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06-06-2015, 06:43 AM   #16
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I do like the look of the 20-40mm... probably the zoom I covet the most... in general I prefer to avoid zooms though, in favour of primes for outright IQ and size

This image shows some of the differences in size, the 20-40 is perhaps bigger than the 31... I dont deem the 31 to be discrete, its not that heavy though

https://www.flickr.com/photos/hisway306/11251474064/

A stopped down 21 might perform better than the 20-40 ?

Unfortunately the fa 43mm is not in that pic

06-06-2015, 09:56 AM   #17
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QuoteOriginally posted by Conqueror Quote
Unfortunately the fa 43mm is not in that pic
The 43mm is very close to the 70 in size.
06-06-2015, 10:15 AM   #18
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The reason for buying a 21 ltd is, it has excellent control of CA for a lens that wide. And in my experience better control of CA leads to better micro-contrast. That is the one place where it clearly outperforms the zooms that cover it's focal length. 21mm is tough on a zoom. The resolution is less that top notch, but it's within 100 lw/ph of top notch, so it's no slouch either.

I really like the lens. For what ever zoom I have on the camera (18-55, 18-135, 18-250) I'll immediately take them off the camera if I'm shooting in the 20-2-22 mm range.

Last edited by normhead; 06-07-2015 at 05:44 AM.
06-06-2015, 01:00 PM   #19
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QuoteOriginally posted by Conqueror Quote
This image shows some of the differences in size, the 20-40 is perhaps bigger than the 31... I dont deem the 31 to be discrete, its not that heavy though https://www.flickr.com/photos/hisway306/11251474064/
A stopped down 21 might perform better than the 20-40 ?
The 20-40 & 31 are real close in size, but according to my scale, the 31 is 3oz heavier.

The 21 does seem to give a little better image, I like my 21 when it's needed, but I see them as different tools. If you're fine at 21mm, don't need to zoom up to 40mm without changing lens or need WR, then the 21 should be fine. It's what your needs are.

06-06-2015, 01:50 PM   #20
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QuoteOriginally posted by longbow Quote
The 20-40 & 31 are real close in size, but according to my scale, the 31 is 3oz heavier.

The 21 does seem to give a little better image, I like my 21 when it's needed, but I see them as different tools. If you're fine at 21mm, don't need to zoom up to 40mm without changing lens or need WR, then the 21 should be fine. It's what your needs are.
The 20-40mm ticks all the boxes... only hesitant about its size.

The 21mm is perhaps discrete enough for street.

I wonder if the 21 would perform better for astro too.
06-07-2015, 05:39 AM   #21
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No knock on the 20-40, but the main reason it hasn't interested me is the small size and high quality of the two primes. It is a fairly unique Pentax offering. People used to mistake my Kx with one of these lenses for a P&S.

---------- Post added 06-07-15 at 06:42 AM ----------

QuoteOriginally posted by longbow Quote
Ya, but a 20-40 is cheaper (new) than the other two combined, about the same weight and you don't have to carry the second lens in your pocket, plus you get WR with 20-40
True, but with the primes, the camera will fit in a coat pocket or waist pack. It depends upon which is more important to you.
06-07-2015, 05:46 AM - 1 Like   #22
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MY favourite "just in case I need them" combo is the 21 and 40XS, to go with my walk around zoom. They both fit easily in my pockets or packs. Now if someone could just make a macro like that.
06-07-2015, 06:00 AM   #23
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The DA21/40 Ltd were the first digital primes I bought 8 years ago, so I do have an attachment to them. They are even cooler on the newer, compact bodies than on the K10d.

06-07-2015, 11:31 AM   #24
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The dilemma is outright IQ and small size 21 and/or 40
vs
Flexibility and WR 20-40

-----------

Maybe the K-5iis + 21 is still a bit big for street work... need to have a think
06-07-2015, 11:37 AM   #25
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QuoteOriginally posted by Conqueror Quote
The dilemma is outright IQ and small size 21 and/or 40
vs
Flexibility and WR 20-40

-----------

Maybe the K-5iis + 21 is still a bit big for street work... need to have a think
If you don't have an 18-135, 16-85, 17-70 type lens to cover the range, I'd say go for the zoom. It might be all you need in that range.
06-07-2015, 11:51 AM   #26
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QuoteOriginally posted by normhead Quote
If you don't have an 18-135, 16-85, 17-70 type lens to cover the range, I'd say go for the zoom. It might be all you need in that range.
Yeah I weighed up the 18-135,16-85 and 16-50, 50-135 a while ago. I do crave the IQ of primes though and in general prefer to frame without using a zoom.

I saw a deal and went for the 50-135mm for many reasons:
-many claim it to be the best zoom in the system, and yeah its pretty incredible
-doubles well as an event portrait/people lens
-AW



less than 50 I can currently use the 15/16/31

~35 is my favourite focal length... so the 31 is glued to the camera


the 20-40 + 50-135 combo is appealing... I don't want to sideline the 31 though!
06-07-2015, 12:55 PM   #27
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Add a second body and a 21. Done. Now wasn't that easy?
06-07-2015, 05:16 PM   #28
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QuoteOriginally posted by GeneV Quote
True, but with the primes, the camera will fit in a coat pocket or waist pack. It depends upon which is more important to you.
Agreed !!

---------- Post added 06-07-15 at 05:41 PM ----------

QuoteOriginally posted by Conqueror Quote
the 20-40 + 50-135 combo is appealing...
It is a good combo, wished I'd brought my 50-135 today - wildlife everywhere. Only had the 16-85 instead, needed more reach.....stalking closer don't always work out well
06-07-2015, 06:07 PM   #29
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Don't post that in the 16-85 vs 18-135 thread. They'll dump doo doo on you. They don't need no stinking 135mm reach.
06-07-2015, 07:19 PM   #30
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QuoteOriginally posted by normhead Quote
Don't post that in the 16-85 vs 18-135 thread. They'll dump doo doo on you. They don't need no stinking 135mm reach.


hey, I like my 16-85, most days it more than enough, definitely a little puny today.....starting to feel I need 60-250
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