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Forum: General Photography 09-07-2017, 12:54 AM  
Panoramic Picture Gear
Posted By HawaiianOnline
Replies: 9
Views: 563
Ole made up a handy FOV table for various focal lengths and sensor sizes a while back. You can probably use his to make a cheat sheet...

Field of View Tables, APS-C, 24x36, 645D, 645, 6x7 - PentaxForums.com
Forum: Pentax News and Rumors 03-28-2017, 12:14 AM  
"TTL Without Boundaries"
Posted By HawaiianOnline
Replies: 25
Views: 2,769
So does this mean that you can use a Pentax body with a Canon or Nikon flash???
Forum: Pentax News and Rumors 02-19-2017, 04:55 PM  
CP+ 2017 Pentax Interview Questions
Posted By HawaiianOnline
Replies: 215
Views: 13,317
Any plans to reintroduce the 600 f4??
Forum: Troubleshooting and Beginner Help 09-13-2016, 11:22 PM  
Infrared beginner has questions
Posted By HawaiianOnline
Replies: 11
Views: 979
Using an IR filter on a non-converted camera will have an impact in terms of usability. Non-converted cameras have an IR blocking filter (hot mirror) usually installed in front of the sensor. Placing an IR filter in front of the lens only lets IR light through which is then mostly blocked by the hot mirror installed in the camera. Its sort of like placing a strong ND filter on a non-converted camera then trying to take a visible light photo. The net effect is that you will need longer exposure times for the given ISO and f-stop setting than you would with a converted or normal camera.

A clear converted camera replaces the hot mirror with a clear filter which can pass through all the light visible to most digital camera sensors (some UV, visible, & IR). Some folks go with this option and purchase a variety of different screw in filters (UV only pass, visible only pass, visible + UV pass, visible + IR pass, various different IR filters, etc.) in order to get different effects. The advantage of this is that your camera will not need long exposure times for the same ISO and f-stop settings.The disadvantage is that you will not be able to see anything with any filters that block visible light if you are using an SLR with a traditional viewfinder. This makes it harder to focus since you will probably need to compose, focus, then install your filter without disturbing the camera. This isn't so much of an issue if you use liveview to focus and compose. The other disadvantage is that you may need to get different sizes of the filters you like to fit different lenses. You could also get oversized filters that fit your largest lens, then use stepping rings to fit those filters on your smaller lenses. These filters are not cheap...

A fully IR converted camera replaces the hot mirror with a dedicated IR (or UV) filter will not have the same flexibility as a camera converted with a clear filter. You will only have the use of a single filter, basically whatever was installed by the tech. This is not an issue if you like the look of particular filter (UV, 590nm IR, 720nm IR, 830nm IR, etc.).

Here are some samples from an 830nm IR converted Pentax K10D. Good luck with your conversion!


The Palace of Fine Arts
The Marina District, San Francisco, California
Focal Length: 18 mm
Exposure Time: 1/250 sec
Aperture: f/11
ISO Equivalent: 400



Maipalaoa Beach Park
Maili, Waianae Coast, Oahu, Hawaii
Focal Length: 15 mm
Exposure Time: 1/180 sec
Aperture: f/11
ISO Equivalent: 400



Haleakala Rising from the Sea
Flying back from Kona, Big Island of Hawaii
Focal Length: 26 mm
Exposure Time: 1/60 sec
Aperture: f/9.5
ISO Equivalent 400


Pupukea Beach
North Shore, Oahu, Hawaii
Focal Length: 18 mm
Exposure Time: 1/180 sec
Aperture: f/11
ISO Equivalent: 400

Here is a link to my full gallery...
Forum: Pentax SLR Lens Discussion 03-18-2016, 09:36 PM  
Looking for opinions on the Pentax HD DA 560mm vs the Sigma 500mm f4.5
Posted By HawaiianOnline
Replies: 30
Views: 2,578
Thank you all for your responses. Just to clarify, the primary uses of this lens will be for wildlife (mainly birding) and surf photography. Also, I already shoot with a Sigma 300mm f2.8 with the Pentax-F 1.7X AFTC. It's a good combination, but I'm looking for a bit more. Also, I'm not too concerned with weather sealing since I have lots of experience using a "Storm Jacket" cover with the 300mm. I'm just trying to feel out which of the two lenses I'd want to get to hit 500mm or 560 mm natively. I'd love a modernized 600f4 or even a Sigmonster in K mount, but who knows if such a thing is ever coming out...

EDIT: Here are some photos I've taken with the Sigma 300mm & the Pentax-f 1.7



Forum: Pentax SLR Lens Discussion 03-15-2016, 02:31 PM  
Looking for opinions on the Pentax HD DA 560mm vs the Sigma 500mm f4.5
Posted By HawaiianOnline
Replies: 30
Views: 2,578
Hello Everyone! I am looking for the opinions of people who have used or, better yet, owned both of these lenses, pure & simple. Just wondering how the two really compare in terms of sharpness, especially wide open or stopped down 1/2 to 1 stop. Thank you!
Forum: Mini-Challenges, Games, and Photo Stories 02-27-2016, 11:33 PM  
Thematic Beach & Surf
Posted By HawaiianOnline
Replies: 186
Views: 19,122
Waimea Bay, Oahu, Hawaii

The Bay called the Day and Eddie went on February 25, 2016 in what is being called the biggest Eddie ever with 60' (18.28 meter) waves at times. Here are a few photos from that day.

_____________________________________












The rest are here...

