Andoer 50 mm F1.7
5.0Editor score
50mm F1.7 aperture
Manual focus design
Full frame compatible
In this guide
Finding the right glass for your Pentax body can transform your photography experience. K Mount lenses offer a legacy of optical excellence and modern versatility for shooters today.
We compared ten real options based on ratings, features, and user feedback to help you decide. This list covers primes, zooms, and accessories across various price points and needs.
Each pick highlights key strengths and trade-offs so you can choose wisely. Prices and availability change often so verify details on the product pages before you buy.
Top 3 Picks for Best K Mount Lenses for Pentax Camera
Pentax SMC PENTAL-Da 35mm
4.6Editor score
35mm equivalent focal
Aspherical lens element
Super Protect Coating
Pentax 21977 DA 18-135mm
4.5Editor score
75X zoom range
Weather resistant build
DC motor focus
Top 10 Best K Mount Lenses for Pentax Camera in 2026 Compared
This side-by-side comparison shows key specs for each lens so you can evaluate size, focal length, and features at a glance before making a choice.
ProductsSpecificationsEditor scorePrice
Best Budget
Andoer 50mm F1.7
50mm F1.7 prime
Manual focus only
Full frame support
Lightweight build
5.0Editor score
Editor's Choice
Pentax SMC PENTAL-Da 35mm
35mm standard view
Hybrid aspherical lens
Super Protect Coating
Compact 124g weight
4.6Editor score
Best Premium
Tamron AF 70-300mm f/4.0-5.6
70-300mm zoom range
37.4 inch focus
Di macro support
LD lens elements
4.1Editor score
Pentax SMC 50mm F1.7 Renewed
50mm film lens
Manual focus ring
Renewed condition
Classic optics
3.0Editor score
Sigma 28-80mm F3.5-5.6
28-80mm zoom
Aspherical elements
HF motor
Macro function
Pentax Asahi SMC M 50mm
50mm F2.8 aperture
Manual focus lens
PK Bajonett mount
Good used condition
5.0Editor score
Pentax SMC 50mm F/2.0 Renewed
50mm F2.0 prime
Manual focus ring
Metal mount
Renewed quality
SMC Pentax-M 50mm F1.7
50mm F1.7 prime
Manual focus design
Classic SMC coating
Durable build
4.2Editor score
Pentax 21977 DA 18-135mm
18-135mm zoom
Weather resistant WR
DC motor AF
ED AL elements
4.5Editor score
K&F CONCEPT Rear Lens Cap Kit
Lens and body caps
Hot shoe cover
Pentax K compatible
Microfiber cloth
4.7Editor score
1. Andoer 50 mm F1.7 – Best Budget Prime
Andoer 50 mm F1.7
50mm focal length
F1.7 max aperture
Manual focus type
PK Mount system
This Andoer lens offers a budget friendly way to shoot with a 50mm prime on Pentax K Mount bodies. It rates highly for its large F1.7 aperture and manual focus design.
Pros
- Affordable price point
- Large aperture for light
- Full frame compatible
- Simple manual focus
- Good for beginners
Cons
- No autofocus motor
- Basic build materials
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The large aperture allows more light in for low light scenes and shallow depth of field. The prime focal length is classic for portraits and street shots on full frame or crop sensors.
You must focus manually so this lens is best for slow paced creative work. The build is simple which keeps the cost down but may feel less rugged than branded optics.
Buy this if you want an affordable entry into prime photography without spending much. It pairs well with Pentax K1 or K1 Mark II cameras for solid results.
Great Value for Manual Focus
The low cost makes it easy to experiment with prime focal lengths without a big investment.
Bright Aperture for Low Light
F1.7 lets you shoot in dimmer conditions while keeping ISO lower for cleaner images.
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2. Pentax SMC PENTAL-Da 35mm – Editor's Choice
Pentax SMC PENTAL-Da 35mm
35mm equivalent view
F2.4 max aperture
Aspherical lens
Super Protect Coating
The Pentax 35mm lens stands out for its balance of size sharpness and ease of use. It earns top marks as a reliable standard lens for daily shooting on K Series cameras.
