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12-02-2012, 11:52 AM   #1
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Canon versus Pentax 35-105mm f/3.5 constant lenses?

Both of these lenses have been referred to as a “Stack of Primes.” Are there reasons to prefer one to the other? Would there be any reason to prefer either over a Rikenon 28-100mm f/4 constant lens?

I am looking for an inexpensive but relatively good quality all-around lens with manual focus for use on a Nex 5n.

If one is better than the other, how much more would you be willing to spend? For example, if the Pentax is better than the Ricoh, is it so much better that you would spend an extra $70 and sacrifice 7mm at the wide end?

If the Pentax and Canon are better than the Ricoh, which is better than the other?

One thing I would add is that I really like the parfocus of the Ricoh.

Thanks in advance.

12-02-2012, 02:13 PM   #2
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I can't offer experience with either, but in case you haven't seen them, here are user reviews on the SMC Pentax-A 35-105mm F3.5
12-02-2012, 02:31 PM   #3
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The A35-105 is supposed to be one of the older lenses that works well with DSLR sensors, because the rear element coating is improved over that of earlier lenses, thereby reducing reflections off the sensor that lower IQ.

Having said that, I have found that the contrast of images taken with my copy (purchased for a song during a visit to the US some years ago) needs a fair bit of PP to come up to scratch. I've also fitted a lens hood to help that along, especially when using a front filter. It is sharp, IMHO, but the contrast lets it down. In the right circumstances, it thoroughly deserves the reputation it has.

I can't speak for the Canon or Rikenon, as I have no experience with them.

Last edited by RobA_Oz; 12-03-2012 at 06:07 AM. Reason: Corrected reference to Canon
12-02-2012, 02:32 PM   #4
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There are also some more sample images from the SMC A 35-105 lens here:

https://www.pentaxforums.com/forums/lens-sample-photo-archive/153146-pentax-35-105mm-f3-5-a.html

12-02-2012, 04:18 PM   #5
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Not really related to the question, but I'm always wondering how 'macro' the Pentax is. Does it go to 1:4 or to 1:2?
12-02-2012, 04:36 PM - 1 Like   #6
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2.5 magnification, so 1:4
12-02-2012, 05:30 PM   #7
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So I just did a little googling to see what I could find out about that Ricoh 28-100. It supposedly has a lot of barrel distortion on the wide end according to Subjective Impressions of K-Mount Lenses (scroll about halfway down).

As for the Canon vs Pentax I'm not sure there's much to distinguish between them. They have similar dimensions aside from the Canon taking 72mm filters to the Pentax's 67mm. The Canon has a 5-blade aperture and the Pentax has 6 blades. Their "macro" range is also pretty similar.

Keep in mind that on an APS-C camera like the NEX, 35mm is a slightly-long normal focal length so you may find you need to go wider.
12-13-2012, 12:46 PM   #8
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Barrel distortion and pincushioning seem average to me

I am not having the same problems with barrel distortion and pincushioning thatthe subjective reviewer indicates. I wonder if this is because I am shooting with anAPC-C. There is some barrel distortion at 28mm and some pincushioning at 100mm. The atttached photos were taken at a distance of about 4 feet.

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12-13-2012, 08:57 PM   #9
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The distortion doesn't look too bad, and I'd say using it on APS-C may help in that regard. I'd be more concerned about the 28mm shot not being particularly sharp. Unless the focus is maybe just a bit off?

I you're happy with the Ricoh 28-100, I'd probably look into finding something wider to complement it, rather than replace it with the Pentax or Canon 35-105s. Like for example a Tokina 17/3.5.
12-14-2012, 08:01 AM   #10
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Focus is off

Thanks msatlas. The focus is off. When in focus, the lens is quite sharp.
12-14-2012, 09:04 AM   #11
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Putting the Pentax 35-105 on a Nex 5n totally defeats the purpose of the Sony because it's such a large, heavy lens. It even makes my K10D more of a handful...and that's saying something!
12-14-2012, 10:32 PM   #12
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I have a Pentax A 35-105 Macro zoom. I bought it new in '84...it was my main lens on my wife's K1000 from then to 2006. I've used it on my K10D +_ K-5...manual focus....photo's are excellent...whether on film or digital bodies.

Mine is built like a tank....and going on 30 years use in 2014. I still regard it as one of my best lenses....although the digital lenses with their automatic focusing are used more often by me, as I'm in my 60's and my eye's aren't as good when focusing manually anymore.
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