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07-03-2015, 12:35 AM   #1
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How will the smc legacy perform under FF

The biggest question on my mind about FF, putting aside the sensor size etc, is how will our lenses perform. Some of us have the old classic manual smc's and FA's and the new DA range. I personally am hopeful that my FA 35mm F2 will kick goals on the FF and I hope my 50 A 1.7 will shine too, but I am somehow curious to know what will happen to my DA line up. I have my gem, the 16-50 DA* that I don't want to depart with, but will it be worth using any more knowing that my images will be drastically cropped and megapixels significantly cut in half? On the positive note I have seen some test in ff 35mm with the 55-300 and it seems to shoot with min vignetting after 200mm which is great!!!

07-03-2015, 12:49 AM   #2
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there is people using pentax glass on FF like the sonys or the canons
07-03-2015, 12:50 AM   #3
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Plenty of people using SMC legacy on FF.. just search sony a7, a7r, a7s, a7II, a7rII or Canon DSLR with M42.. I personally is the one use SONY A7 on all my Pentax lenses. Here is the Album on A7. Sorry! sometimes I also put contax and leica lens in this album.
07-03-2015, 01:54 AM   #4
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DA performance under FF

QuoteOriginally posted by Mattox Quote
The biggest question on my mind about FF, putting aside the sensor size etc, is how will our lenses perform. Some of us have the old classic manual smc's and FA's and the new DA range. I personally am hopeful that my FA 35mm F2 will kick goals on the FF and I hope my 50 A 1.7 will shine too, but I am somehow curious to know what will happen to my DA line up. I have my gem, the 16-50 DA* that I don't want to depart with, but will it be worth using any more knowing that my images will be drastically cropped and megapixels significantly cut in half? On the positive note I have seen some test in ff 35mm with the 55-300 and it seems to shoot with min vignetting after 200mm which is great!!!
You are specifically asking about DA-series lenses on FF, right? (Obviously, FF lenses will work with an FF sensor just fine.) I've heard the DA40 (NOT XS), DA*55, DA200, and DA300 are all full-frame designs, so they should work with a minimum of problems. I've heard the DA15, DA21, and most DA zooms are NOT FF-compatible. If someone else has specifics about other lenses, or corrections for the ones I've listed, I'm all eyes.

07-03-2015, 02:19 AM   #5
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QuoteOriginally posted by fredralphfred Quote
You are specifically asking about DA-series lenses on FF, right? (Obviously, FF lenses will work with an FF sensor just fine.) I've heard the DA40 (NOT XS), DA*55, DA200, and DA300 are all full-frame designs, so they should work with a minimum of problems. I've heard the DA15, DA21, and most DA zooms are NOT FF-compatible. If someone else has specifics about other lenses, or corrections for the ones I've listed, I'm all eyes.
You just won't be able to capture the entire frame. But it's doable if you are willing to crop. I use DA21 on A7 all the time. no problem at all.

This is 21mm on A7 cropped around 25mm

Last edited by photodesignch; 07-03-2015 at 02:27 AM.
07-03-2015, 02:25 AM   #6
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These two threads really should be stickied in this area of the forum

Current K-mount Full-Frame Lenses

DA lenses on Full Frame: Test Shots thread

and this:

Pentax Lens Review Database Custom View - Full-frame lenses

Last edited by rawr; 07-03-2015 at 02:31 AM.
07-03-2015, 05:43 AM   #7
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There are lots of samples here :
https://www.pentaxforums.com/forums/122-lens-clubs/247282-pentax-lenses-ff-club.html




Generally speaking, most of the lenses will work well on FF.
24mm and wider may have off center sharpness issues (depending on lens and depending on sensor stack thickness too)

DA lenses.
16-50; 50-135 both vignette on the wide end.
DA15, vignettes a lot (basically just an aps-c crop)
DA40XS, surprisingly good enough (only poorer IQ at the edges and ok by f8) (I too have heard that the 40ltd is better, though I have never verified it)


Add the smallish size of most Pentax lenses to the equation, I do think they are some of the best lenses out there.
07-03-2015, 05:50 AM   #8
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So its mainly wide angle we have the issue with herez . Let's hope that there are some decent wide angles coming out for Pentax, and let's hope the prices are descrete

07-03-2015, 06:02 AM   #9
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QuoteOriginally posted by Mattox Quote
So its mainly wide angle we have the issue with herez . Let's hope that there are some decent wide angles coming out for Pentax, and let's hope the prices are descrete
There is supposed to be a fast aperture uwa zoom the roadmap.