Pros
- Compact lightweight design
- Sharp image quality
- Dust resistant coating
- Ideal first lens
- Bright F2.4 view
Cons
- Fixed focal length only
- No weather sealing noted
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Hybrid aspherical elements correct aberrations for sharp contrast from center to edge. The F2.4 aperture gives good brightness for framing and low light while the SP coating repels dust and water.
It is very light at 124g so you can carry it all day without fatigue. The trade off is a fixed focal length which limits zooming but encourages creative composition.
Choose this if you want a versatile everyday lens for snapshots landscapes and portraits. It works with in camera shake reduction for stable shots without needing a tripod.
Optical Sharpness and Contrast
Hybrid aspherical lenses ensure clear details and high contrast across the image frame.
Durable Coating Protection
Super Protect Coating keeps the front surface clean from water grease and dust.
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3. Pentax 21977 DA 18-135mm – Best Premium Zoom
Pentax 21977 DA 18-135mm
18-135mm zoom range
Weather resistant WR
DC motor autofocus
ED AL elements
This Pentax zoom covers a broad range from wide angle to telephoto in one compact package. It rates well for its weather resistance and quick autofocus for versatile shooting.
Pros
- Wide zoom range
- Weather resistant build
- Quiet autofocus motor
- Compact for travel
- Dust repelling coating
Cons
- Variable aperture range
- Higher price point
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The 75X zoom handles landscapes and distant subjects. ED and AL elements reduce color fringing and improve clarity. The DC motor focuses quietly while the SP coating protects against moisture.
The variable aperture means light drops at longer focal lengths but the reach is valuable. Weather sealing allows use in damp conditions where other lenses might struggle.
Buy this if you want one lens for varied scenes and weather conditions. It suits travel and event photography where changing lenses is not always practical.
Versatile Zoom Range
18-135mm covers wide to telephoto so you can adapt to many subjects quickly.
Weather Resistance for All Conditions
WR sealing lets you shoot in rain or humidity without damaging the optics.
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4. Pentax SMC 50mm F1.7 – Classic Prime
Pentax SMC 50mm F1.7 Renewed
50mm focal length
F1.7 max aperture
Manual focus lens
Renewed condition
This renewed Pentax 50mm brings classic optics to modern K Mount bodies at a lower cost. It offers manual focus and a bright F1.7 aperture for creative control.
Pros
- Classic optical design
- Affordable renewed price
- Manual focus control
- Compatible with K Mount
Cons
- Used condition variable
- No autofocus support
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The prime lens is great for portraits and low light shooting. Renewed units vary so check the condition carefully before buying. It lacks autofocus so expect to focus by hand.
You save money compared to new lenses but take on some risk with used gear. The F1.7 aperture still delivers shallow depth of field for standout portraits.
Choose this if you want a budget prime with trusted optics. It is best for patients who enjoy manual focus and want to save on cost.
Classic Lens Optics
The SMC coating and 50mm design provide reliable image quality and color.
Renewed Savings
Buying renewed helps you get a known lens design at a reduced price point.
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5. Sigma 28-80mm – Versatile Zoom Option
Sigma 28-80mm F3.5-5.6
28-80mm zoom range
Aspherical lens element
HF motor system
Macro capability
Sigma's 28-80mm offers a wide zoom span with macro ability for close work. It uses an HF motor for quick focus and aspherical elements for sharp images.
Pros
- Broad zoom range
- Macro function built-in
- HF autofocus motor
- Affordable price
Cons
- Older lens model
- Variable aperture
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The range covers everyday needs from group shots to tighter angles. The macro feature adds utility for small subjects. Older designs may not match modern coatings but still deliver.
Variable aperture means light drops as you zoom which affects low light performance. The build is solid for the price but lacks weather resistance.
Buy this if you need a general zoom on a budget. It suits users who want one lens for casual and macro work without high cost.
Macro Feature for Close-ups
Built-in macro mode lets you capture fine details on small objects easily.
Smooth Autofocus with HF
The HF motor provides quicker focusing compared to older screw drive lenses.
