New member

smbooth
Posts: 405
Joined: 29 Jul 2012, 00:20

Re: New member

Postby smbooth » 08 Nov 2012, 11:03

Ray, when you say simple lens, what do you mean? It looks like the lens is mounted into some PVC pipe. I have a +4 dipole closeup filter which is interesting, although have not used it other than a quick test, but it covers 8x10;185mm focal length.

Ray Heath
Posts: 146
Joined: 15 Oct 2012, 13:21
Location: Lower Hunter Valley, NSW

Re: New member

Postby Ray Heath » 10 Nov 2012, 15:43

G'day all

Brian, my box cameras comprise 2 boxes which fit one inside the other. The rear box, which carries the film holder, slides inside the front box, on which is mounted the lens. Stray light cannot reach the film as light only travels in a straight line.

8x10WideAngleSlidingBoxCameraRear.jpg
8x10WideAngleSlidingBoxCameraRear.jpg (32.64 KiB) Viewed 2244 times


Shane, my lenses are called simple not because they are simplistic in manufacture but because the term refers to a lens of one element. Single element lenses are inherently poor photographic lenses becuase they have various faults or what are termed aberrations.

I use various 90mm plastic storm water pipe fittings to build and mount my lenses.

SimpleLensComponents.jpg
SimpleLensComponents.jpg (51.57 KiB) Viewed 2244 times


From my understanding of the maths, the D strength/measurement of a lens is in relationship to 1000. So, a +4D (D=dioptre?) lens would have a focal length of 250mm i.e 1000 divided by 4 equals 250.

2007-09_BottleFlower.jpg
2007-09_BottleFlower.jpg (63.92 KiB) Viewed 2244 times
Ray

Frank Meadow Sutcliffe's photographs are "a bridge that spans the widening gulf of time" (Michael Hiley 1979, 5).

Walter Glover
Posts: 1270
Joined: 31 Jul 2012, 22:31
Location: Leichhardt, NSW

Re: New member

Postby Walter Glover » 10 Nov 2012, 15:53

Splendid picture Ray.
Walter Glover

"We see things not as they are. We see them as we are."
Emanuel Kant


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