Search results for 'back focus' - page 970
Opinions on the Sigma 30mm f1.4 please
Great lens, the only alternative below 50mm and f1.4 would be the Samyang/Phoenix/Vivitar 35mm f1.4 but that lens is manual focus only and much bigger. The center sharpness of the Sigma at f1.4 is very good and this is one of those lenses I won't hesitate to use wide open for most of my shots. Ot...
Posted by EricR on 31/05/2011 - 08:21
Opinions on the Sigma 30mm f1.4 please
OK here are my thoughts, the lens is crazy sharp in centre! At f8 the borders/edges are very good - more than acceptable for landscapes. Photozone shows weak resolution/sharpness in the corners, but perhaps the lens' strong contrast gives the impression that its sharper, especially in the corners? ...
Posted by vincechu on 04/06/2011 - 16:11
Opinions on the Sigma 30mm f1.4 please
OK here are my thoughts, the lens is crazy sharp in centre! At f8 the borders/edges are very good - more than acceptable for landscapes. Photozone shows weak resolution/sharpness in the corners, but perhaps the lens' strong contrast gives the impression that its sharper, especially in the corners? ...
Posted by Smeggypants on 12/06/2011 - 00:06
Helios lens - does it work?
I removed few parts, unscrewed few screws, moved few parts, put it all back and it seems to work now, kind of. On the camera, it works occasionally or with a half a second delay, but when detached from the camera it reacts instantly to pressing the pin. Hope it will be ok on my k100d. Thanks for al...
Posted by Pietrach on 31/05/2011 - 07:04
Helios lens - does it work?
I'm not sure whether the Helios lens has an auto/manual switch, but the pin will be irrelevant on digital as DSLRs lack the paddle to press it with. I know with the Takumar lenses you switch to manual and use working aperture metering. Best suggestion I've heard so far was to use the switch in the s...
Posted by Dangermouse on 31/05/2011 - 07:11
Helios lens - does it work?
With an iris pin but no switch you possibly have the least comfortable version to use. I suspect you'll need to go back into the back of the lens and block the movement of the pin. That will allow you to use the diaphragm ring to change apertures. Remember that you'll need to change one or two ...
Posted by Sandehalynch on 01/06/2011 - 14:44
Helios lens - does it work?
Algernon, I have followed your advice now but used the cotton buds - these are hollow inside too and fir perfectly. I took few photos and the quality looks great. The only thing I cannot work out is the strange noise when in M mode i press AE-L button. Does anyone know what this is? It does it only ...
Posted by Pietrach on 01/06/2011 - 20:05
Pentax 18-135mm with K200D a good combination?
I have a K200D and was looking into getting the new Pentax 18-135 to replace my kit lens. Was wondering if anyone has any experience using the lens with a K200D? I have heard that the lens works best with the K5 as the lens correction in camera helps and also the focus speed is very fast with the ...
Posted by Punky on 30/05/2011 - 15:04
Pentax 18-135mm with K200D a good combination?
To throw in a curve ball, the Tamron 18-250 is'nt a bad choice for a lens that offers a heck of range at a very reasonable price. Focus speed is far from sluggish and optically it fares very well considering the range it's packing. Just thought it might be worth mentioning if you do stick with a ...
Posted by Snootchies on 02/06/2011 - 20:34
AF with M42 Lens
using the Pentax AF Adapter, then attaching the M42 adapter on to that, then attaching an M42 lens that has a minimum aperture of 2.8 or les Remember that the 1.7x does not provide full range af, you need to at least manually focus the lens to about the correct area. The aperture of the mains lens ...
Posted by davex on 30/05/2011 - 17:09
AF with M42 Lens
You had it right to start with, for whatever reason Pentax called it an adapter, not a TC. :) works fine with M42 lenses, although see davex's post. The tin foil thing is most likely only to enable catch in focus because the painted base of takumar lenses is non-conductive.
Posted by thoughton on 30/05/2011 - 20:46
AF with M42 Lens
I am confused by this - by af did you mean af confirmation? I may be wrong but whilst using manual focus you can obtain focus confirmation but no lens will autofocus unless it is specifically designed to do so and have the af screw/ af mechanism in the lens etc I am not aware of any m42 lens ...
Posted by Stuey on 31/05/2011 - 12:34
AF with M42 Lens
I may be wrong but whilst using manual focus you can obtain focus confirmation but no lens will autofocus unless it is specifically designed to do so and have the af screw/ af mechanism in the lens etc I am not aware of any m42 lens with this but stand to be corrected. You're wrong, consider your...
Posted by Mannesty on 31/05/2011 - 12:54
AF with M42 Lens
I may be wrong but whilst using manual focus you can obtain focus confirmation but no lens will autofocus unless it is specifically designed to do so and have the af screw/ af mechanism in the lens etc I am not aware of any m42 lens with this but stand to be corrected. You're wrong, consider your...
Posted by Stuey on 01/06/2011 - 12:39
AF with M42 Lens
You set the MF lens to infinity, and then the adapter has it's own lenses inside which move around when you use AF, thus bringing the MF lens' blurry image into focus. For closer objects you might have to prefocus the MF lens to somewhere close to the focus point before pressing the AF button.
Posted by thoughton on 01/06/2011 - 12:44
AF with M42 Lens
You set the MF lens to infinity, and then the adapter has it's own lenses inside which move around when you use AF, thus bringing the MF lens' blurry image into focus. For closer objects you might have to prefocus the MF lens to somewhere close to the focus point before pressing the AF button. Every...
Posted by Stuey on 01/06/2011 - 21:27
Phoenix 28-210mm Lens
Unless the lens has an "A" setting on the aperture ring then you need to go into the DSLR menus and find the custom setting relating to aperture ring. Set this to "allow" (or "permitted", not 100% sure of the exact wording) and you'll be able to fire the shutter with this lens. You also need to look...
Posted by Dangermouse on 30/05/2011 - 22:12
Phoenix 28-210mm Lens
Just one addition to that advice. Assuming your camera works the same way as my K20D, the shutter won't fire if you have the camera body on AF and the image is out of focus. Make sure you have set the camera to MF and it should fire no matter how out of focus it thinks you are. K.
Posted by womble on 31/05/2011 - 01:40
Sigma vs Tamron (Macro)
For portrait the 70mm would indeed be better although i've used the DFA 100 also a lot for portraits you're jst standing further away. One thing though for portraits certainly for childern is that macro lenses aren't fast when it comes to focusing so if focus speed is important i would look further...
Posted by Anvh on 31/05/2011 - 20:15
Sigma vs Tamron (Macro)
I have not used the Sigma 70 2.8 EXDG macro, so can't comment. However, I do own and use the Tamron 90mm 2.8 DI macro, which is a really great lens, If you wan't a fast focussing portrait lens, a macro is best avoided. If you will be using the Sigma or the Tamron for macro work, IMO the Tamron will...
Posted by Fletcher8 on 01/06/2011 - 08:47
