Why use Pentax?

Started Mar 18, 2013 | Questions thread
Gerry Winterbourne
Veteran MemberPosts: 7,892
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Re: Why use Pentax?
In reply to ultimitsu, Mar 22, 2013

ultimitsu wrote:

Why criticize Pentax for having a 50-135mm f2.8?

I am not criticising Pentax for having it. I am just saying pentax goes out its way to make lenses of unconventional FL to avoid comparison.

You may be saying it but that doesn't make it true.

I am not saying it is a bad thing, i am just saying that is what it is, and it is true.

You admit in another post that you don't know Pentax's reasons, so how can claim that your speculative statement is true?

For FF 35mm film 70-200 is a common zoom range developed over the years because it suits a lot of photographic needs for different fields of view.

Well, I dont see it like that.

Are you saying that 70-200 isn't a common zoom range?

Beside 70-200 there is also 70-300, 75-300, 100-400 and 80-400, they all seem to be selling OK, 70-200 on a APs-C is just like a lens between 75-300 and 100-400 on FF. Many canikon aps-c users use them and love that FL.

So what?  Your original point was about the Pentax 50-135 and I've dealt with that.  Other FLs, no matter how interesting in themselves, have nothing to do with that subject.

The 43/1.9 was designed to have the same FL as the image circle of FF 35mm lenses, making it - by a common definition of the term - the only true "normal" lens. Again, this was designed for the benefit of users.

43mm on apsc is like 65mm on FF, It is indeed a weird FL, I have never seen a 65mm prime on FF. for 50mm effective FOV most aps-c users use 30mm or 35mm lens, 35mm lenses are plenty and sigma makes a 30mm DX lens. So by making a 43mm, Pentax is indeed go out its way to make it hard to compare.

Of course it's weird on APS-C - so are most lenses that were designed for FF.  I explained why 43mm was chosen; again, you talk of different FLs that  no matter how interesting in themselves, have nothing to do with that subject.

The FA 31, 43 and 77 are widely regarded as among the very best lenses produced.

I am sorry but this is the first time I heard that they "are widely regarded as among the very best lenses produced".

Try this, then http://www.northcoastphotographer.net/files/7a6bf1d209118e0d9790f4d66274c8b1-124.html

A quick check on photozone shows that 77mm and 43mm both have very weak corner performance and rather bad purple fringing, Canon and nikon 85 f1.8G both beat 77 in performance and price. Nikon's 50 F1.8G would both beat 43mm in performance and price (no comparable canon in that price/speed class).

Which just goes to show that relying on numbers alone is a foolish way to assess lens performance.

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Gerry
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First camera 1953, first Pentax 1985, first DSLR 2006
http://www.pbase.com/gerrywinterbourne

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