Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-23-2018, 04:37 AM   #1
Site Supporter
Site Supporter
BruceBanner's Avatar

Join Date: Dec 2015
Location: Blue Mountains, NSW, Australia
Posts: 3,289
Event Shooting With An Irix 15mm (On APS-C No Less)?

I'm currently on the lookout for a new wide angle lens, for multiple reasons, and the Irix 15mm has come up as a sure contender. For those that know me should know by now that I have been shooting almost exclusively Manual Focus with my Samyang 85/1.4 (+Tenpa 1.22 to boot) as well as using other MF glass. I am basically getting better at it, but I have come to the following conclusion;

- On lenses with a longer focal length such as the 85/1.4, it is significantly easier to nail focus, either via the OVF (with some aid from the Tenpa) or LV
- On wider angle lenses, such as my SMC Pentax-A 24/2.8, nailing focus is harder, almost impossible unless stopping down or just going to infinity and getting enough distance between you and your subject (sometimes too much).

Now the 15mm Irix would I'm sure fall onto the latter, which leads me to believe it's the wrong choice. I would make plenty use of it in my landscape work, however I don't much like the idea of using Hyperfocal apertures to get a group shot in a low light venue. I would want to take full advantage of the sharpness it has at f2.4, but just how difficult is that going to be to nail focus...

On an KP the FoV would be more equivalent to a 23mm, so slightly narrower but still very acceptable, I'm wondering if it is actually in this regard easier?

I can totally see myself rocking an event with the K-1 paired with the Samyang 85/1.4, a KP with an Irix 15mm, rocking MF all the way, but then also using the Irix on the 15mm for those landscape shots at events and just landscape work in general.

But is this a terrible idea? I have full confidence in nailing portrait and couple shots with the 85/1.4, it's just when I run out of room to back up in that will demand the Irix 15mm (and the lighting is not so great so I wouldn't want any of that f8 stuff), how am I going to fare?

Irix fans/users, please chime in!

TIA!

Bruce

07-23-2018, 04:59 AM - 1 Like   #2
Pentaxian




Join Date: May 2016
Photos: Gallery
Posts: 1,352
You can get reasonable photos of groups of people at 15mm and I see wide angle shots in the news often enough. Just need to be extra careful at how you tilt the camera to control perspective distortion. But other than that I've done events (I think it was a poster session) with a 15mm on apsc, it was the Pentax limited.
edit: about using manual focus, do you need large prints from this? For smaller (newspaper and web size) you should be able to use zone focus, and of course actually focusing on the subject will be even better.

Last edited by aaacb; 07-23-2018 at 05:19 AM.
07-23-2018, 05:35 AM   #3
Site Supporter
Site Supporter
BruceBanner's Avatar

Join Date: Dec 2015
Location: Blue Mountains, NSW, Australia
Posts: 3,289
Original Poster
QuoteOriginally posted by aaacb Quote
You can get reasonable photos of groups of people at 15mm and I see wide angle shots in the news often enough. Just need to be extra careful at how you tilt the camera to control perspective distortion. But other than that I've done events (I think it was a poster session) with a 15mm on apsc, it was the Pentax limited.
edit: about using manual focus, do you need large prints from this? For smaller (newspaper and web size) you should be able to use zone focus, and of course actually focusing on the subject will be even better.
Yeah printing is definitely a possibility.

I know I like this lens, I've seen enough of it to want it anyway (eventually) for my fullframe. But right now I can't justify my funds for something purely landscape based unless it can also be used a fair bit with a high degree of success in events, and with my camera line up it would sit on a KP. I am curious to know if I could manage focus on shots shooting wide open with it, or if that is going to be extremeley difficult (because I find the SMC Pentax-A 24/2.8 very hard to nail focus on either camera... Landscape is different, tripod, LV, all the time in the world (and typically you're F8 or higher and therefore just throw into infinity focus...
07-23-2018, 01:59 PM - 2 Likes   #4
Pentaxian
mcgregni's Avatar

Join Date: Sep 2012
Location: Surrey, England
Posts: 2,586
I use the Samyang 14mm f2.8 on aps-c, and for shots with people then I don't even try at wider apertures than F6.7. I don't think you could nail eye focusing through the viewfinder, and Live View with magnification is fairly impractical and too slow for portraits. These challenges will be even more on Full Frame I feel.

So for low light wide aperture shooting I think any lens of this type is out, at least for professional work. If you're using flash and can shoot at F8 then it's more viable, otherwise I think an autofocus lens will be necessary for reliable well focussed people shots at ultra wide angles.

07-23-2018, 06:34 PM   #5
Site Supporter
Site Supporter
BruceBanner's Avatar

Join Date: Dec 2015
Location: Blue Mountains, NSW, Australia
Posts: 3,289
Original Poster
QuoteOriginally posted by mcgregni Quote
I use the Samyang 14mm f2.8 on aps-c, and for shots with people then I don't even try at wider apertures than F6.7. I don't think you could nail eye focusing through the viewfinder, and Live View with magnification is fairly impractical and too slow for portraits. These challenges will be even more on Full Frame I feel.

