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For an APS-C camera, the Sigma 50-120mm F2.8 DC OS Contemporary is the clearest choice when you want a compact, constant-F2.8 telephoto zoom. Sigma specifies approximately 75–180mm in 35mm-equivalent terms, a 99mm lens length and a 390g weight. That combination gives you useful portrait and event reach without the size normally associated with a 70-200mm lens.
The Sigma APO 50-150mm F2.8 EX DC OS HSM is a discontinued APS-C lens. It can still make sense as a used-market purchase, but only after you verify the mount, physical condition and sensor-format limitations. A 70-200mm lens may provide more reach, but that label covers many different designs. The exact generation, mount and camera-body compatibility determine whether it is the right fit.
Quick answer: choose by camera format first
Your camera’s sensor size and lens mount eliminate more options than focal length does. The 50-120mm and 50-150mm discussed here are DC lenses designed for APS-C cameras. Sigma gives the 50-120mm an approximate full-frame-equivalent range of 75–180mm, while the older 50-150mm is also intended for APS-C and is specifically warned against use on sensors larger than APS-C because of vignetting.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →A 70-200mm is not one universal product. Some versions are designed for full-frame cameras, others may be offered for different mounts, and compatibility can vary by generation. Treat “70-200mm” as a focal-range description, not a complete specification.
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| Option | Best starting point | Important qualification |
|---|---|---|
| Sigma 50-120mm F2.8 DC OS Contemporary | APS-C photographers wanting a compact, constant-F2.8 telephoto zoom | Designed for APS-C; Sigma specifies 75–180mm equivalent, 99mm length and 390g |
| Sigma APO 50-150mm F2.8 EX DC OS HSM | Buyers considering a used APS-C lens and needing the longer 150mm end | Discontinued; larger-than-APS-C sensors can vignette; mount and condition must be checked |
| 70-200mm lens | Photographers who need a particular model’s reach, format or compatibility | Exact model, generation and mount are required before you can assess fit |
What the Sigma 50-120mm F2.8 provides
APS-C coverage equivalent to about 75–180mm
The 50-120mm focal lengths are the physical measurements of the lens. On an APS-C body, Sigma lists their viewing angle as approximately 75–180mm in 35mm-equivalent terms. The equivalent figures are a way to compare framing with a 35mm or full-frame camera; they do not turn the lens into a full-frame lens.
At the short end, 50mm on APS-C is suitable for tighter portraits, candid people photography and details at outdoor events. At 120mm, the narrower view helps isolate a subject from farther away. The practical framing depends on the camera’s particular APS-C crop factor, so Sigma’s approximate range is the appropriate published reference rather than a promise of identical framing on every sensor.
Constant F2.8 aperture
The lens keeps an F2.8 maximum aperture throughout its zoom range. You can change focal length without the maximum-aperture number changing, which simplifies exposure settings and keeps the lens’s light-gathering capability consistent from 50mm through 120mm. A constant aperture is also useful when recording a sequence in which the framing changes, because the lens does not require a compensating aperture change solely because you zoomed.
F2.8 does not guarantee a particular background blur, autofocus speed or low-light result. Those outcomes also depend on subject distance, camera settings, the camera body and the specific scene. The available specification establishes the constant aperture, not an independent performance ranking.
Compact dimensions and weight
Sigma specifies a 99mm lens length and 390g weight. Those are manufacturer specifications and are the strongest objective portability distinction supplied for this comparison. A lens with those dimensions is easier to pack and carry than many larger telephoto zooms, especially when your kit already includes standard or wide-angle lenses.
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Weight matters beyond comfort. A lighter lens places less load on a small APS-C body, is easier to hold during a long event and leaves more room in a camera bag for another lens or spare battery. It does not, by itself, establish build quality, optical sharpness or stabilization effectiveness.
How the older 50-150mm differs
It is a discontinued APS-C lens
Sigma lists the APO 50-150mm F2.8 EX DC OS HSM among its discontinued products. Sigma’s legacy information also marks SA, Canon EF and Nikon F versions as discontinued. New retail availability therefore cannot be assumed, and a listing described as “new” may represent remaining inventory rather than a current product line.
