Mounting thread Specifications

[sloz1664]

Probably been covered numerous times but still handy.

Lens mount Threads

In photography a standardized adaption device for the changing of lenses which works independent from the manufacturer is called screw thread or lens thread. Screw threads are the forerunners of the bayonet connectors, which dominate the market nowadays. Screw threads were mainly used upto the 1980s. However, the M42-screw thread still offers a low-priced alternative to the analoguos mirror reflex camera with high-quality lenses.

M39-Screw Thread M39 x 26Gg

The M39-Screw Thread - also called Leica L-Mount - was used in miniature cameras since the 1930s. Companies that offer these mounts are e.g. Leica, Voigtländer, Canon and Ricoh. For this thread sporadically high-quality lenses are still available today.

M40-Screw Thread

The M40-Screw Thread is a quite rare thread. It was mainly used in the 1930s. E.g. the Praktiflex and Praktiflex II of the brand Praktika resp. Pentacon had this lens connection. Some CCD-camaras still use the M40-thread nowadays.

M42-Screw Thread M42 x 1.0

M42 is the term for a standardized screw thread that was used for cameras of e.g. Praktica, Voigtländer, Fujica ST, Ricoh and Pentax. M42 is the successor of the older M39-screw thread and was developped in a time when the manufacturer's didn't yet try to tie the users down to their own company's lens bayonets.

T2-screw thread M42 x 0.75

T2 is an old Tamron standard. There are multiple adapters available for T2, from T2 to other sizes and vice versa. For a number of applications the T2-mount has become standard, e.g. for microscopes, telescopes and slide duplicators.

C-Mount 1" x 32 TPI UN 2A

Standard connection of lenses for CCD-cameras, with a standard mount thread (at the lens: male thread 1"-32UN2A) with a standard flange focal distance of 17.526 mm.

CS-Mount 1" x 32 TPI UN 2A

Is equal to C-Mount apart from the standard flange focal. The CS-mount has a flange focal distance of 12.5 mm. The CS-Mount standard is the "younger" standard, which meets the demand for shorter lengths.

Tripod Threads DIN 4503 / ISO 1222

1/4" - 20 UNC or 1/4" BSW

This thread is used for rangefinder camera, roll film cameras (also DSLRs) up to medium format cameras, quick release plates and panoramic heads.

3/8" - 16 UNC or 3/8" BSW

Some medium format cameras and almost all large size cameras as well as most of the connectors between tripods and panoramic heads use this thread.

cheers

Steve

[cheb]

hiya steve, you might just be the man to ask this!

I have a digimax40T that was in the box with my secondhand etx90, it has an adapter on the end which i assume you attach a camera body to? It says on the removable ring 49mm-55mm, it is threaded and from reading above im old fashioned thinking i just screw a body onto this! So could you please help?

I was thinking of buying either the nikon D60 body or the D70s thats in wex for £89, if i was to go this route for example what would i need to buy also to make my first moves into astrophotography possible?!

Cheers,

Chris.

[sloz1664]

Hi Chris,

I'm afraid I no nothing about the digimax40T. You're best bet is to post a new thread in the

Beginners - Getting Started in Imaging Section. Stating what you have posted today (photos of the Digimax & 49mm - 55mm ring would be helpful).

Someone will certainly point you in the right direction.

cheers

Steve

[cheb]

ah ok, i posted in the camera section the same question and got lots of views but no replys, will try the imaging section.

thanks for the reply though ste.