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5

The focal length is the focal length and is a property of the lens. Aperture is the ratio of opening to focal length. The size of the sensor doesn't enter into the calculation at all. Don't overthink this. A 35mm full frame lens on an APS-C body will give the same image as a 35mm APS-C lens on an APS-C body (accounting for differences in build quality, of ...


4

Where you seem to be confused is the idea that a FF lens collects more light than an APS-C lens with the same focal length and aperture. Whether this is true or not depends on exactly how one defines more. In terms of total photons collected the FF lens does collect more, but it does so only because it collects them from a wider angle of view and projects ...


3

I just spent a few weeks with the viltrox 85mm f/1.8 for a review project I've been working on and I've shot the Sony FE 85mm f/1.8 in the past. It's not quite as perceptually sharp or punchy as the Sony and the colors aren't as vibrant. Chromatic aberration is definitely a lot more noticeable on this lens than the Sony and of course, it's heavier and manual ...


3

Sony has made this super confusing by using alpha (α) —which is commonly rendered "A" — in the names of these E-mount cameras. (Thanks, Sony!) The current scheme seems to be: α followed by two digits = A-mount; all others (one digit, four digits, one digit and some letters, whatever) are E-mount. In addition to their "common names", these cameras also have ...


2

The problem is that sensors hate it if light hits them in all too angled a fashion, so short focal length lenses that are simply very close to the sensor and project light in a "wide funnel" fashion can create surprises (eg color vignettes or very bad corner performance). The most radical option is using an 28mm or 35mm rangefinder or enlarger lens of true ...


1

The focal length of the Sony E 18-20 lens is 18mm to 200mm, as per the lens name. Since it is designed for an APS-C sensor, it gives the same field of view as a 27-300mm lens which is the 35mm Equivalent Focal-Length. This is what it says on the Product Details section of the lens page as you can see here. Unfortunately it appears you found a page with ...


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