All images taken with a Pentax K-5IIs with a Sigma 300mm f2.8 APO DG lens and a 1.7X TC
Forum: Mini-Challenges, Games, and Photo Stories 12-13-2015, 02:07 AM  
Thematic Beach & Surf
Posted By HawaiianOnline
Replies: 186
Views: 19,122
A few from the 2015 Pipe Invitational at the Banzai Pipeline, Hawaii












The rest are here...
Forum: Pentax News and Rumors 11-05-2015, 12:31 AM  
Shots of screen and dials on the new FF Pentax
Posted By HawaiianOnline
Replies: 249
Views: 47,589
Condolences on your loss... :(
Forum: Pentax News and Rumors 06-13-2015, 03:39 PM  
"Everything Changes" with this Announcement: June 8
Posted By HawaiianOnline
Replies: 769
Views: 92,172
In my experience, NDs are rubbish for a photoshoot where you need reliable autofocus and you have to deal with strong ambient light.
Forum: Pentax News and Rumors 06-12-2015, 12:43 AM  
"Everything Changes" with this Announcement: June 8
Posted By HawaiianOnline
Replies: 769
Views: 92,172
Sync at 1/8000? That could be very useful for anyone doing outdoor portraiture (wedding, senior portraits, fashion) where you want to be able to drop the ambient light level enough so that you can take advantage of large aperture lenses for creamy backgrounds. I think that this would be really useful for sunset portraits. Expensive though....
Forum: Pentax News and Rumors 04-22-2015, 03:40 PM  
Pentax K-3 II Officially Announced
Posted By HawaiianOnline
Replies: 1,015
Views: 93,599
They have a "hands on review". Not comprehensive, but it's something...
Forum: Pentax News and Rumors 04-22-2015, 03:32 PM  
Pentax K-3 II Officially Announced
Posted By HawaiianOnline
Replies: 1,015
Views: 93,599
The photos show the new DA 16-85mm mounted. I wonder if it will be offered with it in a kit?
Forum: Pentax K-5 03-12-2015, 12:23 AM  
Last chance for the K5IIs
Posted By HawaiianOnline
Replies: 24
Views: 3,048
Looks like they've just been discontinued from B&H....
Forum: Pentax K-5 03-01-2015, 01:29 PM  
Camera setting for sun wedding
Posted By HawaiianOnline
Replies: 14
Views: 1,420
35mm on a FF, 21mm - 24mm focal length, f/8 and be there...
Forum: Sold Items 02-07-2015, 08:25 PM  
For Sale - Sold: Sigma 100-300 F4 for Pentax
Posted By HawaiianOnline
Replies: 60
Views: 6,656
I'd buy this, if I had the moolah to do it with... Maybe after I get my tax refund...
Forum: Pentax DSLR Discussion 02-07-2015, 01:06 AM  
Poll: Who's sticking with APSc?
Posted By HawaiianOnline
Replies: 126
Views: 8,338
This man speaks wisdom. My own photography has a mix of different subjects from macro to sports. For me, FF would benefit some situations and APS-C would benefit others...
Forum: Pentax Forums Giveaways 12-14-2014, 01:08 AM  
3 Million Post Giveaway: Confirm your entry!
Posted By HawaiianOnline
Replies: 2,854
Views: 79,097
Good luck everyone!
Forum: Homepage & Official Pentax News 12-10-2014, 07:42 PM  
Pentax K-5 IIs Discontinued
Posted By HawaiianOnline
Replies: 16
Views: 1,238
Cheers to a great camera! Retirement does not make it any less of a camera...
Forum: Pentax News and Rumors 08-17-2014, 11:12 PM  
Pentax forum questions for Ricoh at Photokina
Posted By HawaiianOnline
Replies: 322
Views: 25,005
Well, it didn't take long for this thread to completey and totally derail...:p
Forum: Pentax News and Rumors 08-12-2014, 12:05 AM  
Pentax forum questions for Ricoh at Photokina
Posted By HawaiianOnline
Replies: 322
Views: 25,005
Long lenses besides the 560?
Forum: Pentax News and Rumors 08-01-2014, 01:07 AM  
Photokina!
Posted By HawaiianOnline
Replies: 877
Views: 84,794
I hope to see a "year of the lenses". Just what those lenses will be is currently a mystery...
Forum: Pentax SLR Lens Discussion 07-20-2014, 07:02 PM  
Sigma 300mm f/2.8 EX DG
Posted By HawaiianOnline
Replies: 57
Views: 6,263
Congratulations! Make sure to test it thoroughly.
Forum: Pentax SLR Lens Discussion 07-18-2014, 12:38 AM  
Sigma 300mm f/2.8 EX DG
Posted By HawaiianOnline
Replies: 57
Views: 6,263
I have the Sigma 300mm f2.8 and it's served me very well...


I'iwi, Hawaiian Honeycreeper
Pentax K-5 IIs, Sigma APO 300mm f/2.8 EX DG
1/500s f/5.0 at 300.0mm iso80, Pentax 1.7x AFTC


Billabong Pipeline Masters, 2012
Pentax K-5 IIs, Sigma APO 300mm f/2.8 EX DG with Tamron 1.4X TC
1/640s f/3.2 at 300.0mm iso100


Surfing at Waimea Bay, 2009
Pentax K20D, Sigma APO 300mm f/2.8 EX DG w/ Pentax 1.7 AFTC
1/640s f/4.0 at 300.0mm iso320


The US Navy Blue Angels at the Kaneohe Bay Air Show, 2012
Pentax K-5, Sigma APO 300mm f/2.8 EX DG
1/800s f/4.0 at 300.0mm iso800
Forum: Pentax News and Rumors 07-11-2014, 04:52 PM  
Image Transmitter 2 to be released September 26
Posted By HawaiianOnline
Replies: 24
Views: 5,941
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