Diopter eyepieces?

Apologies, I'm just getting started in the Sigma world with an SD14. The manual mentions getting a diopter eyepiece if the built in adjustment isn't enough. Given that I use a -3 on my Canon 80d and should probably find a -4, I'm assuming I'll need a relatively similar range for the SD14 as well. But I can't find them? There's probably something obvious I'm missing; I see posts about some Olympus eyecups being compatible?

Teneg wrote:

Apologies, I'm just getting started in the Sigma world with an SD14. The manual mentions getting a diopter eyepiece if the built in adjustment isn't enough. Given that I use a -3 on my Canon 80d and should probably find a -4, I'm assuming I'll need a relatively similar range for the SD14 as well. But I can't find them? There's probably something obvious I'm missing; I see posts about some Olympus eyecups being compatible?

Welcome, @Teneg ... do you have a name?

Found this:

"Specific to camera eyepieces: The ground glass focusing screen is just millimeters away from the viewfinder eyepiece as is the data displayed on the reticle. To facilitate comfortable viewing, the camera’s eyepiece is fitted with a magnifying lens. The focal length of this eyepiece lens is adjusted so that the light rays from the ground glass and reticle exit as parallel. In this way, the eye/brain is fooled to discern this view as if it comes from a far distance (infinity ∞). On fine cameras, the position of the eyepiece as it relates to the ground glass and reticle is a variable. The so-called diopter adjustment simply alters the air-spacing of eyepiece to the ground glass / reticle. This adjustment permits fine tuning for individuals that are near or far sighted (within limits). The diopter scale associated simply provides equivalent diopter values that are loosely related to the power of corrective reading glasses."

Says Alan Marcus here .

I am short-sighted but don't wear glasses when looking through the viewfinder. I do use a +1.34 diopter attached to the viewfinder but only to magnify the view, not to alter the diopter setting. I might be able to test how that diopter affects the diopter adjustment if that would help ...

Changing out the eyepiece sounds like no fun at all, I'd likely break something.