Titanium lenswas given this lens to play with

[Grahame Hamblin]

Was given this lens to play with does any one know of it.
yes called titanium   lr series super wide macro .42 times af made in Japan looks like pentax mount
any info  would be helpful
Grahame

[Birna Rørslett]

Probably some kind of dioptre attachment. Can you provide us with a photo of it?

[Birna Rørslett]

A quick google search confirmed my initial hunch. This is a frontal lens attachment with negative power thus the image field widens.

It goes without saying that concomitantly, resolution of the entire optical system declines at least to the same extent.

[Akira]

Grahame, I guess yours is this.

If so, this is a wideangle converter, as Birna noted.  It seems to come with the dedicated closeup attatchment.  Bower is the brand name also used for Samyang lenses.  "0.42x" should mean that this converter shortens the focal length of the master lens by 0.42 times.  37mm is the diameter of the filter thread of a master lens.  It could be designed for a small video camera?

[charlie]

It could be designed for a small video camera?

I do believe so, I've got a Century Optics 0.65 wide angle attachment for my old camcorder somewhere. This is how they delineate attachment lenses for video cameras.

[Grahame Hamblin]

Thanks all for your help it was hopeless so gave it back. I think he had pulled it to bits and not reassembled it correctly
Grahame

[charlie]

These types of attachment lenses will not work on their own. They are designed for cameras with fixed lenses (consumer video cameras) that can not be interchanged. As mentioned when they are mounted on the front of an existing lens it will create a wider angle of view, using it by itself on an SLR type camera does not work and will result nothing but blur. 

[Birna Rørslett]

Typically you would screw such an attachment to a "normal" lens (approx. 50mm in case of the 24x36mm format, today known as FX or 'full frame') to get a wider view. Concomitantly you got a lot of barrel distortion and other optical 'goodies'.

[Akira]

I use the similar kind of fisheye converter on my Kenko pinhole for the super-wide pinhole photography, if the setup is still entitled as "pinhole".