Jump to content

can diopters far and close focus charts be generalized for the same focal lenght but different sets of lenses?

davide sorasio

Recommended Posts

Hello everyone, maybe this is a silly question but it has been in my head for a while.

Once I have a close and far focus chart for a certain focal lenght, could it be used for the same focal lenght of another set of lenses that have the same T-stop when wide open? For example, shooting at the same settings on the same camera with a 75mm Master prime using a diopter +1 would give me the same far and close focus if switching to another lens with the same wide open T stop?

and if not, which are the factors that influence close and far focus on diopters except from the diopter's gradation?

Thanks in advance

Link to comment
Share on other sites

If the other lens is a 75mm Master Prime, then you would have the same near and far focus point; with another make of lens like a Cooke 75mm, however, you would have slightly different results because the entrance pupil is different. I don't think it would be dramatically different. A +1 diopter would still put your infinity at 1 meter in front of the diopter, theoretically.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...