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Forum: Post-Processing Articles
12-21-2023, 05:57 PM
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How do I create a high quality Jpeg from my TiFF file? Rawtherapee doesn't list Jpeg as one of the available file formats.
Yes, You correctly diagnosed the problem I was having. When I went through your procedure, I saw that there was a step to turn on tone correction. I thought that it was already on, so I skipped the step - BIG mistake. It was my fault that the tone corrections were not working. Thanks for your help.
Tom
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Forum: Post-Processing Articles
12-21-2023, 12:54 PM
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My DNG file from photographing my negative (K1 MkII with a Sigma 70mm Macro) is 45-55 MB. After processing with GIMP and RawTherapee, when I create a Tif file, it is 425 MB!!! That is almost a half a Gigabyte for one photo. What am I doing wrong?
I am archiving hundreds of negatives and the storage would be immense. Should I convert to high quality Jpegs? I would still have the DNG files if I wanted to do any additional processing in the future.
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Forum: Pentax Price Watch
04-10-2014, 10:32 PM
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It's funny - Resellerratings, Yahoo, and Epinions all rank them 4 stars or better. Once you read the reviews - you wonder how they ever got 4 stars with so many horror stories. Maybe they were good at one time, but after reading the links you provided, I would never order anything from them.
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Forum: Pentax Price Watch
04-10-2014, 05:36 AM
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Forum: Pentax Price Watch
03-29-2014, 12:06 PM
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That looks like a leaf shutter lens - so my guess is that the L stands for leaf shutter.
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Forum: Troubleshooting and Beginner Help
02-21-2014, 09:46 PM
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If you bought it with a credit card you might check if you have a damage protection clause. My daughter knocked my brand new K10 off the counter when it was a few days old. My credit card company paid for the $300 repair.
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Forum: Pentax SLR Lens Discussion
11-28-2013, 11:20 AM
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I would make sure that you are perfectly perpendicular to the paper you are photographing. One way to do this is to place a small mirror in the center of the paper. If you are perfectly perpendicular to the paper, you will see the reflection of the camera and lens in the mirror.
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Forum: Pentax SLR Lens Discussion
11-28-2013, 11:04 AM
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Sigma 70-200 with a 1.4X teleconverter? That would give you a 98 to 280 F4.0 that focuses fast. You could also use it without the converter when you need speed.
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Forum: Pentax SLR Lens Discussion
11-04-2013, 10:39 PM
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Forum: Sold Items
03-11-2013, 09:12 PM
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I want the Ricoh 300mm. Send me payment info.
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Forum: Pentax SLR Lens Discussion
01-29-2013, 01:51 AM
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The contacts you are referring to on the lens mount are not used by the autofocus on F series lenses since the motor is in the camera. The only contacts used by the autofocus are on SDM lenses.
The contacts you are referring to transmit aperture information to the camera. I think that you may have some mechanical problem with the lens.
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Forum: Pentax SLR Lens Discussion
05-23-2012, 10:39 PM
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AKA "Bokina"
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Forum: Sold Items
04-25-2012, 11:12 PM
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What are you willing to pay?
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Forum: Pentax SLR Lens Discussion
06-26-2011, 10:22 AM
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I think the question is - how much existing light photography do you do indoors? I find that I much prefer flash photography indoors. If you use bounce flash effectively, it gives a pretty natural lighting look. I rarely use my FA50 using existing light, so I rarely use F-stops less than 5.6 - in fact I usually prefer to use my Sigma 18-50 zoom indoors. Hmmm - I think I should consider selling my FA50.
Tom
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Forum: Pentax SLR Lens Discussion
05-15-2011, 10:12 PM
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The item pictured in the ad is the Sigma 400mm F5.6 APO Tele Macro. The 72mm filter is an error, or the photo is an error. The filter size should be 77mm as several people have posted. I have one and I like it a lot. What other lens can you take a 1:3 macro shot from 1.6M away! The focus is fast and accurate although it can tend to hunt in poor light.
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Forum: Lens Clubs
02-27-2011, 08:37 PM
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Forum: Pentax SLR Lens Discussion
07-21-2010, 10:20 PM
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Forum: Pentax SLR Lens Discussion
05-19-2010, 07:20 PM
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I would return it. Even though it will probably will not affect image quality, for that kind of money I would expect perfection. You also have to consider resale value if you ever sell it. If I remember correctly, Adorama will not charge return shipping and are very good about returns.
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Forum: Pentax SLR Lens Discussion
05-18-2010, 08:42 PM
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I think I am understanding what you are asking now. Since the original photo was 4672 pixels wide and covered 2.5mm, the pixel size was 0.53 um. When I uploaded the original file to flickr, the site resized the photo and did not keep a copy of the original size. I am sorry to say that I don't have the original.
Tom
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Forum: Pentax SLR Lens Discussion
05-18-2010, 10:20 AM
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The full frame picture shows approximately 2.5mm. Since the sensor is 24mm across, this is 10:1 magnification. This photo is not cropped in any way. This is not meaningless - if you can make a subject 2.5mm in size take up the entire 24mm frame - this is 10:1 magnification.
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Forum: Pentax SLR Lens Discussion
05-18-2010, 09:30 AM
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Forum: Pentax SLR Lens Discussion
05-18-2010, 06:50 AM
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Those are not crops - they are full frame resized. They are actually 10:1.
Tom
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Forum: Pentax SLR Lens Discussion
05-17-2010, 10:16 PM
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I am talking IQ also. If you are talking color, contrast and resolution, I took pictures both with and without the converter and could not tell any obvious differences in IQ. If there was a loss in IQ due to the converter, it was minimal.
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Forum: Pentax SLR Lens Discussion
05-17-2010, 09:19 PM
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Look at the detail in the picture I took of the metal ruler. Remember - the markings are 1mm apart. You can see every little scratch and imperfection in the surface of the ruler. If this does not convince you, take out a $1 bill and look at the size of the eye on top of the pyramid, then look at the picture in the post. I know that this is subjective proof, but it is hard to get test targets optimized for 10:1 reproduction. :)
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Forum: Pentax SLR Lens Discussion
05-17-2010, 07:52 PM
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