My first new lens - Baby beercan
Yeah, probably shouldn't have started a whole thread just for a $25 lens, but I'm excited.
And I guess my first new lens was the kit lens, and the second new lens was the 75-300.... but it's my first new lens since I got the camera. And most importantly probably my first decent lens.
I was looking around ebay for a cheap way to get something better than the kit for the short term. I found a Minolta 25-70mm f/4. At the time I didn't remember it, but later found the thread where Don wanted to do a shootout in that focal range. I did look it up at dyxum, where it has a mid 4's rating,. I figured it was worth it for $25+10 shipping.
It showed up today, and I've been playing with it. My first impression is the difference in build quality (and weight) over the modern cheap Sony lenses. And it's noisy, but I think its the numbers in the distance window. The important part is the pictures seem to have a better feel. The colors seem a little more saturated in the few I took. And the slightly wider aperture is really nice. The focal length is wierd, but if I pick up the Tamron 70-300 and 17-50 in the near future, it will be a nice (although probably not needed) gap filler.
And it turned out to be a crossed XX lens. As far as I know that doesn't mean the optics are better or worse, but it's kinda cool for collection purposes.
So here are a few pictures, and can someone explain to me how the macro function works? I know it only works on manual focus, so I turned the camera to MF, and slid the switch to twist it to the correct position, its how I took the ornament. But both the zoom ring and focus ring seemed to control focus. How is that supposed to be used?
I won't put the huge version in the forum, but it's here.
The camera does not decide ... you do.
Well, every lens has a primo aperture point or "sweet spot." This is invariably a result of lens design and has a lot to do with the way the optic is constructed. Some have it at f/5.6 ... others at f/8! I know that sounds a little extreme, but that's where you will find your best, sharpest focus. Wider apertures tend to soften the focus with the enormous amount of light creeping in from the outer edges of the lens. I suppose you could avoid this with an f/0 optic ... with no light loss (as if) and then the "sweet spot" might be @ f/2.8. ;) Like that's going to happen. Right.
Whatever it is ... even with an expensive optic like the CZ 135mm f/1.8 ... under f/4, there is some degradation to the sharpness of focus. So, we live with it. Most imaging takes place with lighting bright enough to allow operation above f/4, hence many of the low-end lenses start around that aperture (f/3.5, f/4, f/4.5). The first element can be a lot smaller ... and cheaper to make.
In AUTO ... indoors, it is kind of strange to see the camera choose an aperture f/2.8 and a shutter speed of 1/125 sec on the 50mm f/1.4 lens. My personal choice would have been f/4 at 1/60 ... but the SONY program insists on the prior setting, unless I override it. It also (in AUTO mode), depending on the lighting, will drop to 1/20 or 1/15 sec @ f/2. I mean, the camera really uses the base lens aperture it has. The wider the aperture ... the lower the automatic exposure program it goes into it.
So, don't tell me these cameras shoot "smart." They are shooting with an algorithm that slides the settings down until one locks (usually aperture) because of light versus physical limitation and not a calculated "good shot" with excellent focus attributes. What I am saying is: "That's your job, Mr. Photographer." You decide what makes your shot look good, not the camera ... otherwise, you could turn the camera on and effectively hand the thing to any bozo, despite their experience and say, "Here, just press the shutter." and the camera would do all the work for you.
Well, some of the P&S cameras are pursuing this "AI"-type of technology, but when it comes to these DLSRs ... you still have to work at at it. "Boo-yah!"
Reflections on your mind ...
What you are seeing are lens flares and reflections from the camera's sensor, as the light enters the lens, then the camera body, hits the sensor in the back, then reflects back to the back element of the lens you have attached and finally reflects back to the sensor, as another source of light. Annoying, ain't it.
Originally Posted by laydros
The XR-coating of the TAMRON SP AF 17-50mm f/2.8 XR Di-II LD Aspherical (IF) and TAMRON SP AF 28-75mm f/2.8 XR Di LD Aspherical (IF) MACRO does put a cramp in these type of reflections. Film usually did not do this with lenses. The sensors are like mirrors in how they treat light and there you have an example of it.