Search results for 'back focus' - page 809
Da 35mm vs DA 40mm
Thanks for the replies, folks. Yes, it was those deals on Amazon that first caught my interest. I will probably press the button over the next few days, and if so I'll report back. My guess is that if one can acquire a 40mm f2.8 for just over 200 squids it is pretty hard to resist because even if it...
Posted by mecrox on 12/09/2009 - 21:55
Old SMC M lenses
I use the SMC K 1.8/55 a lot. And have the Vivitar (made by Komine) 2.8/28 close-focus K-mount coming to me in a few days, I hope. The latter being arguably one of the best 28 primes, ever made. I love those old lenses. And will use them as much as possible. They produce a certain 3-D look o...
Posted by Malo1961 on 12/09/2009 - 22:48
Old SMC M lenses
Just a little off topic But I have an A version of the 200mm f4 in mint condition, What do you reckon its worth, I have never seen another to compare it with. I also have an A version of the 100mm f2.8 Just curious Worth? Lots!!!:D Back to the OP, don't be conned by the 'rare' 40mm. They're...
Posted by Hardgravity on 13/09/2009 - 07:31
DA40 Ltd vs fast zooms
Adrian I've had the opposite experience. At first, I wasn't too sure of the 40mm's usefulness. However, on a recent holiday I used a Tamron 18-200mm a lot of the time, but also just went out with the 40mm when I needed to travel "light". I found the pictures from the 40mm much better, not just...
Posted by TonyM on 13/09/2009 - 20:34
DA40 Ltd vs fast zooms
Adrian I've had the opposite experience. At first, I wasn't too sure of the 40mm's usefulness. However, on a recent holiday I used a Tamron 18-200mm a lot of the time, but also just went out with the 40mm when I needed to travel "light". I found the pictures from the 40mm much better, not just...
Posted by bychan on 23/09/2009 - 16:05
My Bigma - RIP :-(
There was a private Red Arrows display this afternoon (Birthday party) for the chap that broke the steam speed record in America a few weeks ago and he happens to live just a few miles from me so took a trip down armed with my trusty Bigma. I have been having a few problems with it lately, the focus...
Posted by Mike-P on 13/09/2009 - 18:06
My Bigma - RIP :-(
Hi Mike, check the manual focus ring that it is not stuck between auto and manual this happened to me when I was in Fuengirola Zoo, moved it back and foreword a few times take the lens off and put it back on again and all was OK, also give all the contacts lens and camera a clean, other than that I ...
Posted by jackitec on 13/09/2009 - 18:16
My Bigma - RIP :-(
Allready checked the focus ring, lens lock and contacts with no joy. Looks like its off to Sigma for a service, lucky it was cheap when I bought it used. No hurry as the sun is fading in the UK now (did I say now?) and its really only a good light lens.
Posted by Mike-P on 13/09/2009 - 21:10
Rikenon 300mm f4.5 APO
It does show some severe PF. Look at the front and back wheel, the saddle and the handlebar pin. And this is at F8 ? I wonder how this develops used wide open.:shock: On the other hand.....for the money and age considering, you have a nice piece of glass. Do avoid high contrast scenes though.:win...
Posted by Malo1961 on 15/09/2009 - 18:05
Rikenon 300mm f4.5 APO
I took a few more photos this morning, with the Rikenon on a tripod - with and without a Hoya Skylight filter - and also with/without a XR Rikenon 2X converter. I also took some with a 1960's Tamron 400mm f7.5 T2 lens that I acquired for about £20 a while back. The shots were focussed on the tra...
Posted by andrewk on 16/09/2009 - 14:48
Pentax 70mm f2,4 Limited
I'm not 100% convinced at this sudden attention to such as vague term as "bokeh", but it only really refers to the pleasantness (or otherwise) of out of focus areas. It's probably dependent on the number of diaphragm leaves as much as the computation of the lens. The 70mm f2.4 is quite long enoug...
Posted by johnriley on 14/09/2009 - 09:46
Pentax 70mm f2,4 Limited
Not entirely sure what you mean here. If you mean that your depth of field will be greater because it is f/2.4 then that if offset by the longer focal length. The rendering of the out of focus highlights is the result of many different factors including the number of blades in the aperture. K
Posted by womble on 14/09/2009 - 09:47
Pentax 70mm f2,4 Limited
The 70 is DA and hence for the APS sensor - no? It is al the Amazon guy said and is a delightful lens. I will try and take a portrait tomorrow but for now the back of a nice lady's head will have to suffice at f4 in very, very bright sunlight. Not proud of this so no harsh words. The orig...
Posted by mikew on 14/09/2009 - 22:23
Pentax 70mm f2,4 Limited
Just one stop makes all the difference to DOF, and also makes it easier to focus in low light. I believe the 70mm is a pretty good lens, and good value for the price. But its small size has led to compromises that I would rather not make. G
Posted by George Lazarette on 15/09/2009 - 21:57
Pentax 70mm f2,4 Limited
Quickness = speed to focus? If so I find the 70 pretty good. Not the very best, for example not as good as the 35mm f2 but still good. I wouldn't think you would find it a limiting factor. Mike
Posted by mikew on 17/09/2009 - 19:58
Pentax 70mm f2,4 Limited
In the interests of scientific truth, I put my 77mm onto a K10D and then a K20D to compare the focus speeds. Scientific truth was ill-served by my tests, which were rough and ready in the extreme. It did seem that the K20D was fractionally faster, but that might have been more to do with the tes...
Posted by George Lazarette on 17/09/2009 - 22:26
Sigma lens to fit Pentax
A general question on old Sigma lenses. I have the offer of an old one and as yet am waiting for some more details on the lens. I have not found any information on my searches yet but wonder what I need to look for to understand if anything can be done to use the lens on my K10D or MX. All I know so...
Posted by bigcog on 16/09/2009 - 15:28
Pentax SMC A 50 mm Lens usage
George has a good point. If you are using an A lens, this will mean that the exposure will be done in camera, but the focus will be done by you. Are you relying on the focus beep in the camera to confirm the area is in focus? If you are only the centre point of the image will be in focus (unlike...
Posted by Offertonhatter on 16/09/2009 - 20:58
Pentax SMC A 50 mm Lens usage
You are aware of course that it's a manual-focus lens? Pentax-A lenses have a DOF scale round the ring with the yellow blob. For any particular aperture, this shows what will be in focus. I don't know why your exposures are not spot-on, but one possibility (as this is an old lens), is that th...
Posted by George Lazarette on 16/09/2009 - 21:02
Pentax SMC A 50 mm Lens usage
With MF lenses, the only accurate indication you have that an object is in focus is the green hexagon in the viewfinder. Neither the beep or the presence of the red focus indicator in the viewfinder should be relied upon to indicate correct focus, because they don't. The beep simply means that a pa...
Posted by Mannesty on 16/09/2009 - 21:17
