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07-15-2018, 04:00 AM   #46
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QuoteOriginally posted by pres589 Quote
Sharky, I'm going to make an assumption, that you shot on 35mm film once upon a time, and can remember what different focal lengths on a film camera provided as far as a field of view. On your crop K-70, a 50mm like the DA 50 1.8 is basically a short-telephoto lens, and is great for portraits. Like a 75mm lens on film. 35mm lenses like the DA 35 f2.4 provides a field of view of just a touch narrower than what a 50mm lens did on film. . . .

QuoteOriginally posted by SharkyCA Quote
OK, I've read most of the threads and still need some advise!
I am a hobbyist, retired, I have a K-70 purchased last Sept. 2017 and have added a 55-300mm to complement my kit lens 18-135 but was thinking of something a little more "cityscape" or "architecture" oriented.

I am leaning toward the DA 35mm F2.4 AL or the DA 50 F1.8 right now there is a $20 spread between the two $96-$116.

Any input on this would be great!
perhaps this chart might be of some help

it allows you to compare " field of view " of lenses with various focal lengths based on the sensor of your camera

" Field-of-view (also known as FOV)
The values for Field of View (FOV) come up frequently enough at the forums that I thought a list might be helpful for quick reference.
Remember that focal length is stated for infinity and most lenses decrease in focal length as you focus closer.


Lens Focal Length FOV (Angles in degrees)
35mm & FX format (1) DX format (2) CX Nikon 1 format (3)

Horizontal Vertical Diagonal

10mm: 121.9 100.4 130.4, 99.0 75.9 109.2 , 66.8 47.5 76.8



(1) 36x24mm 35mm film frame/FX sensor size - Field of View Crop Factor = 1
(2) 23.6x15.7mm APS-C/DX sensor size - Crop factor = 1.5 [ Pentax ]
(3) 13.2x8.8mm Nikon1/CX sensor size - Crop factor = 2.8

https://www.nikonians.org/reviews/fov-tables


Last edited by aslyfox; 07-15-2018 at 04:05 AM.
07-15-2018, 04:29 AM   #47
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QuoteOriginally posted by Justin.APR Quote
I don't mind the manual focus but I do enjoy the on camera aperture settings
Just the thing for you... may I suggest you get your own "Street Lady" (Pentax-A 28mm F2.8), small, light and exactly the right focal length.
07-15-2018, 05:20 AM   #48
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there are many 28mm lenses one of which might tickle your fancy

as you can tell by glancing at this thread:

DSLR fun with 28mm: Club for any 28mm lens - PentaxForums.com





I like my Kino Precision Japan Kiron 28mm F2 MC P/KA

Last edited by aslyfox; 07-15-2018 at 05:47 AM.
07-15-2018, 05:39 AM   #49
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I used a 16-50 f2.8 as a walkaround lens on APS-C. It is the opposite of small, but I really like how it renders at 16mm. Thatís wide enough for a lot of architecture. Yet it can still do portraits at the other end with reasonable bokeh.

Pity about the size, though 🙂

-Eric

07-15-2018, 07:18 AM - 1 Like   #50
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The 16-50 certainly has upsides but I don't know that it's much more of a walk-around lens vs. the 18-135. 2mm greater width is nothing to sneeze at when it's in the teens, but...

A good used copy of the Pentax 12-24 or a Sigma 10-20 could be excellent additions to a kit that already has an 18-135 and 55-300 in it. There's also the old Tamron 10-24 although that lens seems less well-liked than the 12-24 or 10-20's. I really like my DA 15 for this kind of thing but I've been told it's Not Good For Architecture and I keep using anyway.
07-15-2018, 12:30 PM   #51
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QuoteOriginally posted by pres589 Quote
The 16-50 certainly has upsides but I don't know that it's much more of a walk-around lens vs. the 18-135. 2mm greater width is nothing to sneeze at when it's in the teens, but...
There's also the ~1 to2 extra stops that help with bokeh. Still, there's the shadow of SDM failure that makes folks apprehensive about the 16-50. It's my favorite walk around lens too, but my decade old copy had to go back for repairs twice in the first six months to get it right.

07-16-2018, 11:18 AM - 2 Likes   #52
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QuoteOriginally posted by rogerstg Quote
There's also the ~1 to2 extra stops that help with bokeh. Still, there's the shadow of SDM failure that makes folks apprehensive about the 16-50. It's my favorite walk around lens too, but my decade old copy had to go back for repairs twice in the first six months to get it right.
Of course, the 16-50 (unlike the 17-70) can be converted to screwdrive for free if you have an older body that can access its config file in Debug mode.

07-16-2018, 11:30 AM - 1 Like   #53
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QuoteOriginally posted by clackers Quote
Of course, the 16-50 (unlike the 17-70) can be converted to screwdrive for free if you have an older body that can access its config file in Debug mode.
But then you lose your stealth mode Ian!

07-16-2018, 04:35 PM - 1 Like   #54
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QuoteOriginally posted by SSGGeezer Quote
But then you lose your stealth mode Ian!
Yes, I'm used to it, but it can freakout Canikon shooters around me.
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