[i5_david]

Wow These shots Are really cool! Like the flares as an element of style here! Clever. I would not say that UwA are not for landscapes. I can down to 12mm in my k5 but I like to use it for stuff like this where you put the horizont near the upper edge and implement lots of stuff in the foreground.

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Last edited by i5_david; 04-29-2016 at 01:41 PM.

[i5_david]

I am on the fone right now and it seems that only one foto can be attached?!

[hadi]

when its released, this maybe a decent contender


in my eyes, this wins over the samyang due to the rear mount gel filter. if its a lens to be used for landscape, its gotta be able to use an ND filter

[i5_david]

If you get a good deal with the samyang you can buy almost 3 for one price of the irix (saw a price fall this January to 260€ or so, have missed his sale, btw). But we will see how this lens will work in the field. Maybe it's awesome and worth the money!

[Stratman]

Here is a comparison of crop vs. full frame with a 28mm lens, The "full frame" was my Ricoh KR 5 Super using Kodak BW400 film, and crop body was K110D. I'm thinking I can get by with 28MM until i can find a deal on something wider.

[Kerrowdown]

Best wide angle lens for K-1?

For me I'm really hoping it's going to be my “Mistress" (SMC Pentax-A 15mm F3.5) or "Good Lady” (SMC Pentax-A 20mm F2.8), just need to get my hands on the FF now.

How far away is mid April now?

[wtlwdwgn]

Here is a comparison of crop vs. full frame with a 28mm lens, The "full frame" was my Ricoh KR 5 Super using Kodak BW400 film, and crop body was K110D. I'm thinking I can get by with 28MM until i can find a deal on something wider.

I used a 28mm S-M-C Takumar on a D700 and it was marvelous.

[EssJayEff]

I wonder how my SMC Pentax-A 645 35mm would perform. Like a 21mm with a 0.62075x crop factor? Hadn't thought about that idea until I read this thread. I may be in the market for an adapter!

[Sandy Hancock]

I wonder how my SMC Pentax-A 645 35mm would perform.

I suspect it will behave like a slow 35mm lens, with excellent sharpness in the corners of the small format 135 frame.

[Digitalis]

I wonder how my SMC Pentax-A 645 35mm would perform. Like a 21mm with a 0.62075x crop factor?

Lenses don't work that way, on a full frame 35mm sensor it will be a 35mm lens.

[EssJayEff]

Lenses don't work that way, on a full frame 35mm sensor it will be a 35mm lens.

I realize that at 35 is a 35 is a 35 . . . I meant in terms of its angle of view.

---------- Post added 03-29-16 at 07:14 AM ----------

I suspect it will behave like a slow 35mm lens, with excellent sharpness in the corners of the small format 135 frame.

It's okay if it's slow . . . I'm rarely in a hurry. I often use camera movement and blurs in my photographs . . . or the opposite, a tripod.

[Sandy Hancock]

It's okay if it's slow . . . I'm rarely in a hurry. I often use camera movement and blurs in my photographs . . . or the opposite, a tripod.

Then I have no doubt you could put it to excellent use

[Wild Mark]

+++++ for FA20/2.8

but I suspect many will be happy with a 28mm lens when entertaining wide angle. A little less distortion and a great range of inexpensive options to choose from (e.g. K28/3.5).

[EssJayEff]

I realize that at 35 is a 35 is a 35 . . . I meant in terms of its angle of view.

---------- Post added 03-29-16 at 07:14 AM ----------

Now that it's no longer 6:00 in the morning, let me clarify my question. I've never worked with a "crop factor" that was less than 1.0. I understand that a full frame 35mm lens produces an image circle that is larger than an APS-C sensor, hence a crop factor larger than 1.0. I saw something (OK I'll blame Ken Rockwell's chart "645 Lens 35mm Equivalents") that says the crop factor for the 645 film format to 35mm sensor is 0.62075x, with an angle of view for a 645 35mm lens being equivalent to that of a 21mm on a full frame 35mm camera. This makes no sense to me. The 645 lens is creating an image circle that is larger than a 645 digital sensor, so naturally the image circle is also larger than a full frame 35mm sensor. So why wouldn't the crop factor still be larger than 1.0 when using a 645 lens on a 35mm full frame sensor? A crop factor less than 1.0 to me implies that the sensor is larger than the image circle. Why would a 645 35mm lens act like a 21mm on a camera with full-frame 35mm sensor? Where am I getting confused?

[clackers]

Why would a 645 35mm lens act like a 21mm on a camera with full-frame 35mm sensor? Where am I getting confused?

Well, it doesn't, SJF.

Focal length isn't a property of any sensor.

Don't listen to anyone who claims otherwise! ☺