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Discontinued status changes the buying process. You are evaluating a particular used or residual-stock copy, not simply selecting a currently supported model. The seller’s photos, return policy, serial information and description matter as much as the model name.
The longer 150mm end is not a free upgrade
Compared with the 50-120mm, the 50-150mm reaches 30mm farther at the telephoto end while retaining an F2.8 designation. That extra reach can help when you cannot move closer to a subject. It also changes the size, age and availability questions you must resolve. The supplied specifications do not provide a common measurement for length, weight, sharpness or autofocus, so it would be inaccurate to declare one lens optically superior from focal range alone.
Check the sensor-format warning
Both lenses carry the DC designation associated with APS-C use, but Sigma explicitly warns that the 50-150mm will vignette on sensors larger than APS-C. On a full-frame body, the image circle may not cover the entire sensor, producing dark corners. Cropping can sometimes hide those corners, but that reduces the usable image area and is not the same as full-frame compatibility.
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If your camera can switch to an APS-C crop mode, check the body’s manual and your intended workflow before relying on it. The safest interpretation of Sigma’s warning is to use this lens on an APS-C camera unless the seller or manufacturer documents a specific alternative.
What “70-200mm” does and does not tell you
Model and mount are essential information
A 70-200mm comparison is meaningful only after the complete product name is known. The same focal range appears in multiple generations, mounts, sensor formats and feature sets. Aperture, dimensions, weight, stabilization, focusing system and compatibility can all differ.
Sigma’s cited DG OS HSM page documents compatibility for one specific model. It also states that certain Nikon F lenses can be used with specified Z bodies when the Nikon FTZ mount adapter is attached. That statement belongs to the documented lens and bodies; it must not be generalized to every 70-200mm lens, every Nikon F version or every camera adapter.
Why the range may still be attractive
A 70-200mm lens starts at a longer focal length than either APS-C option. On a full-frame body, that range is commonly chosen when the photographer wants strong subject isolation and reach for portraits, sports or events. On an APS-C body, the framing becomes narrower still, but the exact equivalent depends on the camera’s crop factor and the lens’s format compatibility.
The trade-off is that many 70-200mm designs are physically larger than a compact APS-C zoom. This article’s supplied evidence does not include normalized dimensions, weights or test results for a 70-200mm model, so compare those values for the exact lens you are considering rather than assuming that all lenses with the same name are alike.
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Specification comparison
| Decision axis | 50-120mm F2.8 DC OS Contemporary | APO 50-150mm F2.8 EX DC OS HSM | 70-200mm option |
|---|---|---|---|
| Intended sensor format | APS-C | APS-C; Sigma warns of vignetting on larger sensors | Depends on the exact model |
| Published focal-range equivalent | Approximately 75–180mm in 35mm-equivalent terms | Not stated in the supplied specifications | Not stated without a specific camera and model |
| Maximum aperture | Constant F2.8 | F2.8 | Depends on the exact model |
| Published length | 99mm | Not stated in the supplied specifications | Not stated without a specific model |
| Published weight | 390g | Not stated in the supplied specifications | Not stated without a specific model |
| Availability status | Current product page; verify local stock and mount | Discontinued; usually a used-market or remaining-stock purchase | Varies by manufacturer, generation and mount |
| Evidence of common sharpness or autofocus testing | Not established here | Not established here | Not established here |
The table separates published specifications from information that requires model-specific checking. It does not claim that one lens is sharper, focuses faster or stabilizes better than another.
Compatibility: a step-by-step check before buying
- Identify the camera body exactly. Write down the manufacturer, model and sensor format. “APS-C,” “full frame” and other formats are not interchangeable for this decision.
- Identify the lens mount. Match the mount marking in the listing to the camera system. A focal length and aperture match do not make an incompatible mount usable.
- Check the format warning. The 50-120mm is specified for APS-C. Sigma warns that the 50-150mm DC lens vignettes on sensors larger than APS-C. If you use a full-frame body, stop and verify coverage before purchasing either APS-C lens.
- For a 70-200mm, record the complete model name. Include the generation, mount and any model suffix. Do not rely on “70-200mm” alone.
- Read the manufacturer’s compatibility information for that exact combination. Adapter statements are model-specific. The documented Nikon F-to-Z example with an FTZ adapter does not establish compatibility for another lens or body.
