Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-10-2017, 12:52 PM - 1 Like   #31
Loyal Site Supporter
Loyal Site Supporter
clackers's Avatar

Join Date: Jul 2013
Location: Melbourne
Photos: Albums
Posts: 13,633
Igor, the numbers you've crunched are about the owners, not the lenses themselves, psychological data rather than physical.

DxOmark had an old list of Pentax lenses with their highest scores. I can find it for you if you like.



10-10-2017, 02:05 PM - 5 Likes   #32
Bad LBA case
Loyal Site Supporter
Douglas_of_Sweden's Avatar

Join Date: Apr 2008
Location: Stockholm
Photos: Gallery
Posts: 3,376
The problem with lens reviews like the one on Pentax Forum is that most users only have experience of a small number of lenses. And people tend to like their gear, sometimes with passion. This causes a lot of 7th, 8ths and 9ths given to very average lenses that should have been given a 4, 5 or 6. So there is a lot of inflation in that rating system.

I have a little bit over 100 Pentax/Takumar prime lenses. Among those the best lense in my oppinion is the SMC Pentax A*135mm f1.8. The problem with its Pentax rating is that it is very rare, and therefore there are few reviews, so one very negative review is able to take down its average rating (it gets eleven 10ths, one 9th and one 3rd! That 3 value takes down the average from 9.92 to 9.38. In my oppinion, Adam should remove that review!). That review is either by someone who had a broken lens or did not undestand how razor thin the DOF is at 135mm f1.8 and hence failed to focus. His rating is enough to bring down the lense from the absolute top of average lens ratings. That is another weakness of that sort of rating system. Exceptional, but very rare lenses, becomes voulnerable to outlayer ratings. But I have this lens, and among its many fantastic properties, it is sharper wide open than any of the FA*-lenses, the A*85, FA*300, or any of the 35, 50 or 100mm macro lenses of Pentax that I have compared it with.

It is possible that the both A* and FA* 200mm macros might beat the A*135. But I don't have those lenses....still on the shopping list.

Neither do I have the 400 or 300/2.8s on your list. But the F*300/4.5 is optically the same as the FA*300/4.5, which I have, and that's also a very good lense that might belong in the top 10. The same applies to the DA35ltd macro, one of the best APS-C designs of Pentax. The K30/2.8 is a very nice lense, but it don't belong in the top 10. It has for some reason a very exclusive reputation, which elevates it above its actual (already good) quality.

A poll like tha one Adam made that elevated the FA77ltd, is in its nature partly a popularity competition. Lenses like the 200mm macros and the A*135 are too rare to show up there. It requires a lens that is both very goid (but not necessarily the best) and which sold well. That description fits the FA77ltd.

Fotnote: The FA77ltd, which didn't make it into the top 10 average ratings, uses the same optical design as the A*85, which made it into the top 10. They just tweaked focal length and speed slightly, which isn't a big loss, since the A*85/1.4 is soft wide open.

---------- Post added 10-10-17 at 11:50 PM ----------

QuoteOriginally posted by IgorZ Quote
In general though, there seems to be little relationship between price and quality as expressed by lens rating. That might not be surprising though, as no lens is rated below 7.7.

7.7! Well, there you have it. PFs lens reviews suffers as badly from inflation as I suffer from LBA. All these users who give their kit zoom 8 or 9 in rating... And equally bad: everyone who gives a 9 or 10 to the first full metall manual focus lens they hold, even if it's an average good mass produced 28, 50 or 135mm from the 70s. That's what gives us review ratings that appears to contradict themselves.
10-10-2017, 03:38 PM   #33
Site Supporter
Site Supporter




Join Date: May 2016
Photos: Albums
Posts: 1,394
The FA77 got a 9.73! The #10 top lens above got a 9.76; it seems that is enough for margin of error...

But on the other hand, in order to get these 9+ ratings, many people must have given a 10! I am not entirely sure what it means for a lens to be a 10 -- absolutely perfect? And what if a better lens comes along later, well, I guess you can't give it more than a 10?

---------- Post added 10-10-17 at 03:39 PM ----------

When the DFA WR Limited primes come out, we'll have to make it go to 11!
10-10-2017, 04:31 PM   #34
Senior Member




Join Date: Aug 2016
Location: Dublin
Posts: 158
I'm using F28mm f2.8, FA 43mm F1.9 Ltd, and FA 77mm F1.8 Ltd. All three lenses are just awesome but my best lens ever is FA 77mm F1.8 Ltd, this lens is just wow and gets a second breath on K-1. For walking I chose D-FA 24-70mm F2.8 with is superb walk around zoom lens.

