Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-22-2016, 04:17 PM   #1
Forum Member




Join Date: May 2015
Posts: 58
Scores meaning in the Lens Reviews

Lens review:
What are the lens review scores mean?
For example the lens Pentax-DA 50-200mm F4-5.6 ED
The shown scores are:
Sharpness 7.2
Autofocus 6.3

Does 6.3 for autofocus mean that only for 63 photos out of 100 AF worked?
or
only 63 users out of 100 like the lens autofocus?
or
only 63 photos out of 100 are in focus?

Thank you
Leo

09-22-2016, 04:30 PM   #2
Moderator
Loyal Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 9,806
6.3 means the person reviewing it only gives it a 6.3 out of 10 possible points. Ten being the best.
09-22-2016, 04:31 PM   #3
Loyal Site Supporter
Loyal Site Supporter
pacerr's Avatar

Join Date: Jan 2008
Location: Henry, TN
Photos: Gallery | Albums
Posts: 2,910
A purely subjective numerical scale.

Go with the comments as they apply to your experience and needs -- with a touch of salt.

I'd prefer a simpler scale of 'Not Recommended Because...', 'Satisfactory for MY uses as noted', or 'Highly Recommended as noted' backed by explicit comments attributable to a reputable person.

(If you ever got a B- or ... ? in school you'll understand.
09-22-2016, 04:41 PM   #4
Pentaxian
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 26,438
The user comments are always more valuable. Especially since one bad score can seriously affect the rating of a not very popular lens. IF the person does what you do what he says is worth way more than if he does something different. For example with a 70-200 some may use t for organized sports, some may use it for wildlife, if you plan to use it for sports, the wildlife reviews are not as important.

09-22-2016, 04:54 PM   #5
Pentaxian
Na Horuk's Avatar

Join Date: Feb 2012
Location: Slovenia, probably
Photos: Gallery | Albums
Posts: 11,005
It is not objective laboratory test. It is user's feelings. Do not look at numbers as "OMG SO IMPORTANT", instead, look at the review text and sample photos.
09-22-2016, 05:55 PM   #6
amateur dirt farmer...
Loyal Site Supporter
pepperberry farm's Avatar

Join Date: Dec 2014
Location: probably out in a field somewhere...
Photos: Gallery | Albums
Posts: 8,229
any time that I am thinking about a lens, I read the lens reviews here, but I also look at flickr for a wide selection of shots by that lens...
09-22-2016, 08:11 PM   #7
Pentaxian




Join Date: Dec 2010
Location: Ontario
Photos: Gallery
Posts: 2,661
They're averages. Anyone reviewing the lens gets to (or has to?) give a rating from 1 to 10 (whole numbers only) for the different categories. These are averaged and put at the top of the section for that lens, complete with little bars and colours to make it look authoritative. As mentioned, it's pretty subjective how an individual reviewer rates a lens (you could use a ten sided die if you wanted) and their experiences will all vary so take these subjective numbers with a grain of salt. The comments in these reviews are far more enlightening than the numerical scores assigned. Also as mentioned, these shouldn't be your sole means of evaluating a lens you're considering purchasing.
09-23-2016, 02:52 AM   #8
Site Supporter
Site Supporter




Join Date: Mar 2009
Location: Gladys, Virginia
Photos: Gallery
Posts: 16,548
It is what the others said. Basically, if I am doing a review, I am trying to rate the lens in a number of different categories -- build, auto focus, sharpness and contrast, etc. The numbers come in because the site asks you to put a number on the performance in those areas too. So, a 10 would be the best performance -- say prime sharpness wide open, while a 1 would be horrible, unusable performance. Most modern lenses are in the upper end of that scale with decent performance stopped down a stop.

As Norm says, the actual reviews are probably more useful than the numbers/.

09-23-2016, 10:15 PM   #9
Forum Member




Join Date: May 2015
Posts: 58
Original Poster
QuoteOriginally posted by pepperberry farm Quote
any time that I am thinking about a lens, I read the lens reviews here, but I also look at flickr for a wide selection of shots by that lens...
Thank you! The link points to the helpful complete and detailed reviews.

---------- Post added 09-23-16 at 10:37 PM ----------

QuoteOriginally posted by Rondec Quote
It is what the others said. Basically, if I am doing a review, I am trying to rate the lens in a number of different categories -- build, auto focus, sharpness and contrast, etc. The numbers come in because the site asks you to put a number on the performance in those areas too. So, a 10 would be the best performance -- say prime sharpness wide open, while a 1 would be horrible, unusable performance. Most modern lenses are in the upper end of that scale with decent performance stopped down a stop.

As Norm says, the actual reviews are probably more useful than the numbers/.
I often use DXO lens reviews. They rate sharpness in the equivalent megapixels. In one case my good lens 55-300 on K-50 shows 6Mp equivalent and the 50-200 is about the same, however 50-200 is very poor lens. The posted on forum numbers sound as average values for a poor lens. I agree the detailed review would be a better place to understand the lens quality.
Tank you to ALL!
Leo

---------- Post added 09-23-16 at 10:39 PM ----------

I have got the idea. Switching to the Forum detailed reviews!
Thank you.
Leo
09-24-2016, 08:49 AM   #10
Pentaxian




Join Date: Nov 2013
Posts: 4,805
Most lenses here rate in the 8-9.5 range. People tend to be optimistic. So 6.3 is a VERY BAD rating on Pentax forum. if there more than a few reviewers, this likely mean the lens is far from being good.

But as other said, this is very subjective. People typically include price, their own bias/expectations so that a low end lens that get a 9 might actually be significantly worse than a premium lens that get a 8. Things like AF or sharpness evolve over time: more recent body give better performance but a 100% crop can look a bit softer... Different sample of the same lens may also get quite different results. It is not uncommon for a good sample of a 400$ prime to perform better than a bad sample of a 1400$ one (see lensrental findings on this) but the 1400$ one is less likely to have a bad sample too.

The best way is to look at several formal reviews (lenstip, photozone, DxO...), take a look a forums/user reviews and also very importantly, look at the sample image you can find on the net. Better if you can get full resolution pictures. That's very informative.

In the end, that the picture you get that matter and that's why you should not take a decision from formal reviews alone.
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!
autofocus, equivalent, forum, k-mount, lens, leo, pentax lens, performance, photos, pm, post, rate, review, reviews, scores, sharpness, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Decoding the Meaning of a Star Lens and Latest DFA Zooms dcpropilot Pentax SLR Lens Discussion 19 02-29-2016 02:15 AM
Question Lens specification table in lens reviews unreadable D1N0 Site Suggestions and Help 4 08-04-2015 12:10 PM
The Meaning in a Drawer Full of Old Family Snapshots Biro Photographic Industry and Professionals 3 11-18-2012 08:59 AM
How accurate do you think the average ratings in the Lens Reviews are? OutOfFocus Pentax SLR Lens Discussion 47 08-06-2011 07:18 PM
Meaning of ED, AL + IF in a lens ? lesmore49 Pentax SLR Lens Discussion 8 08-23-2010 06:43 PM



All times are GMT -7. The time now is 07:40 PM. | 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