The Samyang 14 is very good in most cases too.
And there is also the Sigma 12-24
07-03-2015, 08:33 AM   #10
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Legacy lenses designed for 35mm film will perform similarly on FF digital. They will not become "worse" and may even provide somewhat better results (at least for color work) than is available on film.* As for things like purple fringing (PF)...conventional wisdom is that legacy glass is more prone. This has not been my experience in that most of my legacy lenses have little of no tendency to PF. Both of my DA lenses will sometimes show PF. Go figure.


Steve

* The bar is set somewhat higher in this digital era due to the ease of pixel peeping. What was acceptably sharp on a projected slide or 8x10 print is now considered fatally soft.
07-03-2015, 08:37 AM   #11
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QuoteOriginally posted by Mattox Quote
I personally am hopeful that my FA 35mm F2 will kick goals on the FF and I hope my 50 A 1.7 will shine too
I use both on 35mm B&W film and both have excellent performance...as good as any lenses at those focal lengths. Don't worry. As for your DA* zoom


Steve
07-03-2015, 01:16 PM   #12
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QuoteOriginally posted by photodesignch Quote
You just won't be able to capture the entire frame. But it's doable if you are willing to crop. I use DA21 on A7 all the time. no problem at all.

This is 21mm on A7 cropped around 25mm
All right. I made the fatal assumption that one would not purchase an FF sensor camera merely to crop the vignetting off of the edges of their photos, leaving a (much cheaper) APS-C image circle. However, ALL the Pentax lenses should function, even if your photos look like a "telescope view" on television. I am delighted to discover the 40XS works well on FF, though. I'd heard they got the "XS" by cutting the "acceptable" image circle down from the 40ltd.
07-03-2015, 01:41 PM   #13
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QuoteOriginally posted by Mattox Quote
but will it be worth using any more knowing that my images will be drastically cropped and megapixels significantly cut in half?
That is still quite a few megapickles assuming a 36Mpx sensor, maybe even more than on your current camera. That being said, there is a very good case for keeping your APS-C body if you have any number of DA-series lenses.


Steve
07-03-2015, 08:25 PM   #14
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QuoteOriginally posted by Mattox Quote
I have my gem, the 16-50 DA* that I don't want to depart with, but will it be worth using any more knowing that my images will be drastically cropped and megapixels significantly cut in half?

It can still be worth using some of the DA lenses (depending on which)

The DA40XS for example is easily ok with a 5x7 crop ratio even wide open.

The DA15ltd, though only filling the aps-c image circle is such a gem of a lens with its size, beautiful starburst and flare resistance that its easily worth using.

There are megapixels aplenty on the new FF for sure (36mp or 42mp) and thats easily at the least as much mp as if the lens was shot from a K5IIs.


In fact, I shot most of a wedding on the Sony A7 with a Sigma 30/2.8 (aps-c lens) and these were usable in a 5x7 crop ratio to give close to a 35mm FL FOV.
The files were certainly large enough for prints and such.
07-08-2015, 02:03 PM   #15
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Classic manual smc lenses that are excellent on the a7r:
M 20 f4
K 28 f3.5
K 35 f3.5
M 35 f2.8
M 50 f1.7
K 55 f1.8
M 85 f1.8
M 100 f4 macro
M 135 f3.5
M 35-70 f2.8-3.5
A 24-50 f4

The stellar performers are the 28 and 85.
My travel combo is the 20, 28 and 35-70.

The 35-70 works really well on the a7r and is very cheap.
The 24-50 is the only 24 that I have found to be sharp at the edges and corners (unlike the k24 f3.5 and m24-35).

Hope this is of some help.
For those intending to buy the Pentax ff, you will have great fun using the old lenses and will be amazed at the image quality and you could save yourself a small fortune!!!!

---------- Post added 07-08-15 at 10:27 PM ----------

Sorry for a typo!!
Should be the k85 f1.8.
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