This was taken today with a manual lens on centre point focus. The focus point was top left of the bracket fungus where it joins the log. Hold the half-press once the focus is achieved and pan around to compose the shot. It's much easier than trying to retain the focus with an auto lens.

David

I got hold of a Pentax A 35-70mm zoom the other day and it looks very much as if the 'Profile' version is the identical animal. The knurling on the zoom ring is slightly different and the colour of the paint in the engraved numbers is different. There is no engraving on the front ring where it would say "PENTAX SMC etc etc ". Otherwise, set the two side by side and you can't tell the difference.

David J

Some basic theory for the numerate to explain please....

We all know that there is a lot of information engraved on lenses and there are more used to describe them. I understand the focus ring, the aperture ring and the DOF scale but I am endlessly puzzled by the basic descriptor (for example)" 1:2.8 50mm".
I know it is f2.8 wide open but I don't know the significance of the "1:" that precedes it. It looks like a ratio of some sort(?)
Similarly, in EXIF data you find "Aperture=" and below that, "Aperture value=". What is the difference?

C'etait ce que j'ai dit .... cinq, quatre, trois, deux, un, BANG!

Like, you mean, "10, 9, 8, 7. 6...." and so on?

No, that doesn't count, it just goes BANG! when you get to zero!

Here's an extra one - and a superb piece of kit it is too!
(Please excuse the slight dent on the filter ring at 12o'clock)

I have had this 35 - 70mm zoom lens for a long time but there is next to nothing to found regarding it. It takes lovely sharp pictures with vibrant colours (one in the gallery today - an orange coloured flower). It has an 'A' button and is a push-pull zoom with a macro feature at the long end.

The engraved name is PROFILE ZOOM 1:3.5~4.5 35~70mm

Anyone know about them (or even experience with it).

David J

There's also one from Japan at an Eye-watering £1115 or $1850.
Ebay item No 141214248782. At that price, I think he's "hopeful" !