Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
GeorgeFC
member
Reged: 03/27/09
Posts: 15
|
A new focussing mask
03/27/09 01:38 PM
|
|
|
I started using a Bahtinov mask last December and found it invaluable. At times I found it difficult to judge the exact point at which the central spike was midway between the other two spikes.
After some experimentation I came up with this design.
Instead of a central spike, this mask generates two 'X' shapes which are symmetrical when perfect focus is reached. Any error in focus causes an asymmetry which is very obvious to see. The shape of the asymmetry indicates which way to alter focus.
Please have a look at this webpage for a clearer explanation.
http://www.btinternet.com/~gfcarey/careymask.htm
I welcome your feedback and/or questions.
Thanks,
George
|
|
11 registered and 7 anonymous users are browsing this forum.
Moderator: Charlie Hein, knuklhdastnmr
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Rating:
Thread views: 1332
|
|
|
|
|
|
|
Previous
Index
Next
Flat
Edit
Reply
Quote