I heard the best lens is lens which you have at the moment with you

10-10-2017, 04:51 PM   #35
Pentaxian
jddwoods's Avatar

Join Date: Nov 2012
Location: Newark, Delaware
Posts: 947
I guess this more not just what is the best prime but the favorite. I have a bunch, all of the DA Limiteds, F 28mm f2.8, FA 50mm f1.7 and DFA 100 Macro WR. Out of what I have I would have to say its the DFA 100 macro WR. versatile as both macro and compact lightweight telephoto. If my DA 70 Limited didn't have so much wobble in the inner barrel, (lowers impression of build quality) I might call that my best prime. Its super sharp, in the same league as the DFA 100 macro and incredibly compact.
10-10-2017, 04:53 PM - 1 Like   #36
Loyal Site Supporter
Loyal Site Supporter
monochrome's Avatar

Join Date: Mar 2008
Location: St. Louis, MO
Photos: Gallery | Albums
Posts: 25,594
QuoteOriginally posted by jimr-pdx Quote
Definitely the k 17/4 fisheye sorry no experience with most of the others..
It has become our nature to desire to measure, score, sort and rank anything and everything. Scoring, Sorting and Ranking are steps in Critical Thinking Theory. So we start with a:
  • Standard, which are the characteristics we all agree are Good and none bad, but the
  • Comparative has a Better presentation of those characteristics, so it is sorted to a higher rank, then
  • Superlative, which is the Best example of the Standard, ranked the highest.

Unfortunately we don’t agree on Good, so we can never agree on Best. That’s why DxO is often consulted, yet often denigrated, and why a large number of quite different lenses achieve the same high PF Rating scores.

Last edited by monochrome; 10-10-2017 at 06:35 PM.
10-10-2017, 06:11 PM   #37
Pentaxian
photoptimist's Avatar

Join Date: Jul 2016
Photos: Albums
Posts: 4,050
One way to deal with some of the weirdness of the relationship between price and ratings is to plot a scattergram of all lenses on price and rating and only look for lenses with the highest possible rating for a given budget or the lowest possible price for a given rating. That is:

1) What's the highest rated lens for under $50, under $100, under $200, and so on? Or:

2) What's the lowest cost lens that gets at least an 8.0, an 8.5, a 9.0, or a 9.5 rating?


(P.S. For nerds, this scattergram and the set of lenses with superior ratings for their price or superior price for their ratings is called the Pareto frontier in economics.)
10-10-2017, 06:17 PM - 1 Like   #38
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 49,299
It's official, the 77mm is best!

The FA 77mm Limited is the Greatest Pentax Lens - Pentax Lens Tournament | PentaxForums.com


Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

10-10-2017, 06:30 PM   #39
Veteran Member
Ikarus's Avatar

Join Date: Apr 2010
Location: California
Photos: Albums
Posts: 484
QuoteOriginally posted by normhead Quote
Naw, that's not it...

Such a procedure won't change rank because there is no way for one lens to pass another, if you subtract the same number from all lenses, you maintain rank.
Well, let's just try, shall we? Previous first three:

1 SMC Pentax-M 50mm F2 8.22 24 (91) 2.92
2 SMC Pentax-A 50mm F2 7.84 34 (63) 4.34
3 SMC Pentax-M 50mm F1.7 9.38 41 (207) 4.37

Let's say the average lens rating is 8.22 (I don't actually know, I assume it's probably more around 8.5). After mean subtraction, the ranking according to the "mean-subtracted rating divided by dollars ratio" is:

1 SMC Pentax-M 50mm F1.7 +1.17 41 (207) 0.03
2 SMC Pentax-M 50mm F2 0 24 (91) 0
3 SMC Pentax-A 50mm F2 -0.38 34 (63) -0.01

Considering the other lenses on that list all have a rating above 8.22, the two 50mm F2 would actually end up all the way at the bottom. Makes a whole lot more sense like this.

Last edited by Ikarus; 10-10-2017 at 06:35 PM.
10-10-2017, 06:37 PM   #40
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 34,341
QuoteOriginally posted by leekil Quote
Or on the flip side, if you need to take photo as quickly a possible, a zoom might cost you images because you might not be zoomed appropriately when you bring the camera to your eye.
Seriously?
My zoom covers 190mm a prime covers one.
The odds of a zoom being the right focal length? 190 more likely than the prime.
The odds that the zoom will be the right focal length? 190 times less likely than the zoom.

By agreeing to work in 10 mm changes we can cut the number of possible changes on the zoom, to say 19. 19 times more chance of success is nothing to sneeze at.

---------- Post added 10-10-17 at 09:39 PM ----------

QuoteOriginally posted by Ikarus Quote
Well, let's just try, shall we? Previous first three:

1 SMC Pentax-M 50mm F2 8.22 24 (91) 2.92
2 SMC Pentax-A 50mm F2 7.84 34 (63) 4.34
3 SMC Pentax-M 50mm F1.7 9.38 41 (207) 4.37

Let's say the average lens rating is 8.22 (I don't actually know, I assume it's probably more around 8.5). After mean subtraction, the ranking according to the "mean-subtracted rating divided by dollars ratio" is:

1 SMC Pentax-M 50mm F1.7 +1.17 41 (207) 0.03
2 SMC Pentax-M 50mm F2 0 24 (91) 0
3 SMC Pentax-A 50mm F2 -0.38 34 (63) -0.01

Considering the other lenses on that list all have a rating above 8.22, the two 50mm F2 would actually end up all the way at the bottom. Makes a whole lot more sense like this.
I have to admit, I have no idea what you are doing or why you are doing it. You lost me.

