Why do you buy fast lenses/cameras?

Started 3 months ago | Polls thread
Michael Fryd
Michael Fryd Forum Pro • Posts: 11,568
Re: Why do you buy fast lenses/cameras?

Lee Jay wrote:

Michael Fryd wrote:

Mackiesback wrote:

Michael Fryd wrote:

Don't forget:

  • Brighter Viewfinder
  • More accurate auto focus
  • They tend to be sharper (a high quality f/2.8 lens is likely sharper at f/3.5 or f/5.6 then a lens with a maximum aperture of f/3.5).
  • The wider apertures tend to be bundled with other features (i.e better build quality, weatherproofing, better optical quality).

That would be option number 4.


But if the goal is to understand why people buy fast lenses, you probably don't want a survey where lot's of people select "other."

Right now we're at 2.4% other, so I think we're good.

The problem is that you don't know how many people chose not to respond because they didn't see their reason listed.

Suppose you get an even response with no more than 20 people selecting any one answer.  If there were 200 people who didn't answer, you don't have answers from over 70% of your audience, and that 70% is self selected to probably be those who would have selected "other".

The questions on the survey guide the responses.   One has to be very careful with designing the questions.   If you want to find out why people make decisions, you don't want to influence the results.  If you want to make a point, then you want to influence the results to support your position.

Here's a simple example of how words influence people, which is a better sale:

  • Up to 20% off on all items!
  • No more than 20% off on any item.

To most people, the former sounds like a better deal, but both say exactly the same thing.

Most Americans favor one of two political parties.  Let's call them "A" and "B".  Suppose there was a third party "C" favored by about 5%.

There's a big difference between the survey:

What party do you favor:

  • A
  • B
  • other


  • A
  • C
  • other

People are more likely to answer if they see their preference listed.  People who favor party "A" are likely to answer either survey.

People who favor "B" are more likely to answer the first survey, and not bother with the second.

Therefore the first survey should be used if you want a more accurate result.  The second should be used if your goal is to inflate the number of people who favor party "A".

 Michael Fryd's gear list:Michael Fryd's gear list
Nikon Coolpix AW130 Canon EOS D60 Canon EOS 7D Mark II Canon EOS 5DS Canon EOS 5D Mark IV +16 more
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