WILLIAM MURPHY 22 APRIL 2025
I am considering a Sony teleconverter with my new 70-200mm f/2.8 GM OSS II lens, especially given its macro capabilities. While I was previously advised against them, the dealer’s suggestion to consider one now, particularly the 1.4x, makes sense given the advancements in both lenses and teleconverters. At โฌ600 each, it’s a considered purchase so I have yet to decide as I have only suitable lens but maybe one could be suitable for the rumoured 50-150mm F2 โฆ assuming that it is announced 23 April 2025.
Sony Teleconverter Performance with Newer 70-200mm Lenses: A Comparative Analysis
Introduction: Setting the Scene – Teleconverters and the Sony Ecosystem
Teleconverters are valuable tools for photographers, providing a means to extend the reach of existing lenses without the immediate need for an entirely new optic. By magnifying the image projected by the primary lens, they bring distant subjects closer, effectively increasing the focal length. This capability can be particularly advantageous in scenarios where physical proximity to the subject is limited, such as wildlife or sports photography.
However, the integration of additional optical elements into the light path inherently introduces potential trade-offs, most notably concerning image quality and light transmission. Historically, the use of teleconverters has been met with varying degrees of acceptance, with some photographers embracing the added versatility and others wary of the potential for image degradation. Within the Sony ecosystem, past perceptions of teleconverter performance, especially concerning the 2x models, have often leaned towards caution, with recommendations frequently advising users to prioritise native lenses for optimal results.
This blog post aims to re-evaluate this perspective in light of Sony’s advancements in both lens and teleconverter technology, specifically focusing on the performance of current teleconverter models when paired with the more recent iterations of their popular 70-200mm lenses. The central objective is to investigate whether these newer combinations have overcome the limitations of the past and to provide a comprehensive analysis comparing the utility of a teleconverter versus the acquisition of a dedicated lens with a longer focal length.
A Look Back: The Historical Performance of Sony Teleconverters
Historically, the performance of Sony teleconverters has been a subject of discussion among photographers, with a general understanding that the 1.4x model offered a more practical balance between increased focal length and minimal impact on image quality compared to its 2x counterpart.
Many users in the past found the 2x teleconverter to introduce a level of image degradation that often outweighed the benefits of the doubled focal length. This historical viewpoint suggests that while the concept of extending lens reach was appealing, the execution, particularly with the 2x models, presented challenges in maintaining the high optical standards expected by serious photographers. This prior understanding forms a crucial backdrop against which the current performance of Sony teleconverters with newer lenses must be evaluated, as the user’s query directly stems from this historical context.
The fundamental principles of optics dictate that inserting additional glass elements, as teleconverters do, can lead to certain compromises. These typically manifest as a reduction in the amount of light reaching the camera sensor, effectively decreasing the lens’s maximum aperture. For instance, a 2x teleconverter reduces the aperture by two full stops, while a 1.4x converter results in a reduction of approximately one stop. This loss of light not only affects the photographer’s ability to shoot in low-light conditions but also impacts the depth of field achievable. Furthermore, the magnification process inherent in teleconverters can also amplify any existing optical aberrations in the primary lens, potentially leading to a decrease in overall sharpness, contrast, and an increase in chromatic aberration. These inherent limitations are important to acknowledge when considering the overall utility of teleconverters.
Adding to these optical considerations, Sony’s teleconverters have historically been designed with specific compatibility in mind. They are not universally applicable to all lenses within the Sony E-mount system. Instead, they are engineered to work seamlessly with a select group of their higher-end native lenses, often identified by their white barrels. This limited compatibility means that a photographer must either already own or plan to purchase one of these designated lenses to take advantage of Sony’s teleconverter offerings. This restriction influences the decision-making process, as the investment in a compatible primary lens is a prerequisite for utilising the teleconverter.
