Diopter focus inconsistency (Ed x) (1 Viewer)

[matt green]

A recent Observation with a newly acquired hawke Ed x 8x42, when focusing from near to distant objects I can achieve perfect focus but when tracking the focus back to near objects the focus/diopter setting appears out of focus,

I wonder if this is a known issue with budget made roofs, or maybe just a trade off with build quality/tolerances etc?

Matt

 

[ZeNiTh-PbArM]

Hi

This problem is common among cheaper roofs.
In the video below, look how the focuser nut has excessive backlash and tilts depending on focusing direction.
As a result, the left and right pushrods (which drive the focusing lens in each barrel) exhibit a shift relative to each other depending on focusing direction.
Most often a deadspot can be felt in the focusing wheel when changing direction.

Regards,
zp*

View attachment tect.mp4

 

[matt green]

Hi

This problem is common among cheaper roofs.
In the video below, look how the focuser nut has excessive backlash and tilts depending on focusing direction.
As a result, the left and right pushrods (which drive the focusing lens in each barrel) exhibit a shift relative to each other depending on focusing direction.
Most often a deadspot can be felt in the focusing wheel when changing direction.

Regards,
zp*

View attachment 1399108

Thanks for the reply and video, a preferable explanation as apposed to a defective binocular!

I‘m still amazed how budget roofs have progressed over the last few years, still a very fine optic for the money,

Matt