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Forum: Film Processing, Scanning, and Darkroom 12-27-2009, 12:01 AM  
How dark, darkroom has to be?
Posted By photog
Replies: 47
Views: 23,358
You wrote"Btw. some people have told me that you cannot work with B&W film under red light, because most current films are sensitive to it.
Is this true for B&W as well?
How do you make prints then, or is the paper still insensitive ?"
B&W film is termed "panchromatic" that is sensitive to light of all colours and should be processed in total darkness. However since you will be using some sort of film tank it is merely necessary to load the film in the dark. The processing can be carried out under normal room light. Some have in emergency climbed in under the blankets to load tank!
Paper on the other hand is not sensitive to light fron the yellow to red portion, is nowhere near as fast as colour film and can be processed under a bright amber safelight. Colour film is sensitive to all colours and is in any case usually machine processed as temperature control is very critical (+- .5C or less)
After processing many tens, perhaps hunderds of negs and prints in everything from sou plates to high-speed continuous machines, I am now happy to shoot digital and "develop" in Adobe LIGHTroom.
Forum: Photographic Technique 11-08-2009, 08:59 PM  
Shooting the moon light
Posted By photog
Replies: 15
Views: 7,387
mysticcowboy - You said that right.
Forum: Pentax DSLR Discussion 10-01-2009, 02:19 AM  
K10d shots w/o post processing
Posted By photog
Replies: 18
Views: 4,103
Fisherofgrizz: You ask, "I'd hope Pentax was capable of achieving this as well if I could find the correct set of adjustments. Why? That is why do you want walk away from utilizing the capabilities of the dSLR? However if you photograph nothing but standard grey cards you will get it right every time. But the real world is not 28% reflectance grey - fortunately! "Maybe I'm asking too much." Yes you are but you are losing the pleasure that making an ordinary image jump off the screen / page and make people gasp.
There is no magic bullet so enjoy the journey (to beautiful images).
Forum: Pentax DSLR Discussion 10-01-2009, 02:09 AM  
What constitutes correct exposure?
Posted By photog
Replies: 29
Views: 5,310
Mark, I by “Correct” exposure. I meant“optimum” exposure.
Since ½ of the data in a digital image is in the brightest stop of the histogram (simple arithmetic - next stopwill be 1/2 the next 1/4 etc) an image exposed as close as practicable to the right will give you the maximum amount of information to work with. If you are one stop from the right you have lost 1/2 of the information.

However, if one or 2 of the channels is clipped that is too far to the right.
The K20D in common with a number of other DSLR’s, has a response that rolls off at the high (R.H.) end so if I want as much highlight separation as possible I back off a little.
Within those limits, I believe that exposing as near a possible to the right provides the best starting point for post processing.
As far as I am concerned, the appearance of the image prrior to processing (too light or too dark) is quite irrelevant.
A rational aapplication of ETTR gives the best chance of retaining shadow detail. If shadow clipping is unavoidable it is preferable to clipping anything but specula (reflections off chrome etc) highlights.
Forum: Digital Processing, Software, and Printing 10-01-2009, 01:59 AM  
Lightroom 2.5 + Elements 8
Posted By photog
Replies: 6
Views: 3,923
Lightroom 2 (now in v2.5) is every photographer's dream. It allows non-destructive eding of my RAW files. I use 16 bit AdobeRGB or even ProPhoto and down-mix on export. Editing a large shoot can be a daunting prospect; however; I suggest you set Auto for automatic processing. For those special shots you can fine-tune the auto, if you need to. This makes shooting RAW little harder than shooting JPG.
If you shoot JPG you can still adjust them nondestructively (do it in 16bit AdobeRGB) and resave as jpg / tif or whatever you want.
If you check tha histogram of the exported files you will see little or no banding / combing indicating no significant loss of data. Magic!
Forum: Pentax DSLR Discussion 09-30-2009, 07:37 PM  
What constitutes correct exposure?
Posted By photog
Replies: 29
Views: 5,310
Hi Will. You wrote "when shooting ETTR, you should dial the camera's contrast setting down as low as possible". I appreciated the link you included. That is excellent advice.
The image as displayed on the screen is based on the JPG settings you have in force.
BTW I like your images and it without a doubt that if you do make a mistake LR2 gives the best chance of rescue.
Forum: Pentax DSLR Discussion 09-30-2009, 07:29 PM  
What constitutes correct exposure?
Posted By photog
Replies: 29
Views: 5,310
Hi Mark, when I wrote “Correct” exposure. I choose my word wrongly. I should have said “optimum” exposure.
In view of the fact that ½ of the data in a digital image is in the brightest stop of the histogram, an image exposed as close as practicable to the right will give you the maximum amount of information to work with. If one or 2 of the channels is clipped that is too far to the right.