The Modern Era: Evolution of Sony 70-200mm Lenses and Teleconverters
In recent years, Sony has introduced significant advancements in its lens technology, including notable updates to its popular 70-200mm lens lineup. The Sony FE 70-200mm f/2.8 GM OSS II (SEL70200GM2) represents a substantial evolution from its predecessor, boasting a remarkable weight reduction of approximately 29%. This lighter build enhances handling and portability, making it a more appealing option for a wider range of photographers. Beyond the reduction in weight, the Mark II version also incorporates improved features, enhanced autofocus capabilities, and advancements in image quality performance. Its autofocus system, driven by XD (extreme dynamic) linear motors, is notably faster, with claims of being up to four times quicker than the original model. These improvements suggest a lens that might interact more favourably with teleconverters than previous generations.
Similarly, Sony has also released the FE 70-200mm f/4 Macro G OSS II (SEL70200G2), which introduces a unique half-lifesize (0.5x) macro capability across its entire zoom range. This lens also benefits from a more compact and lighter design compared to its predecessor. Furthermore, it retains the ability to use Sony’s teleconverters, which, when coupled with its macro functionality, allows for even greater close-up magnification (up to 0.75x with the 1.4x TC and 1:1 with the 2.0x TC). The inclusion of macro capabilities alongside teleconverter compatibility positions this lens as a versatile tool for photographers with diverse shooting needs.
Complementing these lens advancements are Sony’s current 1.4x (SEL14TC) and 2x (SEL20TC) teleconverter models. User reviews for the SEL14TC often highlight its excellent picture quality and ease of use, with positive experiences reported even when paired with the new 70-200 F4 G II.
Similarly, some users of the SEL20TC have shared positive feedback, noting excellent results even with lenses like the 100-400GM. However, it remains important to acknowledge the inherent optical principles, as reviews of the FE 2x Teleconverter still mention the two-stop light loss and a reduction in overall image quality as distinct penalties. Despite these limitations, the continued availability and positive user experiences suggest that Sony has refined its teleconverter designs to better complement its evolving lens technology.
Performance Analysis: Newer Teleconverters and 70-200mm Lenses
The 1.4x Teleconverter: Balancing Reach and Image Quality
Analysis of user reviews and test results indicates a generally positive reception for the Sony 1.4x teleconverter (SEL14TC) when used with both the newer 70-200mm f/2.8 GM OSS II and f/4 Macro G OSS II lenses. Many users find that this teleconverter strikes a favourable balance between extending the focal length and maintaining a high level of image quality. For instance, one user specifically noted that the SEL14TC “works a treat” and delivers excellent picture quality when paired with the new 70-200 F4 G II. Similarly, a user of the 70-200mm II found it to be remarkably sharp and to hold up well with the x1.4 converter. This sentiment is echoed by others who consider the decrease in image quality and autofocus performance with the 1.4x TC to be minor and acceptable for the added reach. The combination is even described as versatile, suggesting its practical utility in various shooting scenarios.
When the 1.4x teleconverter is attached, the 70-200mm f/2.8 GM OSS II transforms into a 98-280mm f/4 lens. This provides a useful extension at the telephoto end while only reducing the maximum aperture by one stop. For the 70-200mm f/4 Macro G OSS II, the resulting lens becomes a 98-280mm f/5.6 optic. This combination also offers increased reach with a manageable one-stop reduction in maximum aperture. A user who opted for the 1.4x TC with the F4 G OSS II found it to be “Absolutely worth it,” noting that the magnification was sufficient for their needs and the sharpness was clearly superior to that achieved through digital cropping. This suggests that for many photographers, the 1.4x teleconverter provides a valuable extension of their lens’s capabilities without significant drawbacks.
The 2x Teleconverter: Has Performance Improved?
The performance of the Sony 2x teleconverter (SEL20TC) with the newer 70-200mm lenses appears to be more complex, with a wider range of user experiences reported. While historical perspectives often cautioned against 2x teleconverters due to significant image degradation, some newer feedback suggests potential improvements, particularly when paired with the 70-200mm f/2.8 GM OSS II. One source even suggests that this combination could be a “winner”. A video review noted the autofocus performance of the 2x TC with the 70-200mm f/2.8 GM OSS II as quite impressive. However, other users still observe a softening of the image, especially when critically evaluating sharpness.
