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04-13-2010, 04:05 AM   #1
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M 28mm vs K 35mm

I am looking for a fast (F2.0) Pentax manual focus lens in the 28-35mm range.
I have out-ruled the K 28mm f2 due to size.

I would like to know if anyone has or has had both the K 35mm F2 and M 28mm F2. I am interested to know how they compare.

Thanks.

Kind regards
.lars

04-13-2010, 11:00 AM   #2
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I have only the K 35 2.0 and the FA 31.
The FA 31 is better wide open, the K 35 is a little bit soft at 2.0. At 2.8 and 4.0 the K is very good (equal to the K 35mm 3.5).

I also have the s-m-c Takumar 35mm 3.5, the M 28 3.5 and the K 28 3.5.
All three are very good wide open. The K 28 is big but the best.

The build quality of the K 35 2.0 is the best. In my opinion better than the FA 31 .
04-13-2010, 11:21 AM   #3
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QuoteOriginally posted by feverbeaver Quote
I have only the K 35 2.0 and the FA 31.
The FA 31 is better wide open, the K 35 is a little bit soft at 2.0. At 2.8 and 4.0 the K is very good (equal to the K 35mm 3.5).

I also have the s-m-c Takumar 35mm 3.5, the M 28 3.5 and the K 28 3.5.
All three are very good wide open. The K 28 is big but the best.

The build quality of the K 35 2.0 is the best. In my opinion better than the FA 31 .
Thanks!
I have the K28/3.5 and K35/3.5 and they're both excellent.

It's very promising that the K35/2 equals its brother at F4.0. However, I would love to see a pic at F2.8. According to resolution tests the K35/2 at F2.8 is equal to the K35/3.5 at F3.5.....but those resolution tests should be taken with a grain of salt.

Kind regards
.lars
04-13-2010, 06:44 PM   #4
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it seems to be that way lars. but mind you that you gained about 1 and a half stop advantage with the 35/f2 as compared to the 35/3.5. the 35/3.5 however is a great lens but could be equal with the 35/2 both at the same aperture speed. there are reports that the AF version of the lens is sharper at f2 than it's earlier predecessor, so you might want to think of that as well.

as far as the K28/2 goes, boy I was looking for that lens for a long time without any luck and it is suprising that you don't want it even if you have the chance to buy one, just because of it's size. but anyway, I guess size meets your needs. p.s. send me a pm, if your able to get one for me for an acceptable price. thanks.

btw, I have a K28/3.5 and it has a monster of a resolution which is equal to the of the 35/3.5, basing from the photos.

04-14-2010, 01:14 AM   #5
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QuoteOriginally posted by Pentaxor Quote
it seems to be that way lars. but mind you that you gained about 1 and a half stop advantage with the 35/f2 as compared to the 35/3.5. the 35/3.5 however is a great lens but could be equal with the 35/2 both at the same aperture speed. there are reports that the AF version of the lens is sharper at f2 than it's earlier predecessor, so you might want to think of that as well.

as far as the K28/2 goes, boy I was looking for that lens for a long time without any luck and it is suprising that you don't want it even if you have the chance to buy one, just because of it's size. but anyway, I guess size meets your needs. p.s. send me a pm, if your able to get one for me for an acceptable price. thanks.

btw, I have a K28/3.5 and it has a monster of a resolution which is equal to the of the 35/3.5, basing from the photos.

I think the K35/3.5 is known to be sharper than the K35/2.0 between F5.6-F11 and if what I have read is correct it's also more contrasty. When comparing my K35/3.5 to my K28/3.5 I find the K35 sharper, but they equal out at F6.7. This actually corresponds to resolution tests (wow, this is one of the few moments where resolution tests matches real life experience)

Regarding the K 28/2, if I find one for a really good price I will of course buy it or give you a hint.

Kind regards
.lars
04-14-2010, 01:31 AM   #6
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QuoteOriginally posted by Recercare Quote
I think the K35/3.5 is known to be sharper than the K35/2.0 between F5.6-F11 and if what I have read is correct it's also more contrasty. When comparing my K35/3.5 to my K28/3.5 I find the K35 sharper, but they equal out at F6.7. This actually corresponds to resolution tests (wow, this is one of the few moments where resolution tests matches real life experience)

Regarding the K 28/2, if I find one for a really good price I will of course buy it or give you a hint.

Kind regards
.lars
thanks lars. I haven't really considered that resolution comparison since I haven't compared both the FA35 with the K28/3.5, except knowing that both lenses are sharp. but if I'm going to based my findings on my preference with the IQ rendering of both lenses without the same head to head direct comparison but by real world results, I would say that the 35 is indeed sharper. although I would prefer the bokeh on the K28/3.5. the 35's bokeh is pretty solid and resolution razor sharp . anyway, it seems that some of the later versions of some lenses are better than their predecessors, while some are better than their successors.
04-14-2010, 08:09 AM - 1 Like   #7
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QuoteOriginally posted by Pentaxor Quote
thanks lars. I haven't really considered that resolution comparison since I haven't compared both the FA35 with the K28/3.5, except knowing that both lenses are sharp. but if I'm going to based my findings on my preference with the IQ rendering of both lenses without the same head to head direct comparison but by real world results, I would say that the 35 is indeed sharper. although I would prefer the bokeh on the K28/3.5. the 35's bokeh is pretty solid and resolution razor sharp . anyway, it seems that some of the later versions of some lenses are better than their predecessors, while some are better than their successors.
Perhaps it's unnecessary to compare sharpness between these lenses. I mean, they are all sharp enough anyway. I try to avoid getting obsessed with resolution numbers but sometimes I can't help it.

Bokeh is more important for faster lenses IMO. I find the bokeh on both K35/3.5 and K28/3.5 good enough. I have heard that the K35/2.0 is better and when testing the M28/2.0 a few weeks ago I was very impressed with its bokeh.

Kind regards
.lars
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