Last edited by normhead; 10-10-2017 at 06:45 PM.
10-10-2017, 06:41 PM - 1 Like   #41
Loyal Site Supporter
Loyal Site Supporter
monochrome's Avatar

Join Date: Mar 2008
Location: St. Louis, MO
Photos: Gallery | Albums
Posts: 25,594
FA50/2.8 Macro = 110 Lpmm @ f/5.6.

Done and Done.
10-10-2017, 09:12 PM   #42
Site Supporter
Site Supporter




Join Date: Nov 2014
Location: Auckland
Posts: 246
I carry DA*55, DA 40 XS and DA 70 Ltd in the bag most of the time, the DA*55 is used and loved the most.
10-10-2017, 09:37 PM   #43
Site Supporter
Site Supporter
jimr-pdx's Avatar

Join Date: May 2010
Location: 1hr north of PDX
Photos: Gallery | Albums
Posts: 3,782
QuoteOriginally posted by monochrome Quote
It has become our nature to desire to measure, score, sort and rank anything and everything. Scoring, Sorting and Ranking are steps in Critical Thinking Theory. So we start with a:
  • Standard, which are the characteristics we all agree are Good and none bad, but the
  • Comparative has a Better presentation of those characteristics, so it is sorted to a higher rank, then
  • Superlative, which is the Best example of the Standard, ranked the highest.

Unfortunately we donít agree on Good, so we can never agree on Best. Thatís why DxO is often consulted, yet often denigrated, and why a large number of quite different lenses achieve the same high PF Rating scores.
'tis so. Each of us has our subset of gear and preference of what to shoot, and even two with identical gear will rate their lenses in different order. All answers are for entertainment value; I cannot imagine gleaning my ideal next lens from these chats. Still fun to chime in - though I doubt I've sold anyone on the K17
Attached Images
 
10-10-2017, 10:15 PM   #44
Pentaxian
Jonathan Mac's Avatar

Join Date: Apr 2009
Location: Madrid, Spain
Posts: 6,319
I use the ratings as a quick guide if I find a lens for sale with the general rule that anything under 7.5 is not even worth considering. Beyond that, if I want to get an idea of how a lens performs I read the reviews and look for common praise and complaints.

Just as important as the rating itself is the number of reviews - a rating of ten with only one review has little validity, whereas a rating of ten from a dozen reviews carries a lot of weight. If ratings a have a wide spread rather than being similar it means there's either a lot of sample variation or a lot of variation in photographers and what they look for in a lens. Or a mix of both.

Lens ratings are really qualitative rather than quantitative if they're done by different people using different gear.
10-10-2017, 10:33 PM - 1 Like   #45
Site Supporter
Site Supporter
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 9,940
QuoteOriginally posted by Jonathan Mac Quote
Lens ratings are really qualitative rather than quantitative
And some of them are weapons grade BS.

I absolutely hate questions like this, what is the best lens in X mount?

Sure the Pentax FA*200mm f/4 ED [IF] Macro is the "best" lens, sharp, contrasty - but I can't recall the last time I reached for a macro lens to photograph a landscape*. If you want the best 21mm lens, you will have to switch to Leica. If you want the best 800mm lens? You're going to have to get a Nikon.

All this scrabbling around for the Ne Plus Ultra of 35mm photographic optics can become spirit crushingly expensive, and wasteful. You really want my opinion? I think the SMCP-FA 31mm ASPH Limited lens is the best Pentax lens - why? it does everything well. Aside from some correctable CA issues, the lens can handle any subject matter you can throw at it and deliver an artful rendering of it.

* I'm not saying you cannot photograph a landscape with a 200mm lens. I have personally used 600mm lenses for such purposes, but there isn't much call for it.

Last edited by Digitalis; 10-11-2017 at 05:07 PM.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
200mm, 300mm, 50mm, af, conclusion, f2, f2.8, fa, fa77ltd, k-mount, length, lens, lense, lenses, macro, mm, pentax, pentax lens, pentax-a, pentax-da, pentax-m, ratings, review, reviews, slr lens, smc
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
prime, prime, everywhere a prime... pepperberry farm Pentax SLR Lens Discussion 9457 3 Hours Ago 07:15 AM
Best budget options for a prime 30-35mm f1.2-1.8 AF lens for Pentax APS-C? Rayn Pentax SLR Lens Discussion 28 07-05-2016 02:55 PM
New lenses for Ks-2: 55-300 + 35mm prime or 50mm prime? Sean Hamilton Pentax SLR Lens Discussion 13 05-11-2016 07:37 PM
People The Turkish Prime Minister and the Deputy Prime Minister (photo series/essay) alamo5000 Post Your Photos! 2 04-10-2016 10:09 PM
Pentax prime vs Nikon prime ladybug Pentax SLR Lens Discussion 58 09-19-2010 01:03 PM



All times are GMT -7. The time now is 10:38 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top