When the 2x teleconverter is used, the 70-200mm f/2.8 GM OSS II becomes a 140-400mm f/5.6 lens. This provides a substantial increase in reach, effectively doubling the original focal length, but at the cost of two stops of light. For the 70-200mm f/4 Macro G OSS II, the resulting lens is a 140-400mm f/8 optic. The f/8 maximum aperture in this configuration represents a significant reduction in light-gathering capability, which could limit its usability in less than ideal lighting conditions. User experiences with the 2x TC on the 70-200mm II have been mixed.
One user initially found disappointing results at f5.6 but noted a considerable improvement in contrast and sharpness when stopping down to f8, achieving results comparable to the GM 100-400mm.
Another user reported being “more than happy” with the 70-200 II when used with both teleconverters, suggesting satisfactory results even with the 2x. However, there is also the perspective that the 2.0x TC might be pushing the limits of the f4 G II lens. The general consensus still leans towards the 1.4x being the better option for maintaining image quality, but the performance of the 2x with the newer, high-quality 70-200mm lenses appears to be better than historical perceptions might suggest.
The Fork in the Road: Teleconverter vs. Dedicated Longer Lens
For photographers seeking to extend their telephoto reach with a Sony system, the decision often comes down to whether to use a teleconverter with an existing lens, such as a 70-200mm model, or to invest in a dedicated lens with a longer native focal length, such as the Sony FE 100-400mm f/4.5-5.6 GM OSS or the Sony FE 200-600mm f/5.6-6.3 G OSS. Each approach offers its own set of advantages and disadvantages across various performance parameters.
Image Quality: A Pixel-Level Examination
When evaluating image quality, the consensus generally favours dedicated longer lenses over using a 70-200mm lens with a 2x teleconverter, particularly when scrutinising images at a pixel level. While some users find the image quality at 400mm to be surprisingly similar between the 70-200 F2.8 GM II with a 2x TC and the 100-400mm GM F4.5-5.6, the dedicated lens often exhibits better control over chromatic aberration. Some users have reported a noticeable softening of images when using the 2x TC on the 70-200GM II. Conversely, the 1.4x teleconverter tends to have a less pronounced impact on image quality, offering a more subtle trade-off for the increased reach. The Sony 100-400mm GM OSS is often regarded as a sharper lens than the 200-600mm G OSS, although the latter provides significantly more reach. Adding a 2x teleconverter to the 100-400mm can lead to a noticeable reduction in overall image quality, especially in terms of sharpness at the corners. Ultimately, while the 70-200mm with a teleconverter offers flexibility, photographers prioritising the highest possible image quality at longer focal lengths will likely find a dedicated lens more appealing.
Autofocus Performance: Speed and Accuracy Under Scrutiny
Autofocus performance with teleconverters has seen improvements, particularly with newer Sony camera bodies and lenses. While some older reports indicated a noticeable slowdown in autofocus speed when using a 2x teleconverter, more recent experiences, especially with the 70-200mm f/2.8 GM OSS II, suggest that the autofocus remains quite responsive even with the 2x TC. The Sony 100-400mm GM OSS and 200-600mm G OSS lenses are both known for their capable autofocus systems, which are often preferred for demanding action and wildlife photography. However, even these dedicated lenses can experience a slight reduction in autofocus speed and accuracy when used with teleconverters. The 70-200mm f/2.8 GM OSS II is particularly noted for its rapid autofocus capabilities, which may help to mitigate some of the potential slowdown associated with using a teleconverter.
Aperture and Low-Light Capabilities: The Trade-offs
The use of teleconverters invariably results in a reduction of the lens’s maximum aperture, which directly impacts its low-light performance. The 70-200mm f/2.8 GM OSS II, when paired with a 2x teleconverter, becomes a 140-400mm f/5.6 lens. This is still a relatively fast aperture compared to the native f/4.5-5.6 of the 100-400mm GM OSS or the f/5.6-6.3 of the 200-600mm G OSS. However, the 70-200mm f/4 G OSS II with a 2x TC results in a much slower f/8 aperture, which could be limiting in lower light conditions. The 70-200mm f/2.8 model retains a low-light advantage even with the teleconverter compared to the dedicated longer lenses. When teleconverters are added to the 100-400mm or 200-600mm, the maximum aperture becomes even narrower, further impacting their low-light capabilities.
