APC wide angle: I love my Sigma EX 10-20mm f4-5.6. Probably have taken more memorable images on that, than any other lens. It is full frame down to about 15mm (with little vignetting) so I think it matches the widest rectaliner full frame film lens that Pentax ever made.
Darren Addy Kearney, NE On Mon, Mar 27, 2017 at 3:20 PM, Stanley Halpin <s...@stans-photography.info> wrote: > OK, wide angles. I remember back almost 20 years ago when I first bought a > FA*24/2.0 and took it out for a test drive. First look through the viewfinder > and I was blown away. At some point I bought an A-20/2.8 and wow. > > Once I got into the wonderful world of 1.5x digital, my early lenses were > 16-45, 50-135. So, 24-70ish, 70-200ish.I went out for a day’s shooting with > my brother, borrowed his DA12-24 [18-35ish] and liked that. Eventually got > one of my own, and the DA14, and the DA15 though not all at the same time. > (Some of these were still on my shelf when I was planning Alaska, but I > didn’t chart them as I never had any intention of taking my wider APS-C > lenses as they gave me little if any advantage over the 24-70 I knew I would > take for the K-1. The 20-40 for the K-3 was a compromise, smaller and lighter > than a 16-50 and thus more likely to be used by my wife.) In sum, my prior > experience on film cameras went no wider than 20mm and with APS-C had been no > wider than a 14mm (21mm FOV equivalence). So, moving to a 15mm lens on the > full frame is quite a move for me. > > On my Alaska trip I could have taken advantage of a wider lens a few times > (widest I took was the D FA24-70) but I got by with 2-3 shot panos, some > handheld, some from a tripod. Actually I did have the A-20mm in my bag but > seldom used it. Easier to do the panos and work on them later than it would > have been to switch lenses. > > One of the things that my FOV chart made apparent to me was how much I could > extend my range on the wide end by adding the D FA15-30 or something in that > class. And I am thinking ahead to time in the narrow alleys and canals of > Venice later this year... > > In general I much prefer to stick with Pentax items. particularly modern > lenses with good autofocus and weather sealing. I was tempted by the new IRIX > lenses, their 15mm is out there, their 11mm is out or will be very soon. > Weather sealed, check, but not AF. When I saw a good deal on a LNIB D FA15-30 > from KEH, on the day they were doing a 10% price reduction on all stock, I > made the plunge. I have now had the D FA15-30 for a while. I am quite liking > that lens and appreciate the wide end. If Pentax sold a wider (rectilinear) > lens, I probably would not be interested. > > To your points, if I went off-brand and gave up weather sealing and AF yes I > could find something equivalent for an APS-C body. So many tradeoffs in all > of this, and at the end of the day I have only minor regrets in choosing the > K-1 over APS-C. And that regret is that my favorite shoulder bag is no longer > adequate. > > stan > >> On Mar 27, 2017, at 2:17 PM, P. J. Alling <webstertwenty...@gmail.com> wrote: >> >> Part of the lack of real wide angle with APS-C is a matter of the lenses you >> had. Judging from spreadsheet the widest was the DA 20-40. >> >> Now I'd prefer all Pentax lenses, but there are ultra wide angle lenses for >> APS-C from other manufactures. The Samyang 10mm f2.8 is ultrawide by any >> standard, sure it's manual focus but at 10mm DOF pretty much takes care of >> focusing even wide open, and there's the Sigma 10-20mm f3.5 or the older >> version that's f4.0~5.6. All three have the reputation of being fine >> lenses. Then there's the venerable Pentax 12-24. Which isn't really >> ultrawide. It's not a huge selection, but there are pretty good options. >> >> Now there are lots of reasons to prefer a K-1 the larger viewfinder is >> reason in itself, but I don't think there there's lens wider than 14mm for K >> mount that covers FF, and I'm pretty sure that the selection is just about >> as limited as for APS-C. You've got the Pentax branded Tamron design 15-30, >> a Sigma or two in that range, the old A 15mm f3.5, the Samyang 14mm there >> may be others but I can't think of them off the top of my head. They're >> not all that thick on the ground. >> >> >> On 3/27/2017 10:35 AM, Stanley Halpin wrote: >>> Looking for something totally else, I came across this spreadsheet on my >>> hard drive: a spreadsheet comparing the field of view of various lenses on >>> each of these 3 Pentax systems: K-1, APS-C, and 645Z. No new information, >>> nothing that most of us don’t already know about how various lenses behave >>> in combination with various sensors, but I found it useful to lay it out >>> this way to be able to visually compare. >>> >>> Dropbox link here to a pdf of the single page spreadsheet: >>> https://www.dropbox.com/s/qn2tzf43nh77n1q/Lens%20FOV%20Comparison.pdf?dl=0 >>> >>> Background: Last summer I spent a lot of time and effort in preparation for >>> a trip to Alaska. I have traveled to many places, I travel often, but the >>> Alaska trip was still a big big thing for me. I knew I would be putting >>> myself in position to capture some memorable photos. No guarantees that the >>> weather would cooperate, that luggage wouldn’t get lost, that travel >>> wouldn’t be disrupted, etc. But I wanted to do what I could ahead of time >>> to make be sure that I had the best possible photo gear to be able to take >>> advantage of whatever photo opportunities might present themselves. So part >>> of my planning and preparation was to think through the sort of scenes I >>> might have, and to previsualize THE shots I would take. >>> >>> At the time, summer of 2016, I had three camera systems: K-3 APS-C, K-1 >>> full frame, and 645Z. Plus a variety of lenses for each system. There was >>> no way I was going to travel with everything, (and there was no way that >>> everything I did take to Alaska would be with me on every field trip I >>> might take) and so I spent quite a bit of time thinking about which camera >>> body/lens combination would work best for various expected situations. As >>> part of that process I found some resources on the web which calculated the >>> effective field of view for lenses of a given focal length paired with >>> various sensor sizes. From those resources I pulled information about >>> lenses I had or might conceivably acquire and created the linked >>> spreadsheet. Note that the Field of View in degrees (FOV°) as often used >>> will typically refer to the diagonal dimension of the sensor - I chose >>> instead to look at the horizontal FOV° because that was more meaningful for >>> me as I tried to visualize various scenes. >>> >>> In the end I took all three systems with a subset of the lenses. I >>> convinced my wife to use the K-3 as her primary camera in lieu of her Leica >>> P&S she usually uses. So, one less for me to carry, but available as a >>> backup if needed. I used the K-1 as my primary, with the 645Z along mostly >>> for a few selected landscape shots. >>> I have since sold all of my APS-C gear and most of the 645Z system (still >>> have one lens to sell). I think the linked spreadsheet nicely illustrates >>> the major advantage of the full frame vs the other two systems: >>> availability of lenses. Neither 645 nor APS-C provides the option of >>> significant wide angle. Yes, I will grant that the 1.5x crop-factor on the >>> APS-C is nice when trying to capture wildlife a few hundred yards away, but >>> the DA*400/5.6 on my K-1, with images cropped in post processing, helped to >>> full that niche. And I will grant that the size and weight of the K-1 vs. >>> K-3 and other APS-C options can weigh heavily (pun intended) in favor of >>> the smaller lighter system. But for me I will put up with the weight and >>> bulk in order to be able to obtain a better selection of lenses within the >>> FOV range that I prefer to shoot. >>> >>> stan >>> > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- “The Earth is Art, The Photographer is only a Witness ” ― Yann Arthus-Bertrand, Earth from Above -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
