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Forum: Pentax SLR Lens Discussion
05-29-2010, 08:50 PM
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I've seen this discussed on some other photography forums and as I recall, it is because the position of the aperture is moving inside the lens when you zoom, allowing for the constant aperture.
Even if they did make it a variable aperture zoom, it would probably be an f/4 or f/4.5 at the wide end, similar to the Sigma super zooms or the Canon 100-400. It would be too hard to fit a 250/2.8 inside a 600/5.6 tube without getting vignetting.
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Forum: Film SLRs and Compact Film Cameras
05-11-2010, 04:18 PM
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It scans nicely, though.
Having been away from film for several years I was very pleasantly surprised by the quality and dynamic range of this stuff.
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Forum: Pentax SLR Lens Discussion
05-05-2010, 02:04 PM
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Then help me out here.
When you say
it certainly looks to me like you are saying "some MF lenses are rare and expensive, therefore it does not make sense to buy -any- MF lens even if the MF lens you are looking at offers excellent quality and has a low price." If that is not what you are saying then please feel free to correct my interpretation because it simply doesn't add up.
Perhaps if you could explain all those 35mm lenses you have listed in your signature alongside an APS-C camera. Is it okay to use only 66% of the capability of the lens but using 50% is pointless? If I do a search of your earlier posts will I find where you have railed against M4/3 shooters adapting 35mm lenses to their cameras since they will also fall below this 50% usage level?
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Forum: Pentax SLR Lens Discussion
05-05-2010, 09:27 AM
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WTF are you talking about? Yes, some of the MF lenses are rare/expensive. When that is the case you don't buy them. Some MF lenses offer a better value than 35mm lenses and that's when the MF lens makes more sense.
Again, WTF are you talking about? MF lenses don't give have a different DOF or perspective than any other lens. Medium format cameras offer those advantages but a 50mm lens is always a 50mm lens. And buying a MF camera to get those perspective and DOF advantages means you get double duty out of the MF lenses and they make even more sense.
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Forum: Pentax DSLR Discussion
05-03-2010, 08:55 PM
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Yeah, it really is a great place to shoot. Plenty of room on the concrete area in the pics and all along the river towards where the pics are taken from. Parking right there so you don't have to walk too far, public restrooms, sun at your back and plenty of eagles to shoot.
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Forum: Pentax DSLR Discussion
05-03-2010, 07:34 PM
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Connowingo Dam north of Baltimore. Great place for bald eagles. The weather as bad this day so it was less crowded than usual.
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Forum: Pentax Camera and Field Accessories
05-03-2010, 08:36 AM
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Sometimes that is correct, sometimes it would be a waste of time. And everybody seems to be forgetting that a good quality card can also be used for exposure.
For example, earlier this month I took my camera to a hockey game. That means a big "white" surface so any kind of auto exposure is going to be thrown off and artificial lighting that is not a good match for any of the preset values. I put white in quotes because it is far from being truly white and cannot be used for WB. So before the game I went down by the ice and used the gray card to set a custom white balance and manual exposure settings. When I went home after the game I had a bunch of pictures with exposure and WB that were not only perfect but were consistent from shot to shot with no adjustments of any kind needed. The only work I had to do when I got home was to go through the shots and pick out the ones that showed the more interesting bits of action. A couple needed a little different cropping and they all needed to be resized for the web. If I hadn't used the gray card it would have taken me 3-4 times as long to process the images.
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Forum: Film SLRs and Compact Film Cameras
05-03-2010, 08:13 AM
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If you are not interested in developing your film at home then that stuff is actually a good choice. It is a B&W film that is developed in the same chemicals as color film so you can get it processed pretty much anywhere.
The flip side of that is that if you are planning to set up your own darkroom then it is probably not what you want.
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Forum: Pentax Camera and Field Accessories
05-01-2010, 06:57 PM
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Knockoff? Boonie hats were being worn by soldiers in Viet Nam 20 years before Tilley was established as a company.
I have and love a Tilley hat, but if anything the Tilley is an improved version of the older boonie.
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Forum: Film SLRs and Compact Film Cameras
05-01-2010, 09:46 AM
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Noise. I like doing longish expsoure night shots and that means sensor noise when shooting digital. Put a film camera on the tripod and I can leave the shutter open for an hour or two with no ill effects.
Also, old 35mm film gear is much less likely to be stolen.
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Forum: Pentax SLR Lens Discussion
04-30-2010, 02:45 PM
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Nothing. That's the problem.
I have to say that having a focus ring that goes too far is better than one that doesn't go far enough.
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Forum: Pentax DSLR Discussion
04-30-2010, 01:39 PM
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Just imagine how this guy felt when he headed out in the morning with his fishing tackle:
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Forum: Lens Clubs
04-29-2010, 09:29 PM
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Forum: Lens Clubs
04-28-2010, 06:57 PM
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I'd like to see some sample on digital too, if you can. This lens is likely to be my next purchase.
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Forum: Lens Clubs
03-30-2010, 07:41 AM
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Pentax-M 75-150/4 for me. Everything else I have is more common and more easily replaced if I changed my mind.
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Forum: Film SLRs and Compact Film Cameras
03-30-2010, 07:32 AM
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I've got to agree with the others that the B&W is better. You did a great job on this.
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Forum: Photographic Technique
03-29-2010, 08:39 AM
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Could always just create a meetup group at meetup.com.
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Forum: Pentax SLR Lens Discussion
03-28-2010, 12:43 PM
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It is true for pretty much every 35mm lens mount except Minolta and Canon's own older MF lenses.
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Forum: Film SLRs and Compact Film Cameras
03-25-2010, 06:32 PM
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Thanks. These were taken with my KX using Kodak bw400cn film, processed and scanned at the local Costco.
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Forum: Lens Clubs
03-25-2010, 05:19 PM
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Both shot on Kodak bw400cn film
SMC-M 50/1.7 @ f/1.7
SMC-M 28-50/3.5-4.5 @ f/16
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Forum: Pentax SLR Lens Discussion
03-16-2010, 11:08 AM
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They work fine, I use manual Pentax lenses on my Canon digital SLRs all the time. The only issue I have is that my mount adapter is not a tight fit so the lens can wobble a little. Hasn't been an issue in actual use but it doesn't inspire confidence. If anybody can chime in with a specific brand (or ebay source) for adapters with better manufacturing tolerances I'd appreciate it.
One thing to be aware of is that the adapter has to lock the aperture lever to the closed position so stopping down the aperture ring darkens the viewfinder. Basically, the DOF preview button pressed down all the time.
It works fine in Av and M and mine has the focus confirmation chip so I can also use the AF system to confirm focus if I choose.
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Forum: Pentax SLR Lens Discussion
03-02-2010, 02:54 PM
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It has been my experience that SLR lenses work their best one or two stops less than their max aperture. Since so many lenses are f/4 or f/5.6 the f/8 rule has an obvious origin but it is far from absolute. For example, playing around with a test chart and the the 50/1.4 that I use on my Canon cameras I found that f/2.5 gave the sharpest results with that particular lens.
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