Physical Attributes: Size, Weight, and Ergonomics
The Sony 70-200mm lenses, particularly the GM II, are significantly lighter and more compact than both the 100-400mm GM OSS and the 200-600mm G OSS. Adding a teleconverter does increase the size and weight of the 70-200mm, but the resulting package is generally still more portable than the dedicated longer lenses. The internal zoom mechanism of the 70-200mm f/2.8 GM OSS II is also preferred by some users over the external zoom of the 100-400mm. For photographers who prioritise portability and ease of handling, the 70-200mm with a teleconverter can be an attractive option.
Cost-Benefit Analysis: The Financial Implications
From a purely financial perspective, purchasing a teleconverter is generally more cost-effective than investing in a dedicated longer lens. This can be a significant factor for photographers who only occasionally require the extended reach. For instance, using a teleconverter with an existing 70-200mm lens to achieve a 400mm equivalent is less expensive than buying a separate 100-400mm or 200-600mm lens. However, if the longer reach is a frequent requirement, the benefits of the potentially superior image quality and handling of a dedicated lens might justify the higher cost.
Voices from the Field: User Experiences and Community Insights
The experiences shared by Sony users on various photography forums and review sites provide valuable real-world perspectives. There is a general consensus that the 1.4x teleconverter performs admirably with the newer 70-200mm lenses, offering a good balance of reach and image quality. Opinions on the 2x teleconverter are more varied, with some users reporting satisfactory results, especially with the f/2.8 GM OSS II, while others still observe a noticeable softening of the image.
In terms of use cases, the 70-200mm with teleconverters is often favoured for its versatility and portability in scenarios like travel and general photography. For wildlife and sports photography, where longer reach is often paramount, dedicated lenses like the 100-400mm and 200-600mm are frequently recommended, although the 70-200mm f/2.8 GM OSS II with a teleconverter can serve as a more portable alternative for certain situations.
Making the Informed Decision: Recommendations Based on Usage Scenarios
For wildlife photography, while the 70-200mm f/2.8 GM OSS II with a 2x teleconverter can provide a more portable option, the Sony 200-600mm G OSS or the Sony 100-400mm GM OSS (potentially with a 1.4x teleconverter) are generally better suited due to their longer native reach and often superior image quality at those focal lengths. The f/4 model with a 2x TC might not be ideal for serious wildlife work due to the slower aperture.
In sports photography, the Sony 70-200mm f/2.8 GM OSS II, either by itself or with the 1.4x teleconverter, stands out as a versatile choice offering fast autofocus and good reach for many situations. The 2x teleconverter can extend the reach further, but the potential for softness and the f/5.6 aperture should be considered, especially in lower light.
For portrait photography, the 70-200mm range is excellent on its own, and teleconverters are typically not necessary unless extreme compression is desired.
For travel and general use, the 70-200mm f/2.8 GM OSS II or the f/4 Macro G OSS II with the 1.4x teleconverter offer a compelling combination of versatility and portability, providing increased reach without excessive bulk. The 2x teleconverter can provide even more reach but with more noticeable compromises in image quality and aperture.
Conclusion: Weighing the Options – Versatility vs. Specialisation
In conclusion, the performance of Sony teleconverters, particularly the 1.4x model, has indeed improved with the latest generation of 70-200mm lenses, offering a more viable option for extending focal length than in the past.
The 2x teleconverter also shows enhanced performance, especially with the 70-200mm f/2.8 GM OSS II, although it still involves more significant trade-offs in terms of image quality and light loss.
The decision of whether to opt for a teleconverter or a dedicated longer lens hinges on the photographer’s specific needs and priorities. Teleconverters provide a cost-effective and versatile way to increase reach without carrying multiple large lenses, making them suitable for photographers who need occasional extra magnification and prioritise portability. However, for those who frequently shoot distant subjects and demand the highest possible image quality, investing in a dedicated lens like the 100-400mm GM OSS or the 200-600mm G OSS is likely the more rewarding long-term solution.
Ultimately, the optimal choice depends on a careful consideration of the trade-offs between versatility, cost, image quality, and the primary photographic pursuits of the user.