Dioptre correction lens

Hi,

My eyes have fairly bad astigmatism and being old I can also not focus on close objects. My understanding of the built in dioptre adjustment, K200D is that it compensates for close focusing and this works for me but I still can not get a crisp image of the focus screen markings.

Has anyone had any experience with a prescription dioptre lens on a DSLR camera, I know they used to be used on film cameras which did not have a dioptre adjustment built in.

I'm wondering if there will be a conflict between the two adjustments and whether or not I will have to remove the original built-in lenses from the K200D

Greg

It may be convenient for you to use your reading glasses to focus with older cameras. That can work out just about spot on. They will probably need to be dedicated reading glasses.

Hi John,

I'm actually trying to improve the definition on my K200D, the adjustable dioptre can not be adjusted to suit my eyes and using reading glasses is a pain.

Greg

Then the Pentax correction lenses M are the answer, or just the empty holder for your optician to make a customised lens for it.

I would give Chris at SRS a ring and see what is available. If nothing is available, then eBay is a source from time to time.

You have two separate problems: long-sightedness and astigmatism.
Reading glasses can correct the first (and they really are a pain).
You need an opthalmic optician to fix the second.
You need the correction lens holder and the optician.
Noting where you are (like a long way from SRS) I would contact your local target shooting club and ask them for the name of an optician who provides lenses for shooting glasses.
If reading glasses work (even though they are a pain) they can provide the basic prescription for close-up work, and an ordinary optician should be able to take that, and establish the degree and orientation of your astigmatism, and then provide a lens to fit the holder.
Just remember to do your testing with the camera diopter adjustment set in the middle of its range of travel - then you can still fine-tune.
Geoff

Hi,

Thanks, I have taken an eye cup which can hold a correction lens, to my optician and they are going to fit my prescription lens. I have told them to mark the top of the lens with a notch so that if I ever remove it from the eye-cup I can reorientate it correctly.

I was concerned that the cameras adjustable diopter and the prescription lens would clash and will follow your advice.

Greg