Pentax

Pentax 30736 Diopter Adjustment Lens Adapter M +1

The Pentax Diopter Adjustment Lens Adapter M +1 customizes your viewfinder to match your eyesight for sharper manual focusing.

$33.37*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Pentax Diopter Adjustment Lens Adapter M +1 (model 30736) is a small optical accessory that attaches to the viewfinder eyepiece of compatible Pentax cameras. Its purpose is straightforward: it shifts the diopter of the viewfinder by +1, compensating for mild farsightedness so that the photographer can see the focusing screen clearly without wearing corrective glasses. This is particularly valuable for manual focus work, where a sharp viewfinder image is essential for precise focus placement. The adapter is also useful on cameras that either lack a built-in diopter adjustment dial or whose built-in range does not reach the correction the photographer needs.

Installation is simple — the adapter slides onto the viewfinder eyepiece in place of the standard eyecup. It is worth noting that the eyecup must be removed and cannot be used simultaneously with this adapter, which means some shooters may find the bare eyepiece less comfortable during extended sessions. The adapter itself is extremely compact and lightweight, adding no practical bulk or weight to the camera. Photographers should verify that +1 diopter is the correct correction for their vision before purchasing, as Pentax offers these adapters in several different diopter strengths.

Key Features

Finder Accessories

Attach to the viewfinder eyepiece of a camera that is beyond the camera's aperture adjustment range or does not have a vision adjustment mechanism

Adjustable vision according to the photographer's vision Cannot be used with eyecup

Product Model Number: 30736

Brand: Pentax

Specifications

Brand
Pentax
Model
30736
Type
Diopter Adjustment Lens Adapter
Diopter Correction
+1
Mounting
Pentax K (M-series viewfinder)

Pros & Cons

👍 Pros

  • Allows photographers with mild farsightedness to see the viewfinder clearly without wearing glasses
  • Simple slip-on installation with no tools required
  • Provides a full, unobstructed viewfinder image compared to shooting with glasses pressed against the eyepiece
  • Small and lightweight, adding virtually no bulk to the camera

👎 Cons

  • Only available in a fixed +1 diopter strength, which will not suit all vision prescriptions
  • Cannot be used at the same time as an eyecup, reducing comfort for some shooters
  • Compatibility is limited to specific Pentax camera bodies that accept M-series diopter adapters
  • Does not help with astigmatism or other vision conditions beyond simple farsightedness

Frequently Asked Questions

The +1 value indicates one diopter of farsighted correction. This adapter shifts the viewfinder's focus point to help photographers with mild farsightedness see the viewfinder image more clearly without wearing glasses.
It is designed for Pentax K-mount cameras that accept M-series diopter adapters. It attaches to the viewfinder eyepiece on compatible Pentax SLR and DSLR bodies.
No, the diopter adjustment lens adapter cannot be used simultaneously with an eyecup. You will need to remove the eyecup before attaching this adapter.
It is intended as an alternative to wearing glasses while looking through the viewfinder. If the +1 correction matches your prescription, you may be able to shoot comfortably without glasses, getting a full, unobstructed view of the viewfinder.