- Confirm the seller’s version. Used listings can omit the mount, and photos may show a different version than the description. Ask for a clear mount photo and the exact product designation.
- Check return terms. If the lens is discontinued or used, a return window gives you time to test mounting, aperture control, autofocus communication and image coverage on your own body.
Which lens fits common shooting situations?
Portraits on an APS-C camera
The 50-120mm’s approximately 75–180mm equivalent range covers the tighter perspective many APS-C portrait shooters seek, while its constant F2.8 keeps the maximum aperture consistent as you reframe. The 50-150mm offers a longer 150mm physical end, which may help when you need more working distance, but its discontinued status makes condition and mount verification mandatory.
Outdoor events and travel
Portability favors the 50-120mm on the evidence available: 99mm and 390g are explicitly specified by Sigma. Those measurements make it a practical companion when you expect to carry the camera for hours. A 70-200mm may be preferable if the exact model’s reach and body compatibility are more important than a compact kit, but compare its actual dimensions and weight before deciding.
Subjects that are far away
The 50-150mm and 70-200mm options reach farther than 120mm or start at a longer focal length. That can reduce the need to crop or move closer, but focal length is only one part of the decision. Sensor coverage, mount, autofocus communication and the physical burden of the lens can outweigh the extra reach.
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Mixed-format camera ownership
If you alternate between APS-C and full-frame bodies, do not assume the 50-120mm or 50-150mm will serve both systems. The 50-120mm is an APS-C lens, and Sigma’s warning for the 50-150mm specifically addresses vignetting on larger-than-APS-C sensors. A 70-200mm designed for the larger format may be the more flexible choice, but only if its exact mount and body compatibility are documented.
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Used-market checklist for the discontinued 50-150mm
- Mount: Confirm whether the copy is SA, Canon EF or Nikon F, and match it to your camera or documented adapter.
- Sensor format: Use it with an APS-C body unless you have authoritative documentation for another configuration. Sigma warns of vignetting on larger sensors.
- Optical condition: Inspect front and rear elements, internal haze, fungus, scratches and coating damage under a bright light.
- Mechanical condition: Check zoom and focus rings for uneven resistance, looseness or grinding.
- Electronic operation: Test aperture control, autofocus communication and any camera-side error messages before the return period ends.
- Included parts: Verify caps, hood, case and tripod-collar components if the listing promises them; missing accessories affect practical value.
- Seller evidence: Request the serial label and photos of the actual lens, not generic product images.
Discontinued does not automatically mean unusable. It does mean that support, stock and replacement options may differ from those for a current lens, so the copy’s condition deserves close attention.
Availability and pricing cautions
A contemporaneous launch report announced Sony E, Fujifilm X and Canon RF variants of the 50-120mm, with an October 22 on-sale date and US and UK prices. Those were launch details reported on October 8, 2026, not a guarantee of stock or price in your region today. Check the current manufacturer listing and local retailers for the mount you need.
No current regional price, retailer inventory or complete mount-by-mount availability is established here. Avoid treating an old launch price as a present quote, especially for a discontinued 50-150mm or a used 70-200mm whose condition can change its value substantially.
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What this comparison cannot establish
The supplied specifications do not provide a controlled, version-matched test of resolution, contrast, chromatic aberration, autofocus speed, stabilization effectiveness, flare resistance or bokeh. They also do not provide normalized dimensions and weights for the 50-150mm and a specific 70-200mm. Those differences can be important, but they require an exact model and comparable testing.
Use the verified facts for the initial decision: format, focal range, constant aperture, published size and weight, discontinued status and documented compatibility. Then consult the exact model’s current technical page and return policy before committing to a purchase.
Quick Recap
Decision guide
- Choose the 50-120mm if you own an APS-C camera, want constant F2.8, value a compact 99mm/390g design and need approximately 75–180mm-equivalent coverage.
- Consider the 50-150mm only if you are comfortable buying discontinued equipment, need its longer 150mm end and can verify an APS-C body, correct mount and good used condition.
- Choose a 70-200mm when a particular model’s reach, sensor coverage and camera compatibility solve a requirement the APS-C zooms cannot. Compare the complete model rather than the focal-range label.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