The K20D in common with a number of other DSLR’s, has a response that rolls off at the high (R.H.) end so if I want as much highlight separation as possible I back off a little.
Within those limits, I believe that exposing as near a possible to the right provides the best starting point for post processing.
As far as I am concerned, the appearance of the image (too light or too dark) is quite irrelevant.
This gives the best chance of retaining shadow detail. If shadow clipping is unavoidable it is preferable to clipping anything but specula (reflections off chrome etc) highlights.
Forum: Pentax DSLR Discussion 09-30-2009, 05:56 PM  
What constitutes correct exposure?
Posted By photog
Replies: 29
Views: 5,310
Mark: RE "correct" exposure. Please pardom my poor choice of words, I should have said "optimum" exposure.
Since the brightest "f-stop" recorded contains 1/2 of the total data, I believe that exposure to the right is advisable provided that it does not cause clipping of any of the channels. Since the K20 and other camera response rells off somewhat at brightest values, it is advisable to avoid pushing the histogram too far to the right.
Forum: Digital Processing, Software, and Printing 09-30-2009, 04:49 PM  
Lightroom 2.5 + Elements 8
Posted By photog
Replies: 6
Views: 3,923
Will, LR2.5 is everything you say. Your comments on Elements 8 are very interesting. Does it allow batch-processing?
Forum: Pentax DSLR Discussion 09-29-2009, 11:07 PM  
K20 multi exposure v K7 HDR
Posted By photog
Replies: 59
Views: 10,829
Kittykat
The use is to allow you to undertake creative projects limited only by your imagination. Stacking V high ISO and appropriate blending mode will have a magical effect on grain.
Also Tourist elinination - street scene. (do Google search for info)
Forum: Digital Processing, Software, and Printing 09-29-2009, 11:01 PM  
Camera Raw Settings for k20d
Posted By photog
Replies: 18
Views: 5,046
Yes the update for ACR and LR2 is generally acompanied by a camera profile.
Forum: Pentax DSLR Discussion 09-29-2009, 10:59 PM  
Images too Bright with k20D
Posted By photog
Replies: 13
Views: 2,557
Rich, when I say I judge correct exposure by checking the LCD screen I check all of the data available - the histogram and the indications of clipping both highlights and shadows. But if I must sacrifice one or the other, I will allow shadow clipping.
However I must say that even though the camera shows some shadow clipping (this rendering is based on the jpg 8bit sRGB setting when the image is processed in ACR or LR2 in ProPhoto of Adobe RGB there is rarely any clipping in the resultant image.
The appearance of the image in the LCD is IRREVALENT.
Forum: Pentax DSLR Discussion 09-29-2009, 10:42 PM  
What constitutes correct exposure?
Posted By photog
Replies: 29
Views: 5,310
ozlizard, I shootin PEF the native format as it reduces the processing time in camera a little. Conversion with DNG converter reduces file siz on HDD by about 40%
Forum: Pentax DSLR Discussion 09-28-2009, 11:53 PM  
What constitutes correct exposure?
Posted By photog
Replies: 29
Views: 5,310
I would welcome the comments of our members on this topic.
Many posts have claimed that the K20 overexposes.
My experience contradicts this. I follow the ETTR rule with the proviso the highlights with the exception of spectral highlights (reflections) should NOT be clipped.
The image on the LCD screen mat appear too bright, but who cares, The camera previews using the JPG settings selected in your setup. This will deliver an image with little of no shadow clipping.
All of my exposures are in Manual, PEF format. DNG converter (Free) converts to DNG for processing in LR2.
You decide after the event how much shadow detail you want to have.
Forum: Pentax DSLR Discussion 09-28-2009, 11:40 PM  
Images too Bright with k20D
Posted By photog
Replies: 13
Views: 2,557
Alex I hav moved from the K10 to the K20. My experience with MY unit is that although the 10 was prone to over-exposure the 20 is much more accurate.
I use both cameras in Manual mode. I may do a digital preview or simply make a trial exposure and adjust the exposure. I then shoot without further measurement a long lighting and subject matter does not change. Just what I used to do with the 500C Hasselblad when I was shooting weddings etc. I used an incident light meter and got the shadow detail and let film latitude look after the highlights. It worked and allowed accurate and fast shoting.
With digital of course you expose to protect the highlights from blowing out. The histogram is as good or better that a top quality light meter.
And BTW I use matrix metering.
Forum: Pentax DSLR Discussion 09-28-2009, 11:27 PM  
K20 multi exposure v K7 HDR
Posted By photog
Replies: 59
Views: 10,829
Hello again ozlizard
Good to see that you are putting the K20 to good use. Some of the posts in this topic made me wonder whether some of the responders are confusing Exposure Bracket Mode with Multi-exposure Mode.
