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Field Flattener


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OVL Field Flattener X1 with focal ratios around f/5.5 to f6.0. 

hi 

    I’ve bought a OVL Field Flattener X1 with a focal ratio around F/5 to F6.0 hopefully for my Altair starwave 70ED

as I want to use my SLR  fujifilm camera onto. I understand I now need a  lens mount adapter. Does this have to have a stated mm width to allow for a space between camera and field Flattener ? This may sound all wrong or I may have to return it if it’s not the right one. I’m steadily attempting to work my way through unfamiliar grounds of  the Astro world

thanks

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1 hour ago, Ukjonathan said:

OVL Field Flattener X1 with focal ratios around f/5.5 to f6.0. 

hi 

    I’ve bought a OVL Field Flattener X1 with a focal ratio around F/5 to F6.0 hopefully for my Altair starwave 70ED

as I want to use my SLR  fujifilm camera onto. I understand I now need a  lens mount adapter. Does this have to have a stated mm width to allow for a space between camera and field Flattener ? This may sound all wrong or I may have to return it if it’s not the right one. I’m steadily attempting to work my way through unfamiliar grounds of  the Astro world

thanks

The standard backfocus is usually 55mm from the edge of the field flattener to the focal plane of the camera. You might need a spacer or two to achieve the 55mm.

 

Back_Focus_Spacing_1024x1024.thumb.jpg.26c847867dd1094a710d4038a5bfda0a.jpg

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