Featuring a wide 60° field of view and generous 18mm eye relief for comfortable glassing, the Pentax XF smc 8.5mm Eyepiece is designed for use with their 100, 80, and 65mm spotting scopes or any telescope or spotting scope that accepts standard 1.25" eyepieces. Extra-low dispersion lanthanum glass in the 6-element/4-group lens design provide a balanced image with minimal aberrations, while the proprietary smc anti-reflection multi-layer lens coatings prevent reflection for optimal light transmission. The eyepiece is constructed to be water resistant, easily withstanding light rain or dew. For digiscoping, there is a 30.5mm mounting thread under the removable twist-up click-stop eyecup for attaching your rings and adapters.

Generous 60° Apparent Field of View    Fits Any Scope Using 1.25" Eyepieces    Extra-Low Dispersion Lanthanum Glass    Proprietary smc Multi-Layer Lens Coating    Long & Comfortable 18mm Eye Relief    6-Element/4-Group Lens Design    Twist-Up Click-Stop Eyecup

• PF-100ED: 74x power, 42-foot field of view at 1000 yards (14m field of view at 1000m)
• PF-80EDA: 61x power, 49.5-foot field of view at 1000 yards (16.5m field of view at 1000m)
• PF-80ED: 59x power, 51-foot field of view at 1000 yards (17m field of view at 1000m)
• PF-65EDAII: 46x power, 66-foot field of view at 1000 yards (22m field of view at 1000m)
• PF-65EDII: 46x power, 66-foot field of view at 1000 yards (22m field of view at 1000m)

Related Questions and Answers

Q: 1. is this lens weather proof?

A: This lens is not weather proof.

Q: 2. What is the minimum focusing distance? What is the maximum magnification?

A: The Pentax smc FA 645 300mm f/4 ED (IF) Lens has a minimum focusing distance of 7.22' / 2.2 m. This lens has a maximum magnification of 0.16x.

Q: 3. What is the right replacement lens shade for this?

A: I contacted Pentax with your inquiry, and they stated the correct lens hood for the Pentax smc FA 645 80-160mm f/4.5 Lens is the Pentax PH-RBF77 Lens Hood, MFR Part # 38729. Unfortunately this lens hood is no longer manufactured by Pentax and currently we do not have the lens hood in new or used options. I did check our new department and our Used Photography Department, but unfortunately, we do not have the lens hood new or used. As such, you may have to check either online in used camera stores or on a auction site like eBay to see if anyone is selling the lens. I do apologize for any inconvenience this may cause you.

Q: 4. Does this lens offer total manual control?

A: YES

Q: 5. Has anyone compared this to the older manual focus 120mm f/4 A lens? I have it and it gives focus confirmation beep, I can't imagine it being much shaper but I don't use it for portraits because I don't want the delay of finding focus using live view and zooming in...

A: The Pentax smc FA 645 120mm f/4 Macro Lens is improved from the older version, because it has better muticoating on the lens, giving the photographer fewer hazy images with improved contrast and sharpness.

Q: 6. I want to know the diameter of this lens? For example Canon 200 L lens has a diameter of 72mm. How much is for this lens?

A: The diameter of this lens is 74.5mm.

Q: 7. My 200mm 645z lens operates flawlessly but I notice that in manual focus, the focus ring is hardly damped at all. Quite, almost too easy to turn. Do any owners notice the same?

A: We have not had any issues we are aware of from customers with manual focus on that lens. If you do feel you might have an issue you need to contact direct our customer service department.

Q: 8. Will this lens work on the Pentax K-3 III?

A: Not directly, Pentax smc FA 645 400mm f/5.6 ED IF Lens has a Pentax 645 medium format native mount.Pentax K-3 Mark III DSLR Camera has a K-mount. You can use a lens adapter to connect Pentax 645 lenses to Pentax K-mount cameras. All the current adapters are strictly under full manual operations.

Q: 9. I read that the 35mm equivalent is like 35.6mm focus lens. Is this for a full 645 format, or the reduced 33x44 format of the 645D?

A: The Pentax smc FA 45mm f/2.8 lens has a 35mm focal equivalent length of 35.5mm. This lens is for full 645 format.

Q: 10. Can the tripod mount ring be removed?

A: No, the tripod mount ring on the Pentax smc FA 645 300mm f/4 ED (IF) Lens cannot be removed.