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6. Pentax Asahi SMC M 50mm – Vintage Prime
Pentax Asahi SMC M 50mm
50mm focal length
F2.8 max aperture
PK Bajonett mount
Used good condition
This Pentax Asahi lens is a classic PK mount prime with a good used condition rating. It brings vintage optics to modern shooters who appreciate manual focus and timeless design.
Pros
- Vintage lens appeal
- Solid manual focus
- PK mount legacy
- Used value option
Cons
- No auto aperture
- Manual focus only
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The 50mm focal length is versatile for portraits and street work. SMC coating helps reduce flare and improve contrast. It requires manual focus and aperture control.
Vintage lenses can show wear so inspect images carefully. The build is durable and the optics remain sharp for a great look at a fair price.
Choose this if you enjoy manual control and classic gear. It fits well with K Mount bodies for a retro experience with reliable performance.
Vintage SMC Optics
The SMC coating helps manage light for cleaner images with less flare.
Durable Manual Focus Design
The lens features a sturdy build designed for reliable manual shooting.
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7. Pentax SMC 50mm F/2.0 – Portrait Prime
Pentax SMC 50mm F/2.0 Renewed
50mm focal length
F2.0 max aperture
Manual focus ring
Metal mount build
This Pentax 50mm F2.0 renewed lens offers bright optics for portraits and low light. It features a manual focus ring and metal mount for solid handling on K Mount bodies.
Pros
- Bright F2.0 aperture
- Manual focus precision
- Metal mount durability
- Renewed affordability
Cons
- Used condition variable
- No autofocus
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F2.0 allows shallow depth of field and good light gathering. The metal mount helps ensure durability during use. Renewed units vary so check details carefully.
Manual focus requires patience but offers creative control. The lack of autofocus limits quick action but suits posed and creative work.
Buy this if you want a strong prime at a lower cost. It is best for portrait and street shooters who prefer manual focus.
Bright Aperture for Portraits
F2.0 helps isolate subjects with smooth bokeh and better low light results.
Metal Mount for Longevity
The metal mount ensures the lens connects securely to the camera body.
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8. SMC Pentax-M 50mm – Trusted Classic
SMC Pentax-M 50mm F1.7
50mm focal length
F1.7 max aperture
Manual focus lens
SMC coating
The SMC Pentax-M 50mm is a known prime with reliable manual focus and bright F1.7 aperture. It earns good ratings for performance and build on K Mount cameras.
Pros
- Trusted Pentax optics
- Bright F1.7 aperture
- Manual focus design
- Durable construction
Cons
- No autofocus
- Used condition unknown
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SMC coating reduces flare and improves contrast for cleaner shots. The manual focus ring allows precise control. It is a used item so inspect for wear.
This lens suits those who value tradition and optical quality. The lack of autofocus is a trade off but the sharpness is often worth it.
Choose this if you want a proven manual lens at a reasonable cost. It works well for portraits and general photography on Pentax bodies.
SMC Coating Quality
The SMC coating helps deliver clear images with minimal flare and better contrast.
Manual Focus Precision
Focus manually for exact control over your subject and depth of field.
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9. K&F CONCEPT Rear Lens Cap Kit – Essential Accessory
K&F CONCEPT Rear Lens Cap Kit
Lens and body caps
Hot shoe protector
Pentax K Mount
Microfiber cloth
This kit provides covers for your Pentax camera and lenses plus a hot shoe cap. It rates highly for protecting gear from dust moisture and scratches during storage.
Pros
- Complete protection kit
- Fits K Mount bodies
- Dust moisture protection
- Includes cloth
Cons
- Accessory not lens
- Basic plastic build
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The rear lens cap guards the mount while the body cover shields the sensor. The hot shoe cover keeps the connector clean. Includes a microfiber cloth for quick cleaning.
It is not a lens but helps keep your lenses and camera safe. Plastic build is light and durable enough for travel and daily use.
Buy this to protect your K Mount gear when not in use. It is a smart add on for any Pentax owner to maintain clean equipment.
