Actual Focal Length of the Tamron 70-300mm f/4-5.6 lens for Sony a7iii
15644
What is crop factor and how does it relate to focal length?
86838
What do the red values mean on the distance scale of a lens?
105343
Interference at the focus of a convex lens or a concave mirror
57370
What are the limitations of a typical kit lens as a general purpose lens?
30788
Is the camera sensor or the lens the limit to resolution?
51290
Does my crop sensor camera actually turn my lenses into a longer focal length?
141557
Is Sigma 150-600mm f 5-6.3 contemporary "F4-5.6" on Crop Sensor?
111238
Can you extend a Canon Rebel T5's exposure length?
47315
How needed is the Image Stabilization on the Canon 70-200 f2.8 L USM lens?
12994
Is it physically possible to build a long zoom (17-300 mm for example) at an aperture value of around 1.4 or 1.2?
47999
How do you find out the "sweet spot" of a lens?
113839
How can I visualize or simulate the effect of different focal lengths?
85191
Are manufacturers' Image Stabilisation ratings for zoom lenses deceptive?
31158
Is it a wise-decision to buy full-frame lenses for use on an APS-C body?
104812
What differences exist between third-party and official lenses for Canon APS-C DSLRs?
94098
How can I find infinity focus on a kit lens with no markers?
139331
Why doesn't exposure change when changing focal length?