Am I correct in believing that you used Multi-exposure? Dosdan and others ask about exposure compensation. If those wondering read the manual they will find that when you set the number of shots to take the camera will compensate and give the correst exposure.
If the camera is set to exposure bracket with the compensation set to zero you get a set of images that Photoshop (and no doubt other software) can stack and blend.
This is great for fireworks. I just set the camera for auto exposure. lock my remote release on and keep shooting sets of 4sec, F8, 100 ISO until the buffer is full (if it does fill). Photoshop can blend the shots so that you can increase the "population" of bursts.
Forum: Digital Processing, Software, and Printing 09-28-2009, 11:01 PM  
Camera Raw Settings for k20d
Posted By photog
Replies: 18
Views: 5,046
Further research (and experimentation) have led me to suggest that that the best camera profile for EITHER DNG or PEF is Adobe Standard. If you want to make the result more Pentax JPG for some reason try Camera Standard. Both of these are designed for the K20 of whatever camera you use. If you go to adobe labs and download cameraprofiles beta2 you can expand them and you will find that Adobe Standard is actually a folder containing a large number of profiles each of which is specific to one of a v. large number of cameras of every model supported by Adobe. They appear to be shared by ACR and LR2.
What really sells me on the Adobe Standard is that it renders strong reds and oranges and the like with the greatest realism.
I hope this is of some help.
Forum: Digital Processing, Software, and Printing 09-26-2009, 11:12 PM  
Camera Raw Settings for k20d
Posted By photog
Replies: 18
Views: 5,046
tateventzo, I am even more confused since reading your last post. As Marc has writen there is NO correct colour. I take your mention of grey card to mean that you photograph a grey card to get a reference for white balance. This is fine.
As to whether you like or dislike the ACR rendition of your images, have you had your monitor profiled? If not what you are seeing on your monitor may be nothing like the real images. Have you examined the images on other systems?
Use the ACR 4.4 or the Adobe Standard profiles - chose the one you like. You can fine-tune the result to your satisfaction.
Forum: Digital Processing, Software, and Printing 09-23-2009, 10:46 PM  
Camera Raw Settings for k20d
Posted By photog
Replies: 18
Views: 5,046
ACE4.4 is fine. You take it from there. nevdertheless the auto setting is very capable and may do most of your processing. Irt certainly si a good starting point.
Forum: Digital Processing, Software, and Printing 09-23-2009, 10:17 PM  
Lightroom 2 - auto stack RAW with JPEG? Propagate changes through stacK?
Posted By photog
Replies: 13
Views: 4,827
pingflood: The actual question was, " Lightroom 2 - auto stack RAW with JPEG? Propagate changes through stacK?"
It seems to me that like myself most of the respondents do not know whether LR2 can autostack and propogate changes throughout the stack. That being the case we have taken a lesson from the polititions and answered the question we want to answer.
Forum: Digital Processing, Software, and Printing 09-22-2009, 12:30 AM  
CS4 Portable and camera raw?
Posted By photog
Replies: 6
Views: 8,600
"once you've told me that portable cs4 = stolen cs4 i will certainly no go with my problems to adobe forum". Then you are on your own.
Forum: Digital Processing, Software, and Printing 09-22-2009, 12:26 AM  
Help with DNG files
Posted By photog
Replies: 10
Views: 3,713
As a point of interest to any who may be thinking of downloading and trying DNG Converter 5.5, the preferences allows you to select the compatibility of the dng produced. If you are using an earlier version of ACR you may beed to select the appropriate compatibility. Cool, Eh!
Forum: Troubleshooting and Beginner Help 09-21-2009, 01:04 AM  
K2000 drops frames occasionally
Posted By photog
Replies: 4
Views: 2,116
dragonfly - This is almost certainly due to the memory card. A good test is to hold the release down for the longest burst lour camera can record. (within reason!)
If possible return the card for refund and buy a reputable brand. I have been using Kingston SDHC. I have one 8 GB of these cards and two 16 GB cards. I have never dropped a frame - K10D and K20D.
I have however experienced it with other cards.
Forum: Troubleshooting and Beginner Help 09-21-2009, 12:56 AM  
Polarizer Question
Posted By photog
Replies: 12
Views: 1,923
DennisH: Most polarizing filters are also neutral density filters with a value of 3 stops. The amount of light transmitted by a polarizing filter also depends on the angle of the filter to the light source (the sun) so it may actually have an effective value of 4 stops. This is in line with your experience.
It is worth noting that super-wide angle lenses do not make good partners to polarizing filters as the effective angle of the light changes from one side of the image to the other.
Forum: Digital Processing, Software, and Printing 09-20-2009, 11:02 PM  
How to avoid Jpeg artifacting?
Posted By photog
Replies: 12
Views: 4,438
Does Microsoft Paint resize the image as well as compressing it?
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