You mean like that you know the ornament is round but isn't?
That has to do with perspective in this case to my knowledge.
This can be dealt with, with a shift lens.

There is also that the lens cause the distortion, some software can correct that.
The types of distortions are barrel, pincushion and a mix of both is called moustache.

What card do you mean from Samsung or Transcend :

The Pentax and the Tamron 18-250 are the same optically.
The Sigma 18-250 has HSM and might focus faster but isn't as good as the other two.

Like said though these lenses are a compromise in almost everything, the 18-55 kit lens with a DA 55-300 will be better in terms of everything really.

Since you're quite new to photography you might want to try what you've now out a bit longer so that you know what lens to use in a situation and maybe even get more creative with the lens.
I had a Pentax DA 18-250 and sold that to fund the DA*50-135 which has been a far more versatile lens for me then the 18-250 was.

Thank you very much Gwyn.
Maybe I should offer them for print

Don't really think that's true though.

P mode is program mode but when you change the aperture it will go basically in Av mode and if you change the shutter speed it will go into Tv mode.
So you need to have an understanding about both to use it successfully.

If you don't know anything about f stops and shutter speeds then the green mode is the mode to use.

No not really.
You can use it as an advance auto mode and have the ability to change the settings to your liking if you think the camera is wrong.
Or
You can use it in fast changing condition, where you first want control over your DOF (depth of field) and then about your ability to freeze things with the shutter speed.
Motor racing can be such an example.

No idea...

I've seen him on the telly, he is very good ^^

Thank you Greg.
It was my plan to make a series like you suggest.
They are very slightly cropped so you should be able to print them around A2 maybe, big enough?
Just need to find some suitable flowers for the other ones

Hopefully we will see more photo-shop photos around here, it's pity how many don't even used half of the capabilities in photoshop.

But you've a Metz 48, but linked to the new Metz 44 you know, I don't believe that one is in the shops yet.

But the DC is no SDM, they are completely different type of motors and not even related.
One use magnetism and the other use piezoelectric element to create motion.