On 16 February 2013 01:52, Aahz Maruch <a...@pobox.com> wrote: > On Fri, Feb 15, 2013, Rob Studdert wrote:
>> When it's a 10-20mm zoom perhaps? > > Again, when would you use that instead of e.g. a 14mm? I'm looking for > specific use-cases, particularly from people who use both zooms and > primes. Well in my case I own many primes and zooms covering the same focal lengths, what determines the lens that I turn to for any particular shoot or event is a function of many factors. In its simplest form If I need flexibility in framing and the ability to change the FL fast and if the slight loss of speed wont pose a problem due to slower shutter speeds and if I don't need absolute premium image quality then I'll reach for the zoom. If I can handle the weight and I a fixed FL isn't an issue and I want to optimize IQ then I'll often consider a prime. Of course this is very general, there are many other factors to consider such as AF speed, propensity to flare, sensitivity to blooming, CA characteristics, contrast, edge performance, geometric distortion. It's a complex issue and the only way to keep it simple I guess is to not buy lenses with overlapping FL and just learn to deal with each lenses particular limitations. Specifically in the case that I mentioned my 10-20/3.5 zoom is actually a bit smaller and lighter than my FF 14/2.8 lens but both have their good and bad points so for now I will keep both. -- Rob Studdert (Digital Image Studio) Tel: +61-418-166-870 UTC +10 Hours Gmail, eBay, Skype, Twitter, Facebook, Picasa: distudio -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
