kevin_keller

<p>Never give work away for free. It just sets a precedent for more people to expect free.</p>

<p>I have a lot of experience with these kinds of labs as a ex field service tech for a photo lab manufacturer. It is more about the operators then the equipment or chemistry. If you can find a lab wether it be a CVS, or other weed store that has knowlegable people who care then you should be allright. I would ask them how often they test the chemicals especially the film machine. If labs have a low turn over of chemistry it just goes bad in the tank. So it has to be replaced after a few weeks because it just becomes exausted from lack of replenishment. Hope this info helps you. Oh and when using a new lab always drop of a test roll first. I recently used a Pro lab and they ruined all my film (sheet film) that I took them because it got wet in the night drop box. They told me after I picked it up I should put the film in a zip lock bag because their drop box leaks when it rains. No note on box about it or on web site.</p>

<p>Just shoot then shoot somemore. That really is the best way to get better. Good luck.</p>

<p>I have over 15 years experience working with 1 hour labs that are in CVS, Walgreens, Riteaid and Walmart. The biggest factor in the operation of the lab is the employees. If you can find a lab that has a photo knowlegable person then the lab is ussually well maintained. Though in most cases training is very poor if there is any, and the people running them are really very inexperienced with the operation of the lab. The labs are supposed to run control strips every morning to check the chemistry and that the equipment is working normally. In a lot of cases they dont even run the strips or they run the strips and even read them but regardless of the results will run customer film. I can tell you some real horror stories about what I have seen but I will just share this one that I have seen repeated many times. THey run the film through a bad processor and when the customer picks up the film they tell the customer that the customer screwed up. So when picking a lab to use take a test roll there, talk to the emloyees and ask some questions to see what they know. Observe how they treat film and how clean or dirty the equipment is, these are very good indicators of how well the lab is maintained.</p>

<p> If you use the same lens on different size formats you are capturing more of the image with the larger format. You will see more of the effect of DOF in that image. The image that captures a smaller area of the cirlce will still have the same DOF as the other image you are just seeing less of the effect. But in either case the only way to change the DOF is to change Fstop, distance to subject, or focal length.</p>

<p>Would that be a perceived DOF and not accual DOF. The image from the aps will be a little softer overall compared to the 35mm. Also to change that situation you would have to change Fstop Distance or focal lenth on the camera with the aps.</p>

 

<p>So Mike you are saying that if you place two cameras one with 35mm format sensor and one with aps size sensor at the same distance from a subject and use the same lens on each one you will have different DOF on each one due to different sensor size.</p>

<p>The simple answer is that DOF is controlled by 3 factors. Focal lenth, distance to subject, and apeture. The size of the sensor will not change the DOF unless you make a change in one of the three factors. Depth of field is a property of the physical characteristics of the lens.</p>