Sears Sears 28mm f2.8 Heritage

เรื่องราวของเลนส์

The Sears 28mm f2.8 is a rebadged third-party wide-angle lens sold under the Sears house brand during the 1970s, a common practice where retailers marketed lenses made by established Japanese optical manufacturers under their own name. According to one reviewer, the lens (labeled 'Auto-Sears-MC') was likely made by Cosina, and their example was purchased with a camera and other lenses in the mid-1970s. It was made in Japan and available in M42 screwmount as well as PK mount variants (model numbers 199.730610 in M42 and 199.730310 in PK). Reviewers describe it as solidly built, 'built like a tank,' with smooth focusing. It has no established nicknames or cult following; it is regarded as a competent, affordable budget lens rather than a legendary optic. People appreciate it primarily for its value and mechanical quality rather than any standout optical signature.

สรุป: The Sears 28mm f2.8 is a solidly built, affordable vintage wide-angle for photographers who want a durable, smooth-focusing lens without a premium price. It won't win awards for optical character and shows softness and CA wide open, but stopped down to f5.6-f8 it delivers sharp, accurate images. It's best suited for budget-conscious adapters and collectors who value build quality and value over standout rendering.

คาแรกเตอร์ของภาพ

โบเก้

ได้รับการให้คะแนนในระดับปานกลาง (ประมาณ 6–7) โดยไม่ได้ให้รายละเอียดเชิงพรรณนาเพิ่มเติม

โทนสี

ถ่ายทอดสีได้อย่างแม่นยำ

ความคม (เปิดสุด)

ให้ภาพค่อนข้างนุ่มเมื่อใช้รูรับแสงกว้างสุดที่ f/2.8 แต่จะคมเมื่อหรี่รูรับแสงลง โดยเฉพาะที่ f/5.6–f/8 และยังคงคมดีจนถึง f/11

แฟลร์

การควบคุมแฟลร์ทำได้ดี

คอนทราสต์

การควบคุมคอนทราสต์ทำได้ดี

รีวิวจากผู้ใช้

ข้อดี

Solid, tank-like build quality that feels durable and well-made
Smooth focusing action that feels great in use
Excellent value for the low price point (average around $37.50)
Accurate color rendering with well-controlled contrast and flare
Good sharpness when stopped down to f5.6-f8

ข้อเสีย

Softness wide open at f2.8
Very noticeable chromatic aberration, particularly evident on the Pentax K-3 III
Optics described as 'not great' or merely 'OK' by some reviewers
Aperture blades can become stuck due to oil (though this is cleanable)

เทคนิคการใช้

Stop down to f5.6-f8 for the sharpest results across the frame
Avoid relying on f2.8 for critical sharpness as it is soft wide open
If the aperture is sticky, cleaning the oil from the blades is reportedly easy and restores snappy operation
Be aware of chromatic aberration when shooting high-contrast edges on digital bodies

แหล่งอ้างอิง (1)

Web-grounded synthesissecondary

The Sears 28mm f2.8 is a rebadged third-party wide-angle lens sold under the Sears house brand during the 1970s, a common practice where retailers marketed lenses made by established Japanese optical manufacturers under their own name. According to one reviewer, the lens (labeled 'Auto-Sears-MC') was likely made by Cosina, and their example was purchased with a camera and other lenses in the mid-1970s. It was made in Japan and available in M42 screwmount as well as PK mount variants (model numbers 199.730610 in M42 and 199.730310 in PK). Reviewers describe it as solidly built, 'built like a tank,' with smooth focusing. It has no established nicknames or cult following; it is regarded as a competent, affordable budget lens rather than a legendary optic. People appreciate it primarily for its value and mechanical quality rather than any standout optical signature.

https://www.pentaxforums.com/userreviews/sears-28mm-f28.html