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Forum: Lens Clubs 01-28-2021, 04:10 PM  
Adaptall Mount Club (Tamron).
Posted By UlrichSchiegg
Replies: 4,287
Views: 757,137
SP 300mm 2.8 60B
Forum: Post-Processing Articles 12-31-2020, 03:14 AM  
Sigma 8-16mm modifier program
Posted By fs999
Replies: 27
Views: 11,895
A new Version 1.5.0 (31/12/2020)
  • Larger Image preview (hidden when you fly over with the mouse)

  • ExifTool is now located in C:\ProgramData\ExifTool (Win10 compat.)





Download

Installation filePentSigSetup.exe6.80 MB
7-Zip file
PentSig.7z6.78 MB

Note : The installation file PentSigSetup.exe and PentSig.7z are compressed files, some anti-virus programs don't like that. But I can assure you there are no viruses, trojans and fishings in them !

Note 2 : From time to time you can update ExifTool to be compatible with new raw formats... You only have to copy the new file in C:\ProgramData\ExifTool.


This program is copyrighted by me, freely usable for PentaxForums members, but not transferable on an other site.
ExifTool is a free program from Phil Harvey and can be redistributed and/or modified under the same terms as Perl itself.
7-Zip from Igor Pavlov can be freely downloaded from his site.
Forum: Lens Sample Photo Archive 09-28-2020, 04:02 AM  
ELICAR V-HQ Macro MC 90mm f/2.5
Posted By pepperberry farm
Replies: 23
Views: 11,930
tree frog by Pepperberry Farm, on Flickr

tree frog by Pepperberry Farm, on Flickr

tree frog by Pepperberry Farm, on Flickr

toes by Pepperberry Farm, on Flickr
Forum: Lens Sample Photo Archive 07-01-2020, 03:38 AM  
ELICAR V-HQ Macro MC 90mm f/2.5
Posted By pepperberry farm
Replies: 23
Views: 11,930
spider by Pepperberry Farm, on Flickr
Forum: Repairs and Warranty Service 12-13-2019, 08:30 AM  
Yellowed Thorium Glass Lens FIX- Cheap (under $20US), Fast EASY
Posted By steamloco76
Replies: 34
Views: 3,611
I know there are other threads regarding using UV light to remove the yellow/amber/brownish tint which many 1950's-1970's Thorium glass containing lens develop. I'm adding this one because I found a super easy to use UV blacklight flood lamp which operates at a cool enough temperature to allow the lens to sit right on the flood light glass! I've done two fairly severely yellowed Takumar 50mm F1.4 lenses and the results have been OUTSTANDING.

Lens #1 was a late 1960's vintage Super-Takumar 50mm f1.4 with splotchy dark yellow elements. After about ten hours on the lamp face down and another ten face up, the lens is as clear as the day it left Japan. Lens #2 was a Super-Multi-Coated Takumar 50mm f1.4 from around 1971. It was evenly yellowed. I did the same treatment to it with equally excellent results. Photos of its treatment and the lamp are attached.

The BEST part? The UV flood lamp is only $16.99 US on AMAZON. It is a 10 Watt output version. They also sell 20 Watt and higher versions, however those lights generate more heat and would require the lens to be moved away from the lamp to keep the lubricant from overheating.

All you have to do is set the 10 Watt HouLight UV Black Light Flood Lamp on a flat surface with the light lens facing straight up. Plug the light into a 3 prong 110-115V receptacle. Take your Thorium yellowed lens, open the aperture fully and set it face down, centered over the LEDs in the UV lamp. I put mine on a rubber collapsable lens hood to be sure the lens elects didn't contact the lamp glass. After 8-10 hours, turn the lens over so the rear element is now toward the UV lamp and let it go another 8-10 hours. Check the lens by looking at something white under good lighting. If there is no more yellow cast (coatings are a bit yellow, so allow for that) you are DONE. If there is still some yellow, give it more time on the lamp. Easy. The HouLight is rated for 5000 hours of use, so you can do your friends lenses Too.
Forum: Post Your Photos! 04-16-2019, 11:27 AM  
Nature New guest applying for planning permission in my shed.
Posted By Flanoman
Replies: 6
Views: 532
I have been over doing it with DOF because I'm trying to nail the auto focus on my k70. I'm coming from manual focus film pentax cameras and lenses . I wish there was a split focus centre in the view finder and I would just manual focus. old habits die hard.
Forum: Lens Clubs 04-06-2019, 09:55 AM  
Adaptall Mount Club (Tamron).
Posted By CheepShot
Replies: 4,287
Views: 757,137
Some shots with a 60b

Red-Tailed Hawk with Jetpack by CheepShot, on Flickr

Fox River Morning-Nikon F3 by CheepShot, on Flickr

Fall Fireworks by CheepShot, on Flickr
Forum: Lens Clubs 04-01-2019, 08:06 AM  
Adaptall Mount Club (Tamron).
Posted By luftfluss
Replies: 4,287
Views: 757,137
I saw your post on the acquisitions thread...welcome to the 360B club!!!

