Production
1960 – 1989
Country
Japan
Optical
4-7 elements in 4-6 groups
Updated
Jul 15, 2026
Vivitar 28mm f2.5
M42 and K-mount · 28mm · f/2.5
Compiled from 6 real reviews · AI-assisted · accuracy-checked · Updated 15 Jul 2026
Overview
The Vivitar 28mm f/2.5 belongs to the era when Vivitar operated as a badge-engineering house rather than a manufacturer, commissioning lenses from Japanese third parties and selling them under its own name. According to the reviews, this wide-angle was most often built by Kiron, and collectors identify the Kiron-made copies by their serial numbers — 'Kiron' being the only real piece of jargon attached to the lens, used to denote a specific (and generally respected) maker rather than a nickname. The sources are explicit that there is no established nickname for this lens; do not expect one. Its following is modest and practical rather than cultish: people gravitate to it as a solidly-built, character-driven budget wide-angle with a genuinely excellent metal barrel and focus action, accepting its optical quirks as the price of a cheap, tactile shooter. Reviewers consistently frame it as 'nice, pleasant, good value but not stellar,' and several note that the separate f/2.8 Vivitar 28mm is rated more highly than this f/2.5 version.
Verdict: The Vivitar 28mm f/2.5 is for the manual-focus enthusiast who wants a beautifully built, tactile budget wide-angle and is willing to work around its optics rather than fight them. In good, controlled light it delivers reasonable sharpness, low distortion, and pleasant colour; point it toward the sun and its large front element flares badly, vignetting is heavy wide open, and its bokeh turns inconsistent with ringed highlights. Buy it for the character and the superb focus feel, not for clinical performance — and if uncompromised optics matter more, the separate f/2.8 version is the more highly regarded choice.
Optical Character
Bokeh
Inconsistent—sometimes very nice, sometimes mediocre—with circular ringed highlights attributed to flare from the large front element.
Color
Decent colour rated slightly behind a Pentax M 28mm f/2.8.
Sharpness wide open
Reasonable to good even wide open with some lack of fine detail, improving when stopped down; copy-to-copy variation noted.
Flare resistance
Poor—strong fear of backlight and prone to flare due to the unusually large front element.
Contrast
Decent but readily degraded by flare in backlit conditions.
Vignetting
Very severe at f/2.5 wide open, easing as the lens is stopped down.
Community Insights
What people love
- Excellent build quality — a solid metal barrel that feels well assembled, praised across multiple reviews.
- A smooth, precise manual focus ring with a long ~270° (over half a turn) throw that makes careful manual focusing easy.
- Good value as a pleasant, character-driven budget wide-angle that punches acceptably for its low price.
- Reasonable-to-good sharpness even wide open, tightening up nicely when stopped down (one f/8 sample looked notably sharp).
- Well-controlled distortion for a 28mm wide-angle.
- The Kiron-made pedigree, which collectors seek out and can identify by serial number.
What people dislike
- Strong susceptibility to flare and a 'fear of backlight' from the large front element, which washes out detail.
- Severe vignetting wide open at f/2.5.
- Inconsistent bokeh — sometimes lovely, sometimes mediocre — with intrusive circular ringed highlights.
- Colour and contrast that sit slightly behind comparable Pentax primes.
- Some lack of fine detail wide open.
- Copy-to-copy variation, and a general sense that the separate f/2.8 Vivitar version is the better performer.
Pro Tips
- Treat backlight as the enemy: shade the large front element with your hand or a hood, or reposition so the light source is out of frame — this is the single biggest thing you can do to preserve contrast and detail.
- Stop down to around f/5.6–f/8 to sharpen the image, tame the severe wide-open vignetting, and clean up the corners; wide-open f/2.5 is usable but softer with heavy corner darkening.
- Use the long ~270° focus throw to your advantage for slow, deliberate manual focusing.
- If you want the cleanest rendering, keep bright point-light sources out of the defocused areas, since flare turns them into ringed discs; alternatively, embrace those ringed highlights deliberately when you want the lens's characterful look.
- Meter for and lean into the wide-open vignetting only when it suits the composition; otherwise close down a stop or two to even out the frame.
Compatible Adapters
Real adapters from our shop that fit this lens mount.
Standard · ฿325 · In stock
Standard · ฿325 · In stock
Standard · ฿325 · In stock
Standard · ฿325 · In stock
Standard · ฿540 · In stock
Standard · ฿540 · In stock
Standard · ฿540 · In stock
Standard · ฿540 · In stock
Standard · ฿540 · In stock
Standard · ฿1,250 · In stock
Standard · ฿890 · Out of stock
Standard · ฿890 · Out of stock
Sample Photos
Sources (6)
Review Vivitar 28mm 1:2.5 Auto Wide-Angle
Vivitar 28mm f/2.5 from Kiron - Hin's Photo Corner
Vivitar 28mm f2.5 - MFlenses forum
Web research
The Vivitar 28mm f/2.5 is for the manual-focus enthusiast who wants a beautifully built, tactile budget wide-angle and is willing to work around its optics rather than fight them. In good, controlled light it delivers reasonable sharpness, low distortion, and pleasant colour; point it toward the sun and its large front element flares badly, vignetting is heavy wide open, and its bokeh turns inconsistent with ringed highlights. Buy it for the character and the superb focus feel, not for clinical performance — and if uncompromised optics matter more, the separate f/2.8 version is the more highly regarded choice.
https://radojuva.com/en/2013/06/obzor-vivitar-28-mm-2-5/https://www.techtheman.com/2008/03/vivitar-28mm-f25-from-kiron.htmlhttps://forum.mflenses.com/vivitar-28mm-f2-5-t27585.html
MFLenses forum
The Vivitar 28mm f2.5 is a solid vintage lens option with reliable performance. Community members recommend it as a capable performer for photographers seeking good optical quality combined with vintage character and affordability.
DPReview forum
The Vivitar 28mm f2.5 is a solid vintage lens option with reliable performance. Community members recommend it as a capable performer for photographers seeking good optical quality combined with vintage character and affordability.