Making a superzoom for a compact is easy, but for a DSLR, it's hard?

Started Oct 7, 2013 | Discussions thread
OP Leandros S Senior Member • Posts: 1,970
Re: Getting to the bottom...

MoreorLess wrote:

Leandros S wrote:

MoreorLess wrote:

Leandros S wrote:

People say that interchangeable superzoom ("travel") lenses can't manage good sharpness, yet superzoom compacts do just fine in terms of sharpness. Why is that?

smaller sensors being easer to design lenses for

But why?

A smaller sensor needs a shorter lens with a smaller image circle, these elements make it easier to design.

I still don't find that intuitive. Other than the issue of flange distance, you should be able to scale a bridge camera design up to being an exchangeable lens, and vice versa. Added to that, miniaturising things is technically harder than making them bigger - at least in terms of R&D. At the small scale, imperfections are much more noticeable, so the glass actually needs to be higher quality.

Again though I'd say expectation likely plays into this a lot. A superzoom for a large sensor camera will be judged by much higher standards than a superzoom compact lens.

And yet, I don't hear the superzoom compact reviews droning on about sharpness. In fact, the last time I remember that complaint as referring to the glass rather than the autofocus accuracy was in an HX300V review - that being a 20MP camera!

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