[choong_dc]

So with all the HD lenses that is now being offered, does it mean that the MTF is higher?
And if placed on full frame camera, after cropping the picture would still produce sharp images?
Hmmmm.... in doubt, but need to check with you guys first before i jump into HD DA15mm...
with 49mm Lee filters are possible?
So much question, need to know or my investment in it are all wasted....

[OldNoob]

I'd be curious as to what these lenses would yield on film. Wondering if the focal plane is the same.

[jatrax]

So with all the HD lenses that is now being offered, does it mean that the MTF is higher?

No idea, and we likely won't until someone does a test.

And if placed on full frame camera, after cropping the picture would still produce sharp images?

AFAIK all of the HD lenses are for APS-C, so you would get vignetting to some degree, although some of the limiteds are reported to be able to cover the FF image circle. But to your question, since the optics AFAIK are the same as the SMC versions, just the coatings changing and the rounded blades, then there should be no difference in edge sharpness versus the SMC version. As to how they would work on a mythical FF camera? Who can tell until there is such a thing?

[jatrax]

Wondering if the focal plane is the same.

If you mean the registration distance then it has to be the same. It's still a K-mount lens so distance to focal plane remains the same.

[choong_dc]

On film?!!! I SALUTE you!!!
Let me check my current knowledge [might be wrong stuff kept in it]... Due to the HD DAs' being built for APSC crop sensors, would that cause heavy vignetting around your image with a 35mm [I might be ignorant about this-judgment be damned ]?

[Eulogy]

As far as the new coatings increasing MTF results? In theory? No. If the lighting is perfect, it should remain the same. In real life situations though, probably a better performer due to lower reflective properties.

The DA40 and DA70 Ltd lenses are FF compatible. The DA35 Macro is as well, to an extent. (Severe Vignetting @1:1 ratio, lessening by F8, but always being clearly there.)

[OldNoob]

i mean obviously there would be need of cropping, but it would be nice to drop in a roll of Fuji Reala 100 and test some of these HD lenses to see if they are truly flat, and don't have a Focal plane tilt, that some DSLRs compensate for.

[kenafein]

As far as the new coatings increasing MTF results? In theory? No. If the lighting is perfect, it should remain the same. In real life situations though, probably a better performer due to lower reflective properties.

The DA40 and DA70 Ltd lenses are FF compatible. The DA35 Macro is as well, to an extent. (Severe Vignetting @1:1 ratio, lessening by F8, but always being clearly there.)

The DA70 is only compatible at f5.6, still only a minor crop would be needed.

OP,

The DA15 certainly will vignette heavily. You can buy the Samyang 14mm/2.8 for a full frame lens, but mounting filters is an expensive, or custom, proposition.

[kenafein]

i mean obviously there would be need of cropping, but it would be nice to drop in a roll of Fuji Reala 100 and test some of these HD lenses to see if they are truly flat, and don't have a Focal plane tilt, that some DSLRs compensate for.

There is a thread on this forum with test shots from several Pentax lenses, on film.

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/31629-da-lens-...ts-thread.html