So for low light wide aperture shooting I think any lens of this type is out, at least for professional work. If you're using flash and can shoot at F8 then it's more viable, otherwise I think an autofocus lens will be necessary for reliable well focussed people shots at ultra wide angles.
I think you're right.
07-23-2018, 06:39 PM - 1 Like   #6
Site Supporter
Site Supporter
Sandy Hancock's Avatar

Join Date: Feb 2012
Location: Adelaide Hills, South Australia
Photos: Gallery | Albums
Posts: 7,601
For events, a DA*16-50 would make a lot more sense on the KP.
07-23-2018, 07:35 PM - 1 Like   #7
Site Supporter
Site Supporter
BruceBanner's Avatar

Join Date: Dec 2015
Location: Blue Mountains, NSW, Australia
Posts: 3,289
Original Poster
QuoteOriginally posted by Sandy Hancock Quote
For events, a DA*16-50 would make a lot more sense on the KP.
Definitely, or a Sigma 17-50, but then Sandy why would I ever choose the sensible logical option... this is me we're talking about after all
07-23-2018, 10:59 PM   #8
Site Supporter
Site Supporter
BruceBanner's Avatar

Join Date: Dec 2015
Location: Blue Mountains, NSW, Australia
Posts: 3,289
Original Poster
I decided to go with the following purchase decision, I just bought a silver HD DA 35mm/2.8 Macro, here's why;

- K-1 with have the Samyang 85/1.4 for those portrait shots.

- When more people add onto the shot and the 85 won't do (and no room to back up in) the KP with 35mm will come out.

- Because the 35mm is a macro, it will allow the sale of the DFA 100 Macro that I own (that doesn't see much action these days due to the arrival of the 85/1.4, thus I'm not adding lenses but rather replacing).

I shall have to continue the search for a UWA for the K-1 another day, but for now feel pretty content with this decision and pairing.

Thanks again!

NB: Even seems to work alright on the K-1! https://diglloyd.com/prem/s/DAP/PentaxK/lenses-35f2_8-aseries-map-lensHoodRe...ml?dglyPT=true

07-23-2018, 11:41 PM - 1 Like   #9
Site Supporter
Site Supporter
Sandy Hancock's Avatar

Join Date: Feb 2012
Location: Adelaide Hills, South Australia
Photos: Gallery | Albums
Posts: 7,601
QuoteOriginally posted by BruceBanner Quote
Why would I ever choose the sensible logical option... this is me we're talking about after all
Your decision certainly vindicates this statement
07-24-2018, 07:07 AM - 1 Like   #10
Veteran Member




Join Date: Sep 2017
Location: Medellํn
Posts: 632
Irix 15/2.4 on my K-5.
1 https://www.instagram.com/p/BcGFn1qFu8C/?utm_source=ig_share_sheet&igshid=137scrhitxdud
2 https://www.instagram.com/p/BcoYKv2FKLC/?utm_source=ig_share_sheet&igshid=puodqs1fdc91
3 https://www.instagram.com/p/BcGd3v2FrMb/?utm_source=ig_share_sheet&igshid=1be3pubkpr0id

On APS-C, it's more of a 20mm which is nice and very manageable. Unfortunately my 14/2.8 took a hit and I haven't been able to send it in for repairs.
Don't use hyperfocal setting. You will need full aperture if it's dark. I would recommend:
• Just estimate the distance and set it on the scale.
• Try measuring with a flexometer (tape measure), too. Maybe you like that technique.
• Another way is to have a flashlight for critical focus.
• Use live view magnification whenever the situation calls for it.
Cheers!
07-24-2018, 01:43 PM   #11
Site Supporter
Site Supporter
BruceBanner's Avatar

Join Date: Dec 2015
Location: Blue Mountains, NSW, Australia
Posts: 3,289
Original Poster
QuoteOriginally posted by torashi Quote
Irix 15/2.4 on my K-5.
1 ???? ???? (???? ????) on Instagram: ?Actitud explosiva @chelocanta en #wartmde?
2 ???? ???? (???? ????) on Instagram: ?@noise_feratu con @atipicaa en @wartmde #wartmde #rapiphero #noiseferatu #torashii?
3 ???? ???? (???? ????) on Instagram: ?#overalls son la pinta @wartmde #wartmde?

On APS-C, it's more of a 20mm which is nice and very manageable. Unfortunately my 14/2.8 took a hit and I haven't been able to send it in for repairs.
Don't use hyperfocal setting. You will need full aperture if it's dark. I would recommend:
• Just estimate the distance and set it on the scale.
• Try measuring with a flexometer (tape measure), too. Maybe you like that technique.
• Another way is to have a flashlight for critical focus.
• Use live view magnification whenever the situation calls for it.
Cheers!
Thanks for the reply
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
15mm, 15mm on aps-c, focus, idea, irix, irix 15mm, k-mount, kp, landscape, mf, pentax lens, shots, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ultra wide angle Irix 15mm or Irix 11mm matroxication Pentax K-1 67 09-19-2018 10:01 PM
Pentax IRIX Blackstone 15mm for the price of the FireFly on IRIX USA Site (475$) Weevil Pentax Price Watch 7 11-25-2017 03:51 PM
Irix 15mm for astro/night? Conqueror Pentax SLR Lens Discussion 8 04-17-2017 08:13 AM
Irix 15mm f/2.4 Lightroom Lens Correction Profile! kvetcha Pentax SLR Lens Discussion 6 03-18-2017 03:10 PM
New wide angle prime lens Laowa 12mm f2.8, or Irix 15mm f4 for K-1? David L Pentax SLR Lens Discussion 11 08-03-2016 07:10 PM



All times are GMT -7. The time now is 04:16 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top