Search results for 'back focus' - page 1090
Opinions needed on Sigma 400mm F5.6 APO A Manual Focus
Thanks guys He's looking 100 for it but if its not outstanding then I'd never use it (for whatever I was going to use it for :? :D )
Posted by Sean282 on 24/05/2013 - 14:14
Opinions needed on Sigma 400mm F5.6 APO A Manual Focus
There are several versions of the Sigma 400/5.6. See e.g. http://tesselator.gpmod.com/Images/_Equipment_n_Tutorials/SIGMA_400MM_5.6_APO.jpg http://www.dyxum.com/images/Lenses/407/407_1.jpg http://farm5.staticflickr.com/4148/5082965035_1f3e825e04_b.jpg 100 GBP is a good offer, if it is r...
Posted by froeschle on 24/05/2013 - 15:15
55-300 performance
I have just bought a 55-300mm lens and am about to go on holiday - so I too have an interest in how the lens performs. My initial conclusion based upon only a little testing suggests that at 300mm, it is sharper - than the FA 100-300mm f/4.7-5.8 that I also have. I am optimistic about the 55-300mm...
Posted by andrewk on 26/05/2013 - 20:05
55-300 performance
Iso 400 handheld. F5.6 @1/400. Focal length 140mm centre point focus. Pentax k5. This image is the sharpest that I can get with this lensI have just bought a 55-300mm lens and am about to go on holiday - so I too have an interest in how the lens performs. My initial conclusion based upon only a lit...
Posted by mattox on 26/05/2013 - 20:14
55-300 performance
Several of my wildlife (and dog) photos on my small portfolio on here are taken with the 55 -300mm DA at 300mm. I've not had any problems with it other than I often wish it was a 500mm. It behaves better on my K5 since the last software update 1.14. I use spot focusing, centre weighted metering in t...
Posted by wvbarnes on 26/05/2013 - 20:17
55-300 performance
Just checking, take it there was no filter attached? I ask, as mine is superb without a filter, put one on and it is like a different lens. Sorry to ask as I have never used a focus chart, but are they not supposed to be flat on a wall or something, plus was your camera on a tripod?
Posted by AndrewA on 26/05/2013 - 20:19
55-300 performance
Tried taking off the uv filter but there were no obvious changes. If there isn't a problem with front or back focusing then what is causing this softness. Could it be correctly by repair?Just checking, take it there was no filter attached? I ask, as mine is superb without a filter, put one on and...
Posted by mattox on 26/05/2013 - 21:45
55-300 performance
My 55-300 is superb, very sharp at all apertures and all focal lengths. My advice would be to send it back, but also never use your 55-300 with filters. For some reason, this lens hates filters. See Example below, this one at 210mm: Regards David
Posted by davidstorm on 27/05/2013 - 10:27
55-300 performance
One test I did was to cellotape a newspaper page to a wall, making sure it was flat and shoot from a tripod at 90 degrees to it, using the timer. It showed my 55-300 gradually went out of focus from left to right. I got a replacement and that was fine. Regards Jeff
Posted by screwdriver222 on 27/05/2013 - 11:55
55-300 performance
One test I did was to cellotape a newspaper page to a wall, making sure it was flat and shoot from a tripod at 90 degrees to it, using the timer. It showed my 55-300 gradually went out of focus from left to right. I got a replacement and that was fine. My first copy did something similar. Pentax QA ...
Posted by kh1234567890 on 27/05/2013 - 12:20
55-300 performance
I took several with the 55-300mm whilst away in Scotland a couple of weeks back. A tiny village called Camasnacroise near Kingairloch .... Mountains on Rum taken near Sarah's favourite watering hole at Glenuig Bay .... I think the 55-300mm lens is a keeper. :) Andrew
Posted by andrewk on 22/06/2013 - 23:48
Sigma 100-300mm F4 - focusing beyond infinity
Are you sure it's a fault? Most zooms today aren't true zooms, rather they are varifocal lenses - in that you have to adjust the focus when you zoom. A true zoom (parfocal) doesn't do this. It may be that in order to achieve infinity focus at one end of the 'zoom' range, it may take the other end...
Posted by johnha on 27/05/2013 - 18:28
Sigma 100-300mm F4 - focusing beyond infinity
Many lenses focus beyond infinity so it's not really a problem. It's usually long lenses and this is to compensate for dimensional changes with temperature, which can be significant with a huge body of metal and glass. John's reasoning may well also be quite correct.
Posted by johnriley on 27/05/2013 - 18:30
Sigma 100-300mm F4 - focusing beyond infinity
Thanks for all the replies - the main reason for wanting to get this fixed is that when the lens does this, it then takes even longer to get to the point where the focus locks on to the target (which, for me, might be moving very fast!)
Posted by jeallen01 on 27/05/2013 - 20:48
Sigma 100-300mm F4 - focusing beyond infinity
I appreciate the problem, it's one I have on my Sigma 70-300, but it works better in AF-S than AF-C. It seems to have to hit the end-stop before it switches direction. I always wondered whether there's a drawback with the Sigma AF lenses focusing the 'wrong' way to infinity (compared to Pentax). ...
Posted by johnha on 27/05/2013 - 23:33
Sigma 100-300mm F4 - focusing beyond infinity
I appreciate the problem, it's one I have on my Sigma 70-300, but it works better in AF-S than AF-C. It seems to have to hit the end-stop before it switches direction. I always wondered whether there's a drawback with the Sigma AF lenses focusing the 'wrong' way to infinity (compared to Pentax). ...
Posted by jeallen01 on 28/05/2013 - 08:20
Sigma 100-300mm F4 - focusing beyond infinity
The lens got sent back to Sigma Imaging by DHL (that's a long and painful story = "Don't Hurry - and then Lose it"!). When it finally got there, the Technician (Daniel) checked it out and confirmed to me that the focusing beyond infinity is per spec (something to do with something that Canon intr...
Posted by jeallen01 on 12/06/2013 - 15:36
Sigma 100-300mm F4 - focusing beyond infinity
I had a Canon mount Sigma 70-200mm f2.8 that I bought for peanuts as the AF was not working, sent it to Sigma who fixed it (that cost about £130) and I'm not kidding, when it came back it was so sharp it was unbelievable. Would be interested to see what your 100-300mm is like on it's return, mine se...
Posted by Mike-P on 12/06/2013 - 16:10
Sigma 100-300mm F4 - focusing beyond infinity
The lens got sent back to Sigma Imaging by DHL (that's a long and painful story = "Don't Hurry - and then Lose it"!). or Drop it, Hide it, Lose it
Posted by Gamka on 12/06/2013 - 16:34
Sigma 100-300mm F4 - focusing beyond infinity
The lens got sent back to Sigma Imaging by DHL (that's a long and painful story = "Don't Hurry - and then Lose it"!). or Drop it, Hide it, Lose it Even Better! BTW - when I spoke at some length to DHL yesterday, their complaints handler said that they have heard that sort of thing before over ...
Posted by jeallen01 on 12/06/2013 - 16:50
