Search results for 'back focus' - page 1137
Tair 3a 300mm f/4.5 soviet rocket launcher shoots bus stops
I've just retried the shot with the A 400mm f5.6, at f11 on a tripod. Not so easy to focus on the tripod either (must stand it on paving slabs next time, rather than on a lawn). Having said that, definitely a bit better. Andrew
Posted by andrewk on 22/04/2019 - 15:58
Tair 3a 300mm f/4.5 soviet rocket launcher shoots bus stops
That's much better. Quite acceptable from a 400mm lens. The RHS of the board looks more infocus than the left. Manual Focus with a long lens is always difficult. The Sigma's with inbuilt SR are a bit easier or use a 2X Refconverter. It's a pity that Pentax never improved the electronic indica...
Posted by Algernon on 24/04/2019 - 10:41
New Pentax WR 100mm macro and 1.4 converter
Not been on Forum for a while, but a few months back, Pentax User sent out bulletin with review of new WR 100mm macro and then two weeks later of 1.4 converter. Has anyone managed to get hold of either or combo and if so what do you think?
Posted by Macrofan on 20/06/2014 - 23:50
Sigma 105 Macro
At least a year back! In April 2013 after much searching I found (in Eire) what was possibly the last new Pentax fit 105 on the planet.:D Optically the DFA 100 macro is every bit as good as the Sigma - but who wants a fully automatic macro lens?
Posted by cbrog on 25/06/2014 - 10:31
Sigma 105 Macro
that is a real shame. "Optically the DFA 100 macro is every bit as good as the Sigma - but who wants a fully automatic macro lens?" exactly, the ability to switch to manual and use catch in focus is a great advantage of the Sigma over the Pentax.
Posted by redbusa99 on 25/06/2014 - 13:08
Sigma 105 Macro
"Optically the DFA 100 macro is every bit as good as the Sigma - but who wants a fully automatic macro lens?" Just add a short extension tube with contacts between the camera body and lens to give full manual control and catch in focus, OK you lose focus to infinity but how many times do your need t...
Posted by McBrian on 25/06/2014 - 13:42
Sigma 105 Macro
that is a real shame. "Optically the DFA 100 macro is every bit as good as the Sigma - but who wants a fully automatic macro lens?" exactly, the ability to switch to manual and use catch in focus is a great advantage of the Sigma over the Pentax. Sorry, I haven't used the Sigma 105 on Pentax,...
Posted by McGregNi on 25/06/2014 - 20:38
Sigma 105 Macro
All of the manuals back to the K20 are quite specific on this point; 'Catch in focus' only works using a manual lens or a DA or FA lens that has a AF & a MF setting on the lens which must be set to MF before setting camera to AFS and shooting....The Sigma 105 has such a switch, my Sigma 50mm macro ...
Posted by cbrog on 25/06/2014 - 21:35
Why bother?
I think because a lot of photographers, self included, are old and spent years using mainly 35mm film cameras and their different focal length lenses. With the advent of digital, there were, and indeed are, so many different sensor sizes that in order to make sense of what one might see looking thro...
Posted by bwlchmawr on 28/06/2014 - 06:53
Why bother?
Well, the first thing I want to say, This time I am not trying to sell the advantages or disadvantages of the FF format. bwlchmawr wrote: I think because a lot of photographers, self included, are old and spent years using mainly 35mm film cameras and their different focal length lenses. With ...
Posted by Horst on 28/06/2014 - 08:18
Why bother?
K10D wrote: The pubs in Perth sell pints but charge in Fahrenheit figures as they are numerically larger, especially that 100/212 version where a 100% of cost outside of Australia means 212% in Perth. This is only because you are all rich in WA. Then he wrote: To Mark: I still use FF K-mou...
Posted by Horst on 30/06/2014 - 06:27
Why bother?
A similar argument has gone on for years about whether shoes should be marked L & R :shock: Me I enjoy working it all out myself as I'm sobering up :mrgreen: :wink: -- I've seen wellies and seaboots marked L and R a hark back to the days when a lot of jolly jack tars were thick. :D Wasn't the...
Posted by tyronet2000 on 02/07/2014 - 16:32
Why bother?
For most Pentax owners I can't imagine there will be an issue as to whether the lens is a "full-Frame" or a "cropped" version, as they are extremely unlikely to bother buying a "full-Frame" camera due to the expected price. if and when it arrives. There is as much chance of them selling up and purc...
Posted by andy_bell on 04/07/2014 - 08:33
Why bother?
Getting back to the Leica argument, two photojournalists I know use both the Leica M9 and the Fuji X-Pro1. Both say that the APSC size Fuji blows the FF Leica out of the water. I'm hopeful that the FF notion will eventually go away as sensor technology develops. However it wouldn't surprise me at al...
Posted by gartmore on 17/07/2014 - 19:03
Why bother?
An adapter wouldn't need an extension tube, it would still use the K mount, so no adapter would be needed. The K mount is a full frame mount already. Lenses are made to cover an image circle of a particular size, so most existing lenses won't cover the full area of FF. Some will, depending on the...
Posted by johnriley on 18/07/2014 - 11:26
Why bother?
[b] you then crop it to the 16Mpl area and you have exactly the same image with the same quality as your APS-C camera. Not necessarily. Assuming that the AF point is the same size on each sensor then, it can be more accurately set on APS-C. So you might have the eye in focus with the crop and o...
Posted by Blythman on 20/07/2014 - 00:18
Why bother?
Blythman wrote: Assuming that the AF point is the same size on each sensor then, it can be more accurately set on APS-C. So you might have the eye in focus with the crop and out of focus with the FF as on FF it covers a larger area of the animal Hello Alan. Focus is only 2 dimensional, forget d...
Posted by Horst on 20/07/2014 - 01:04
Why bother?
I don't see it as being sensor related, rather its solely about lens focal length and the resulting perspective effects of different lengths ... These two factors are exactly the same on both formats. Andrew and his friend standing together shooting the same thing each with a 300mm lens will record ...
Posted by McGregNi on 20/07/2014 - 08:39
Why bother?
I think the 'problem' arises from a human factor, not technological. We have a human need to 'fill the frame', that's been ingrained as a human best practice. In fact the only requirement is to select the right focal length to get the magnification needed .. This depends solely on how far away we ar...
Posted by McGregNi on 20/07/2014 - 09:47
Why bother?
Blythman wrote: Assuming that the AF point is the same size on each sensor then, it can be more accurately set on APS-C. So you might have the eye in focus with the crop and out of focus with the FF as on FF it covers a larger area of the animal Hello Alan. Focus is only 2 dimensional, forget d...
Posted by Blythman on 20/07/2014 - 10:31
