Hey, great points you make. It is all variations of auto unless you set everything manually. Thank you.

Yes, it is less than manual, but that is why you paid the big bucks for your equipment. There are reasons for everything but you are absolutely correct: "At the end of the day..."

Yours is the insulting post. If you do not wish to participate, simply do not and keep negativity to yourself, it suits you well.

Bravo, excellent explanation of Canon EF/EF-S product lines.

Say what?

ouch.

Welcome home Susan. Enjoy your stay. Your photos are the bomb!

Thank you very much for posting. Much appreciated.

Take pictures man. Don't worry about your equipment. Your equipment is fine. Enjoy yourself.

Excellent work.

The best answer I have gotten to my question came to me as a private message. I will share it with you without revealing the source. I think it answers your question as well:

"The low-down on Full frame and crop factor: Here it is in a nut shell. you have a Full frame and a crop sensor Canon you put the cameras on a tripod with say a 50mm 1.4 lens on each camera, you look through both cameras and what you will see is different. The 50mm on the full frame will give you the true field of view of that lens, the APSC body will have a narrow field of view, say that of a 75mm lens, that is what the crop sensor does. .....Now people will say the subject in the middle does not change, that may be true but when you download the file on your computer from each camera you will see the center object in the crop body will be larger than the full frame camera. Now say both cameras are 24MP , The crop body has all ready cropped the sides of the photo and kept it's 24mp, when you crop the full frame file to match the APSC camera you will lose about 12mp in that file. Also when you use the same lens and take a photo at F. 1.4 the depth of field will be different on both cameras, the full frame camera DOF will be less. As the sensor gets smaller the depth of field is grater and the field of view or angle becomes narrower. ...Hope this helps..."

BebuLamar, it doesn't follow that because I own both types, I would know the advantages and disadvantages of each, just like it doesn't follow that you use full frame because you want to use the lenses you bought for your film cameras. Not to me anyway, please explain. In my case, and with Canon DSLR equipment, I can use EF lenses on the 60D but I can not use EF-S lenses on my 6D full frame unless I use an extension.
I ask this question out of genuine interest in learning. For example, FYI, I inherited both systems with some 10 lenses both L and regular. Since I do not intend to get rid of them, soon, I want to get to the point that you suggest.
Thank you for your input and thanks also to all that contributed.

I shoot with a Canon EOS 6D as well as EOS 60D. The 6D is full frame and the 60D, APS-C.

I read much information on the merits of one versus the other. I do understand what the crop factor does in re the actual image's real estate. I have yet to read any succinct information on the best times to use one or the other and why. Help anyone. Am I the only one working about these issues?