I really hope you get a chance to post pics soon.


I've had what I consider to be reasonable success using mine with stacked AFA 1.7x and A 1.4x-S TC's.








The 360B also works reasonably well with the A 2x-S TC.

Forum: Digital Processing, Software, and Printing 01-20-2019, 02:04 AM  
Fixing Adobe's problem with maps in LR 5 and LR 6
Posted By beholder3
Replies: 4
Views: 1,219
Since Adobe seems to try to grab a lot of money from users but not fix their self caused problems, some users have worked on the issue that LR 5 and 6 map functionality is still broken.

GitHub - astuder/lightroom-map-fix: Fixing the Map module in Lightroom Classic

This is not for noobs.

The better free map module replacements are GeoSetter (Description - GeoSetter), which can use OpenStreetmaps and darktable (darktable).
Forum: Post Your Photos! 06-28-2018, 07:24 AM  
Black & White Self-portrait study
Posted By krre23
Replies: 20
Views: 1,136


Self-portrait studying the composition, mood and aesthetic of the portrait made by Irving Penn to Truman Capote Link to the photo by Penn

Natural light + Lightroom
Forum: Troubleshooting and Beginner Help 04-21-2018, 06:15 AM  
Wierd Samyang 14mm F2.8 ED AS IF UMC problem
Posted By Markovo
Replies: 8
Views: 1,621
Following the videos over YouTube, I think I managed to fix my lens. I've done some test and it all seems good for now. Lets hope it stays that way!

Greetings from Bulgaria!
Forum: Pentax Q 03-30-2018, 06:34 PM  
Focus adjust on the Pentax 07 shield lens
Posted By 2old4toys
Replies: 33
Views: 5,560
I searched but could not find anyone else who had done what I was thinking and so this morning went ahead and did it myself. I like the Qs body cap lens for its toy camera charms with instant low fi blurred edges, but only disliked how it was fixed focused just too close for me to be able to use it more often.

Happy to report I found it is very simple to get the Pentax 07 Shield Lens to focus a little further away than it did out of the box.
Just take it apart and wiggle out the 1 lens just a tiny bit out from its housing and you are done. The lens is held in place by 3 segments of rubbery material that grips it to the plastic housing. Incidentally I saw a lot of fine dust had collected in my lens trapped between the lens body and the glass so removed it entirely for a wipe down before reinstalling except with an added fraction of a mm away from being fully pressed down into the housing the way it was originally installed. The lens seated closer to the sensor can now focus further away even to infinity! If I need to focus closer again, I can just partially twist unmount the lens from the Q body to add back a little distance between the lens and the sensor for the opposite effect. Sample photos to come.
Forum: Post Your Photos! 01-27-2016, 05:38 PM  
Nature Northern Harrier
Posted By bestwun
Replies: 10
Views: 775
Another raptor.
Forum: Post Your Photos! 01-25-2016, 07:21 PM  
Nature Burrowing owls, again )))
Posted By micromacro
Replies: 8
Views: 819
Funny and cute guys :)
Forum: Digital Processing, Software, and Printing 01-22-2016, 09:25 PM  
PEF and DNG file question.
Posted By Not a Number
Replies: 14
Views: 1,428
The word is codec which is the blend/abbreviation of the words coder and decoder. The plural would be codecs. Modem is a similar blended word from modulator - demodulator.
Forum: Pentax SLR Lens Discussion 03-07-2014, 06:06 PM  
My Most Awesome Experience With The Greatest Lens Ever Made
Posted By GoremanX
Replies: 100
Views: 10,321
OMG! I just got this sweet new zoom lens! It's a SMC Pentax DA 18-135mm F3.5-5.6ED AL [IF] DC WR.

As soon as I pulled it out of the box, I just KNEW this thing was retina-slicing sharp. And it turned out to be true! Like a prime lens at every focal length, it's amazing (I know because I saw a picture from a prime lens posted on this forum last week)! The bokeh is oh-so-perfect and flawless, and the colour rendition... it's to die for. In fact, I already killed someone with it. It's THAT good!

The build quality is out of this world! All-metal construction, except for the plastic barrels, outer shell, focus ring and zoom ring. It came with an ultra-high quality front lens cap, and a pretty good rear cap. There's also a nice oddly-shaped plastic sleeve that fits around the zoom ring, I assume to protect the zoom ring during transport. How thoughtful!!! A zoom ring shield!!!

Since this lens is weather resistant, I figured I'd test it by submerging it in a large vat of diet Pepsi. It passed! But then the zoom ring became a little harder to turn. Probably just needs more breaking-in. Also, the buttons on the camera tend to stick now... typical Pentax quality control. When will they ever learn?