SMC Pentax-DA primes...
DA 14mm F2.8: - (clawhammer)
DA 15mm F4.0: - (Zav)
DA 21mm F3.2 Limited: - (Boris Liberman)
DA 35mm F2.4 AL: +++ (aurele ;like FA35/2.0 and no vignetting) (frank)
DA 35mm F2.8 Limited Macro: 0 (ryno), + (@ 1.15 crop)
DA 40mm F2.8 Limited: +
DA* 55mm F1.4 SDM: +++ (aurele)
DA 70mm F2.4 Limited: +
D FA Macro 100mm F2.8 WR: +++ (officially specified FF by Pentax)
DA* 200mm F2.8 ED [IF] SDM: +++? (common belief, but is it true?)
DA* 300mm F4 ED [IF] SDM: ++ (officially rated "designed for FF" by Pentax patent US7715116)
SMC Pentax-DA zooms...
DA 10-17mm F3.5-4.5 Fish-Eye ED [IF]: FE, see #59, #61, #94. 10mm: heavy vignette / 14mm: almost no vignette / 17mm ++ (Reps, froeschle, Gooshin)
DA 12-24mm F4 ED AL [IF]: - (below 16mm, xitek.com), o (at 18mm, architorture), + (at 20mm, architorture), ++ (at 24mm, architorture)
DA 16-45mm F4: - (below 21mm, Nesster)
DA* 16-50mm F2.8 ED AL [IF] SDM: - (xitek.com)
DA 17-70mm F4 AL [IF] SDM: - (KjetilH)
DA 18-55mm F3.5-5.6 AL: - (at 18mm, Spongefingers; below 23mm, xitek.com)
DA 18-55mm F3.5-5.6 AL II: missing
DA 18-250mm F3.5-6.3 ED AL [IF]: - (xitek.com)
DA 50-200mm ED: -
DA* 50-135mm F2.8 ED [IF] SDM: - (elho_cid)
DA* 60-250mm F4 ED [IF] SDM: ++ (officially rated "designed for FF" by Pentax patent US7489452) probably good on full frame but evaluation still missing; ++ is a temorary rating)
DA 55-300mm F4-5.8 ED: 0 (+, ++ at tele end, viking79)
Sigma K mount DC...
Sigma 18-200mm f/3.5-6.3 DC: -
Sigma 10-20mm f/4-5.6 DC: - (below 14mm, Gooshin)
...
Tamron K mount Di-II...
...
Overall rating scale:
+++: no significant difference between APS-C and FF corners
++: difference but usable at full aperture with a small loss in corner IQ only
+: usable staring at f/4~f/5.6, with no or a small loss in corner IQ only
o: usable at f/11 or with big loss in corner IQ only
-: not usable


Read more at: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/31629-da-lens-...#ixzz2igwg8lpo

[choong_dc]

Great!!!! Now to look for a 24mm f2.8 manual lens for landscape so that it'll fit a FF Pentax in future... finger all crossed!!!

[stevebrot]

Great!!!! Now to look for a 24mm f2.8 manual lens for landscape so that it'll fit a FF Pentax in future... finger all crossed!!!

Find yourself a Tamron 24/2.5 (01B, Adaptall-2) and you are set!


Steve

[lytrytyr]

Great!!!! Now to look for a 24mm f2.8 manual lens for landscape so that it'll fit a FF Pentax in future... finger all crossed!!!

I've been well satisfied with the K24/2.8.
It's not always quite as sharp at the edges as some third-party lenses,
but controls flare well, and renders nicely.

[Winder]

HD PENTAX-DA 15mm f/4 ED AL Limited Lens Review

This is the first review that I know of for the HD DA LTD glass.

[Digitalis]

after cropping the picture would still produce sharp images?

Let me get this straight..you are going to use a full frame camera with an APS-C lens and crop the image afterwards...you would save time by sticking with an APS-C camera then.

test some of these HD lenses to see if they are truly flat, and don't have a Focal plane tilt, that some DSLRs compensate for.

If a lens has a tilt in the imaging plane then it will perform poorly on film and digital, no camera can compensate for a de-centred lens. There are very few lenses with a perfectly flat focus field, nearly all of them are macro lenses and are very expensive.

with 49mm Lee filters are possible?

With the filter holder and a few Lee 100x150mm filters on the front of a tiny lens like the DA15 the appearance is rather comical - i'm speaking from experience here.

So with all the HD lenses that is now being offered, does it mean that the MTF is higher?

No. HD is just a re-branding of SMC coatings.

[choong_dc]

Well if it means by using the DA15mm on a future pentax FF DSLR which i would get a 24mmFL i'd be happy coz its HD...but now you said it was just rebranding of SMC coatings [I'm turned off]... my frustration and disappointment was further re-enforced when i tested the HD lenses from my friends K5 and made comparison to his non HD DA limited... no difference... Thinking of a 12-24 and an Fish Eye... also i does not look comical with a 77mm filter mount :P