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Forum: Pentax SLR Lens Discussion 10-24-2016, 06:40 AM  
Stacking HD 1.4 TC on a Tamron 70-200 f2.8 or the 1000€ Question
Posted By BigMackCam
Replies: 15
Views: 2,131
The thing is, 70-200mm is only a classic focal length range on a 35mm film or full-frame digital camera. If you want to gain experience of that using your APS-C cropped-sensor camera, you need something like the DA*50-135, which has a field of view equivalent to 75-202mm on full frame (the DA*50-135 was designed specifically for the APS-C sensor to give an equivalent field of view to the classic 70-200 on full frame). On full-frame, 200mm isn't all that long. With my (non-Pentax) full-frame camera I use a Tamron 150-600mm lens for long tele shots...
Forum: Pentax SLR Lens Discussion 10-23-2016, 11:12 AM  
Stacking HD 1.4 TC on a Tamron 70-200 f2.8 or the 1000€ Question
Posted By BigMackCam
Replies: 15
Views: 2,131
The 60-250 works very well with the HD DA 1.4x rear converter. Somewhat unexpectedly, I find myself using that combo for closer subjects (which makes up for the hefty focus breathing, to some extent) and running without the converter for longer distances.
Forum: Pentax SLR Lens Discussion 10-23-2016, 10:25 AM  
Stacking HD 1.4 TC on a Tamron 70-200 f2.8 or the 1000€ Question
Posted By BigMackCam
Replies: 15
Views: 2,131
What distance are the subjects you're typically capturing? The reason I ask is that most telephoto zoom lenses (including most 70-200 designs), and certainly the DA*60-250, use internal focusing and suffer from focus breathing. At close range, the 60-250 (for example) might only give you a 150mm field of view and magnification, whereas at greater distances, you'll get the full (or near enough full) 250mm. A prime like the DA*300 will give you the same field of view at pretty much any distance (or if there is any breathing, it's minimal)...
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