Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-29-2010, 10:57 PM   #1
Senior Member




Join Date: Jan 2010
Location: HCMC
Posts: 272
Sharpest lens in Pentax Mount

Dear All,

I am currently looking for the sharpest lens that can be mounted on a Pentax DSLR. There's no restrictions on what kind of lens as long as it is a DSLR pentax mount.

Prime or zoom, manual or auto focus, old or new, third party or genuine will do.

Admin if you could help me on the voting/counting.... would highly appreciate it.

Here's what i think for now since i don't have any sharp enough lens (for now).
(Currently own F 35-105mm, DA-L 18-55mm kit, M 50 f2)

1) Sigma 70 f2.8
2) Tamron 90mm f2.8
3) M 75-150 f4

If you can attached also sample pics from your lenses, would be great.

06-29-2010, 11:20 PM   #2
Pentaxian
twitch's Avatar

Join Date: Nov 2009
Posts: 4,571
Head over to photozone.de and look at the MTF charts for the lenses. You can then decide if you want centre sharpness or corner to corner, or which apertures you care about most.

My 2c is that all the limited primes, the DFA 100 macro, all DA* zooms or DA* primes are “sharp enough” for 99% of people. The Sigma 70 and Tamron 90 are often mentioned as well as incredibly sharp lenses.

A better approach I think is if you care about ultimate sharpness, just avoid the variable aperture consumer zooms.
06-29-2010, 11:44 PM   #3
Veteran Member




Join Date: Dec 2009
Location: Bucharest
Posts: 482
Peak sharpness award goes to FA 43mm Ltd http://farm4.static.flickr.com/3554/3360548249_ca7c5d128e_b.jpg - this picture actually sold me the FA 43
Even sharpness accross the frame and aperture award goes to DA* 70mm
All Macro lenses are very sharp

You just want to pick your choice about FL, macro capability yes or no and, of course, about money.

For me the best compromise would be the 35mm f2.8 Macro if you want to go wide-ish and the DFA 100mm or the DA 70mm for portraits/mid tele.

For tele sharpness, the DA* 200mm f2.8 seems to be the best but the DA 50-135 seems an excellent choice also (with the added flexibility of a zoom but shorter max FL)

From the non Pentax mount group I can swear on the Tamron 90mm and, from reviews, the Sigma primes, especially the 105mm Macro and the 50mm HSM (I actually had the 50mm but dold it due to the fact it was so large)

From the manual focus group there are a lot of choices but as a rule, everything with true macro (1:1) should be a very sharp lens. There are some legends of course, take your time and study the lens database here.

Last edited by kytra; 06-30-2010 at 12:13 AM.
06-29-2010, 11:48 PM   #4
Senior Member
summonbaka's Avatar

Join Date: Dec 2009
Location: Kagoshima, Japan
Photos: Gallery | Albums
Posts: 237
The DA40mm for starters. Any DA and/or FA limited primes will make you more than happy. The DA seem to be slightly sharper but the FA limiteds have a distinct rendering in them.

If you want macro, Tamron 90mm or Pentax 100mm are great.

It can help if you define what are you looking for. An "ultimate lens" is without meaning if you don't like the focal length(s) of it. Is it all-around? Portraits? Walk around? Macro? Normal?

06-30-2010, 12:19 AM   #5
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,585
I'll also put in a plug for the M 50mm 1.7, as well as the DA 40. Both very sharp once stopped down a tad, and nicely sharp across the image frame from edge to edge.

Note that 'sharpest' for even the best lens is a concept that may also only apply at a specific aperture and at a specific area or point across the lens image plane.

No lens in the world is going to be 'sharpest' at every aperture and at every point across the film plane. They will only ever be 'sharpest' within a specific range of parameters - eg f8, in the centre of the frame, like the FA 100 Macro reviewed here:

Pentax Lens: Primes - Pentax 100mm f/2.8 Macro SMC P-FA (Tested) - SLRgear.com!

A review site like slrgear for example lets you visualise the issues of sharpness very well.

This may mean the 'sharpest' lens out there in Pentax land may get an absolutely stellar lph resolution in the centre of the image, but sharpness may drop away at the edges of the frame, and the peak sharpness may only come at f8-f11.

Which means if you were looking for the sharpest lens for use in general low-light street photography or sports photography, the 'sharpest' lens out there may not be useful to you at all because at f2.8 of f4 it may be only an average performer.
06-30-2010, 12:46 AM   #6
Site Supporter
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 14,433
QuoteOriginally posted by HoBykoYan Quote
Dear All,

I am currently looking for the sharpest lens that can be mounted on a Pentax DSLR. There's no restrictions on what kind of lens as long as it is a DSLR pentax mount.

Prime or zoom, manual or auto focus, old or new, third party or genuine will do.

Admin if you could help me on the voting/counting.... would highly appreciate it.

