Featuring a wide 60° field of view and generous 18mm eye relief for comfortable glassing, the Pentax XF smc 12mm 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: 52x power, 63-foot field of view at 1000 yards (21m field of view at 1000m)
• PF-80EDA: 43x power, 72-foot field of view at 1000 yards (24m field of view at 1000m)
• PF-80ED: 42x power, 78-foot field of view at 1000 yards (26m field of view at 1000m)
• PF-65EDAII: 32.5x power, 96-foot field of view at 1000 yards (32m field of view at 1000m)
• PF-65EDII: 32.5x power, 96-foot field of view at 1000 yards (32m field of view at 1000m)

Related Questions and Answers

Q: 1. I am confused. If a full frame sensor is smaller than 645, shouldn't the effective focal length increase instead of decrease?

A: Typically, angle-of-view and focal length are described relative to full-frame 35mm as it is more widespread in use. Crop factors would be then be 1x for 35mm, 1.5x for APS-C, and 0.6~0.8 (rough estimate) for medium format sensors. Since this lens is still technically (from physical distance measured stand-point) 400mm from the sensor, it's a 400mm lens. However, its angle-of-view would be equivalent to a 315mm on a full-frame.

Q: 2. 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.

Q: 3. If used on another camera via an adapter, will it still have full manual control?

A: It depends on the adapter. Ask the adapter Co.

Q: 4. can it be used with the 645Z body?

A: Yes, this lens will work on the 645z body

Q: 5. 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: 6. Can you please tell me if the fine focus adjustment apply one setting works for this lens, without having to use the 'apply all' setting? it would be not so convenient to have to remember to zero the setting every time I change the lens. Thank you.

A: You will want to contact the manufacturer directly for assistance with this inquiry.

Q: 7. 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: 8. Hi there, I am new to Medium Format Cameras, does this lens have Vibration Control?

A: Shake reduction built into the lens is already old and redundant technology. The newest technology is Pentax's shake reduction done on the sensor instead of the lens. Already rolled out on models like the K1 and KP. Let's hope they include it into the next version of 645.

Q: 9. please can someone tell me how to set this lens sot auto focus?

A: You have to pull in the furthest ring for manual or automatic focusing

Q: 10. Can I manual focus this lens? Or is it auto-focus only? Thanks.

A: It works with Pentax 645 film bodies? 645N and 645NII?