Protects Lens Mount and Sensor
Rear caps keep dust from entering the camera body and lens mount.
Hot Shoe Protection
Keeps the hot shoe free from debris and moisture damage.
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10. Tamron AF 70-300mm – Telephoto Zoom
Tamron AF 70-300mm f/4.0-5.6
70-300mm zoom range
Macro focus support
LD lens elements
37.4 inch focus
This Tamron lens gives solid reach up to 300mm for distant subjects. It includes macro support and LD elements for better sharpness and color.
Pros
- Strong telephoto reach
- Macro capability
- Affordable zoom option
- LD elements
Cons
- Variable aperture
- Heavier than primes
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The zoom range covers sports wildlife and portraits. The 37.4 inch minimum focus allows close work. Variable aperture affects low light but reach is useful.
The lens is heavier than primes but offers flexibility. Build is standard and the price fits budget telephoto needs.
Choose this if you need long reach without a big spend. It suits users who want zoom versatility and occasional macro shots.
Telephoto Reach
300mm lets you capture distant subjects clearly for wildlife or events.
Macro Capability
Close focus distance supports macro shots for added versatility.
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Buying Guide – How to Choose the Best K Mount Lenses for Pentax Camera
Selecting the right lens depends on your budget focal needs and desired features. This guide covers key factors to consider when shopping for K Mount glass.
Focal Length
Choose a focal length that matches your subjects. Primes like 50mm suit portraits while zooms cover a wider range.
Decide between prime sharpness and zoom flexibility based on how you shoot.
Aperture Size
Larger apertures like F1.7 allow more light and shallower depth of field. Smaller ones are slower but often lighter.
Pick F1.7 or wider for low light and bokeh effects.
Autofocus vs Manual Focus
Autofocus helps with quick action while manual focus gives precise control. Many primes are manual only.
Use autofocus for speed and manual for creative focus.
Build Quality
Metal mounts and weather resistance add durability. Plastic builds save weight and cost.
Consider weather sealing for outdoor use.
Coatings and Optics
SMC or SP coatings reduce flare and protect against dust. Aspherical elements improve sharpness.
Look for coated optics for cleaner images.
Condition and Price
Renewed or used options save money but vary in condition. New lenses offer warranties.
Balance cost with expected longevity.
Lens Type
Zooms offer flexibility while primes offer speed and sharpness. Macro lenses add close focus.
Choose a type that matches your work.
Mount Compatibility
Ensure the lens fits your Pentax K Mount body. Some are full frame while others are crop.
Check sensor size compatibility for best results.
How to Use and Care for Your K Mount Lenses for Pentax Camera
Attach lenses carefully by aligning the markers and twisting until they lock. Keep covers on when not in use to prevent dust.
Clean optics gently with a soft cloth and cleaning solution. Avoid touching glass with fingers.
Store lenses in a dry place away from direct sun. Use a protective bag to avoid bumps.
Frequently Asked Questions
What is K Mount?
K Mount is the bayonet mount used by Pentax SLR and DSLR cameras. Most modern Pentax lenses fit this system and work with in camera stabilization.
Are K Mount lenses weather resistant?
Some models feature WR sealing to handle moisture and dust. Check the product specs before buying if you need weather resistance.
Do primes have autofocus?
Many K Mount primes are manual focus only. Some newer models include autofocus but most classic primes focus by hand.
Can I use K Mount on full frame?
Yes K Mount includes full frame lenses. Check the lens description to confirm full frame compatibility for best coverage.
What is SMC coating?
Super Multi Coating reduces flare and ghosting for clearer images. It helps improve contrast and color accuracy on Pentax lenses.
How to clean lens glass?
Use a microfiber cloth and lens cleaning fluid. Blow air first to remove dust and wipe gently in circles.
Final Thoughts on Choosing the Best K Mount Lenses for Pentax Camera
The Andoer 50mm, Pentax 35mm, and Pentax 18-135mm offer strong value and performance across budget and premium needs.
Prioritize focal length and aperture based on your main subjects and shooting style.
Check current prices and stock on Amazon before buying since they change often.