Yep, for some old historic reason nearly all camera gear is still manufactured with the old imperial 'Whitworth' engineering threading, the two sizes are 1/4 and 3/8ths.
As this is such a course thread 'pitch' I suppose it is used to prevent thread stripping from overtightening with the light alloy inserts commonly used on body base plates.
Posted by Danny Green on April 3, 2008 at 11:38 AM
Cheers Guys
I know what you mean now so thanks Alan but I still can't get one because I can't explain it to them and there is no product code, so many thanks.
Danny
Posted by Alan Bryant on April 3, 2008 at 11:43 AM
All you got to do is explain over the phone what it does.Thats all i did, and they knew what i was on about.
Hi Danny I will make you some if you let me have a screw to copy.
Phil.
Ps any good engineering supplier will have a variety of Whitworth screws as they are still commonly used by model builders of steam trains and traction engines.
Posted by Andy Astbury on April 3, 2008 at 12:47 PM
Danny - just ring Bob Rigby and ask him for a 3/8th to 1/4 Whit reduction bushing - simple.
Discussion
11 repliesI have a P40 plate but only one size screw, I want to to fit it to the Canon 500mm IS lens and the other screw thread is bigger what do I ask for?
Danny
Rene de Heer
The discription is - BS-100 3/8" to 1/4" Brass Reducer Bushing w/ Recessed Flange
I got mine from warehouseexpress for about £2 i think
As this is such a course thread 'pitch' I suppose it is used to prevent thread stripping from overtightening with the light alloy inserts commonly used on body base plates.
I know what you mean now so thanks Alan but I still can't get one because I can't explain it to them and there is no product code, so many thanks.
Danny
All you got to do is explain over the phone what it does.Thats all i did, and they knew what i was on about.
Phil.
Ps any good engineering supplier will have a variety of Whitworth screws as they are still commonly used by model builders of steam trains and traction engines.
The codes are;
Wimberley (Code: BS-100) 3/8" to 1/4" Brass Reducer Bushing w/ Recessed Flange
Wimberley (Code: SW-100) Extra Screw
Hope this helps!
Screw £2.50 at http://www.warehouseexpress.com/product/default.aspx?sku=1017540
Code Warehouse Express: PUB2115 Code Wimberley: SW-100
Can’t find the other at the moment!
Danny
I needed one for my 500 and eventually tracked a second-hand one down in Grays of Westminster camera shop. I ended up paying £150 for it.
Okay, in truth I did get a rather nice Gitzo tripod free with it, not that I really needed it
I must be more careful with my money... I must be more careful with my money...
A