Try using another lens, if this solves the problem you have a lens problem. If not the camera is the problem.

i did not solve my problem ididnt get the correct camera it kept bringing up the one you mentioned instead of optio e35

I have old Lenses that I use; you must set your lens to manual, Switch left hand front of body. That should resolve the problem.

If you want to use the aperture ring on the lens you must enable this in the Custom settings menu. jamknight, sounds like your camera may need a professional cleaning.

First make sure the camera is not set to No Flash on the shooting mode dial.Also, in P, Tv, Av or M modes the flash reverts to manual and must be raised manually by pressing the button next to the viewfinder.

Pentax *ist DL User Manual
Pentax *ist DL Software Manual

You need a Pentax USB cable I-USB17.
You can get it online from B&H photo or Adorama camera.
I would go with B&H photo personally.

According to the manual (page 153), the DL DOES support P-TTL flash, with the built-in or external flash, but only supports high-speed flash with an external flash. What I'm wondering is, what is high-speed sync flash useful for? The only thing I can think of is fill-flash outdoors.