But that's not all! To further justify this lens' cost and convince myself and everyone else that I made a wise purchasing decision, this lens also auto focuses like greased lightning on ice, except it's completely silent! The SDM DC motor is perfection itself. There's nothing wrong with it, and never will be. Pentax clearly fixed all SDM issues. I can focus from my foot to the ceiling in less than one second flat.

After I gave myself whiplash by performing the above test repeatedly, I noticed that the lens also weighs relatively little compared to my friend's FA* 600mm F4. It's also a bit smaller than that lens, so that's a big plus. With the exception of overall sharpness, contrast and colour rendition, the image quality is EXACTLY THE SAME. I bet my friend gets real jealous when he sees this.

It's not all good and awesome, though. I did come across some problems. First and foremost, this range of focal length sucks. It's not at all what I needed. What I really needed was a 300mm F2.8 prime lens. Why isn't this lens like that? I'm deducting 2 points from its score because it's not the focal length I need. For that matter, the perfect lens would be a 10-600mm f1.2 zoom. With today's technology, this should be dead easy. But once again Pentax is behind the curve. Are you listening Pentax? Make a 10-600mm f1.2 macro lens that's weather-resistant, light as a feather, produces retina-slicing sharp pictures at all apertures, and has no aberrations or distortions whatsoever, and THEN I might start taking you seriously. Until then, Canon/Nikon/Casio will always have the upper hand!

Anyways, some samples to whet your appetite. Don't worry, I've got more coming!

My Dog


My TV (check out the bokeh!!!)


Macro Of My Dog

(I showed him one of these retina-slicing sharp pictures, that's why his eyes are bleeding)

You might need an optometrist to get your retinas un-sliced after looking at those pictures. Unfortunately, optometrists don't actually do surgery, so you'll have to live with deflated eyeballs for the rest of your life. Sorry.
Forum: Post Your Photos! 12-24-2013, 03:18 PM  
Nature Arctic Fox
Posted By jac
Replies: 5
Views: 668
This little guy had the courtesy to hang around while I attached the longest lens I had with me and fiddled with buttons and wheels to get enough light onto the sensor.
Forum: Digital Processing, Software, and Printing 06-01-2013, 11:54 PM  
Correcting EXIF for Sigma lenses
Posted By newmikey
Replies: 10
Views: 3,308
Some lenses of Sigma are known to share an ID code with older lenses. My Sigma 17-70mm f2.8-4.5 for instance is recognized and coded by the camera firmware as "Tamron 35-90mm or other Sigma lens" into the exif data. Other issue is well known with the Sigma 8-16mm where focal lengths under 10mm are shown as "0" in the exif.

The issue hits users of commercial software as well as open source whenever the software attempts to correct lens geometry or CA based on exif makerinfo, the correction will fail altogether or use the wrong lenstype.

Over the years I've seen snippets of potential solutions pass by here and I've finally found the time to code them together in my raw processing script. In the spirit of forum sharing and open source, I'm of course sharing.

Now, I'm a crappy coder even on the best days so I'm sure someone can make it prettier but here it is. My lens correction library now correctly recognizes the 17-70 and corrects its (especially between 17 and 20mm sometimes very obvious) distortion and the exif info on my UWA shots with the 8-16mm now correctly show the focal length if it was 8 or 9 mm






QuoteQuote:

lensexif=$( exiv2 print -p a $i | grep "Exif.Pentax.LensType" | awk '{print $5}' )
echo "Lens="$lensexif"!!!"
if [ $lensexif == "35-90mm" ]; then
echo "Correcting lens information to Sigma 17-70mm on " $i
exiv2 -M"set Exif.Pentax.LensType Ascii Sigma 17-70mm f/2.8-4.5 DC Macro" $i
else
echo "No Sigma 17-70mm detected on " $i
fi
if [ $lensexif == "(0x0812)" ]; then
echo "Correcting focal length for Sigma 8-16mm on " $i
exiftool -progress -overwrite '-exif:FocalLength else
echo "No Sigma 8-16mm detected on " $i
fi



(this is bash but I'm sure it shouldn't be to difficult for others to "translate" this to whatever Windows uses as script language, I hope.
Forum: Post Your Photos! 05-29-2013, 01:09 PM  
Nature Duck Duck Goose
Posted By daacon
Replies: 7
Views: 862
I got nothing but birds lately. Hope to get out to the mountains this weekend or next. But for now it's trips to the wetlands , I enjoy it :D

click on inage twice for larger view





Forum: Post Your Photos! 03-01-2013, 08:15 AM  
Nature New American Tenor Debut!
Posted By gjtoth
Replies: 17
Views: 1,124
Ooooo sole mioooooooooooo!



No puede serrrrr! No hay comida para m, no puede ser!

Forum: Post Your Photos! 02-08-2013, 08:36 PM  
Macro Desperate Last Grasp. RIP
Posted By cmohr
Replies: 9
Views: 865
Poor Little Bugger, Looks like he was reaching out for some help, that never came. Black and White Jepg straight out of the camera, ISO - 125, f - 7.1, 1/250th of a second.
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