Here's what i think for now since i don't have any sharp enough lens (for now).
(Currently own F 35-105mm, DA-L 18-55mm kit, M 50 f2)

1) Sigma 70 f2.8
2) Tamron 90mm f2.8
3) M 75-150 f4

If you can attached also sample pics from your lenses, would be great.
You are going to get 50 answers about 3 lenses :-)
06-30-2010, 01:01 AM   #7
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,535
"I'll also put in a plug for the M 50mm 1.7"

um, I must have a bad copy or something, but my 50mm f/1.7 gets its arse handed to it by the K 50mm f/1.2 at f/2.8 and up. The difference between the two is most apparent in the corners.
06-30-2010, 01:19 AM   #8
JHD
Veteran Member




Join Date: Jan 2010
Photos: Albums
Posts: 1,407
I have a number of Pentax and third party lenses, all of them currently available. Of the three you mentioned, I only have the Tamron 90; it's a nice lens but apart from macro duty, I really don't use it.

I've spent a lot of time looking at the Photozone MTF ratings and my take is for the best possible center sharpness at a reasonable price, the Sigma 30 1.4 has no equal. I have this lens and I wouldn't change it for the FA31. Sure it (the Sigma 30) isn't as sharp in the corners or the edges, but from what I can see it is considerably sharper than the FA31 in the center. In fact it is wicked sharp! I wish it was a little wider, but it is far more useful to me than my FA50, which unlike the Sigma 30 is very soft at F1.4. The other nice thing about the Sigma is images have a holographic 3 dimensional that rivals everything else I’ve seen, including my DA Limiteds.

My computer is mess but I'll look for something to post.

06-30-2010, 01:56 AM   #9
JHD
Veteran Member




Join Date: Jan 2010
Photos: Albums
Posts: 1,407


Uploaded with ImageShack.us

CLICK ON IMAGE TO SEE FULL SIZE
06-30-2010, 02:01 AM   #10
JHD
Veteran Member




Join Date: Jan 2010
Photos: Albums
Posts: 1,407


Uploaded with ImageShack.us

CLICK ON IMAGE TO SEE FULL SIZE
06-30-2010, 02:19 AM   #11
Veteran Member
fractal's Avatar

Join Date: Nov 2008
Location: Melbourne
Photos: Gallery
Posts: 3,549
QuoteOriginally posted by JHD Quote
I've spent a lot of time looking at the Photozone MTF ratings and my take is for the best possible center sharpness at a reasonable price, the Sigma 30 1.4 has no equal.
It doesn't get mentioned often on here, but I really can't wait to own this lens. I quite like the FOV and from the samples i've seen the IQ looks great & not to mention really sharp in the centre.
06-30-2010, 02:21 AM   #12
Veteran Member




Join Date: Jul 2009
Posts: 1,296
I think there are perhaps issues with the question. As others have said, there are far more - or just as important issues are 'sharpness' in a lens. For a start, there is focal length and maximum apertures. Then size, weight, bokeh, focusing distances, focusing speed, build quality, rendering across the frame, rendering in the centre, vignetting, reliability, tendency for flare, tendency for fringing, colour, contrast, barrel or pincushion distortion, autofocus or manual, price, zoom range if any... etc etc. And sharpness at what aperture?

So do you need something along the lines of a Super Takumar 50mm f/1.4 manual, or a Pentax 100mm WR macro, or a 300mm DA*...
06-30-2010, 02:28 AM   #13
Senior Member
feverbeaver's Avatar

Join Date: Aug 2008
Location: Langen, Germany
Photos: Gallery
Posts: 106
The sharpest lens is the Leica 100mm 2.8 APO-Macro with leitax-adapter.
http://slrlensreview.com/web/leica-slr-lenses-133/macro-slr-lenses-141/418-l...ns-review.html

From Pentax it is the F/FA 50mm 2.8 Macro
06-30-2010, 02:34 AM   #14
Pentaxian




Join Date: Dec 2007
Location: Prague
Photos: Gallery
Posts: 1,198
Don't forget macro 50/2.8!
The DFA 50/2.8 is my sharpest lens (and I do not own just few of them).
I believe it has an edge over FA43 as well - but it is a close cut.
06-30-2010, 02:48 AM   #15
Pentaxian
8540tomg's Avatar

Join Date: Feb 2008
Location: Waterloo, Ontario
Photos: Gallery
Posts: 4,444
It doesn't get a whole lot of love but the sharpest lens in my kit is the old Pentax M 50/4 macro. Uber sharp and well correct for flatness of field. The Pentax A 100/2.8 macro is a close second. These are just personal impressions based on years of use and not Photozone MTF figures.

Tom G

Last edited by 8540tomg; 06-30-2010 at 03:13 AM. Reason: typo
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!
dslr, f2.8, k-mount, lens, lens in pentax, mount, pentax, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sharpest Lens you own? Eagle_Friends Pentax SLR Lens Discussion 176 05-14-2010 05:37 AM
Which fast (better than F2) AF lens is sharpest at f1.7. pcarfan Pentax SLR Lens Discussion 4 10-01-2009 02:35 PM
Pentax 67 Sharpest Lens desertscape Pentax Medium Format 6 06-07-2009 05:58 AM



All times are GMT -7. The time now is 06:29 AM. | See also: NikonForums.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