Search results for 'back focus' - page 978
Some new lenses
Back to the reviews issue. If you select something from the drop-down box to limit the reviews you see, you do not get what you expect. Thus, if you select 'all' you get nothing, and if you select 'lenses' you get only one of the two lens reviews. K.
Posted by womble on 05/07/2011 - 19:15
Some new lenses
The 43mm Ltd is the only Ltd I've got. I bought it back in the film days and it's a superb lens. I've only used it a few times on digital, mostly because I prefer zooms. It does perform well on digital. I'm surprised the MTF test shows the edges lagging so far behind the centres? The corners ...
Posted by Algernon on 06/07/2011 - 11:00
Some new lenses
Without getting back to the same discussion as before, which, by the way, may well be an effect of spherical aberration due to de-centreing, the MTF results are what they are. Very often, lenses gain reputations but the lab results may or may not show something extraordinary. At the end of the da...
Posted by johnriley on 06/07/2011 - 11:12
Some new lenses
I usually find when testing by photographing banknotes etc. 3 shots of every 4 are often out at say f/2. The sharpest is often the one with the biggest file size :shock: MF is usually the most reliable. I've never tried live view. I do use a 2x Refconverter though. The Eye-Fi card also comes in ...
Posted by Don on 06/07/2011 - 11:58
Some new lenses
The 'signature' as I think it's often referred to, the very individuality that allows one to choose a lens as a painter might choose a brush - hog, squirrel, or sable. Now that is an image that shows the FA43 look. Here's another from a while back.
Posted by rparmar on 07/07/2011 - 01:32
Some new lenses
Pentax themselves have said that we're at the limit of where these Limited lenses can perform Is that just from a comment Ned made on his blog? Or is there another source? In any case your own tests demonstrate this is not true. The FA77 out-performs the DA70, the FA31 has better figures than the...
Posted by rparmar on 07/07/2011 - 13:25
Telephoto Lens advice please ?
I guess its like buying the right car, apart from obvious budget questions what will you be using the lens for?(mostly). Maybe you dont need 500mm? Are size and weight factors for you? Focus speed/silent focussing? Some things to think about:) Dan
Posted by DanielH on 27/06/2011 - 10:45
Telephoto Lens advice please ?
Sigma 100-300 are very rare to find for Pentax now. As rare as hens teeth, when they do come up expect to pay at least £900. But also expect to wait a long time. Sigma 150-500mm f/5-6.3 DG OS HSM A lot of very satisfied users on this forum, including me. Beware the AF is a bit slow and can hunt...
Posted by davex on 27/06/2011 - 11:30
Telephoto Lens advice please ?
Really need to know what you are going to use it for. Do you need the zoom range (since you initially chose the 100-300/4) ? If so then the 60-250 is a very nice lense indeed and an able substitute, though AF is not lightening fast. Don't really need a zoom, or rarely 500, and the lense will mai...
Posted by Frogfish on 27/06/2011 - 12:55
Telephoto Lens advice please ?
Used most of these lenses at a meet yesterday. I had the Sigma 100-300 of my uncle and tested it against the DA8200, DA*300 and the DA*60-250. The Sigma was the fattest to focus and the two primes where also actually quite decent in that aspect, the DA*60-250 was rather slow certainly compared to ...
Posted by Anvh on 27/06/2011 - 13:31
Telephoto Lens advice please ?
The cheaper 70-300mm lenses with a tcon are not really a good idea - apart from being too slow to af properly, if at all, there's a big liklihood of purple fringing [the Tamron has always been known for it]. The problem with Sigma HSM lenses is the lack of a Sigma tcon that will af with them. The 55...
Posted by greypoint on 27/06/2011 - 14:28
Telephoto Lens advice please ?
Used most of these lenses at a meet yesterday. I had the Sigma 100-300 of my uncle and tested it against the DA8200, DA*300 and the DA*60-250. The Sigma was the fattest to focus and the two primes where also actually quite decent in that aspect, the DA*60-250 was rather slow certainly compared to ...
Posted by karthikv82 on 27/06/2011 - 14:29
Telephoto Lens advice please ?
i use a 150/500 sigma - its a great lens - slowish on auto focus but use it to get a few good shots - manual option too.... it is a bit heavy to carry! paul
Posted by snowpaul on 29/06/2011 - 17:31
Testing out the newly purchased AFA 1.7 teleconverter at Houston Zoo
I took the plunge and splashed out on the AFA 1.7 Teleconverter. I found one of eBay, but it was expensive! My reasoning is that because i have just bought the Sigma 70-200 OS f2.8 (which is a great lens, i have had a few problems with Sigma lens but this one is a beauty). This covers the 200mm f2.8...
Posted by pudser on 27/06/2011 - 11:11
Pentax FA 100mm Macro Lens
Hi everyone just purchased the above lens as my 1st macro lens after reading all the good reviews about it. being my 1st i'm not sure if it is focusing correctly. When i manaul focus it it seems to only focus dead centre regardless of what focus points are set, ie centre or 11 point. and if moved...
Posted by richardhurst on 27/06/2011 - 18:20
Pentax FA 100mm Macro Lens
When you focus, either with AF or MF, you are looking through the lens at full aperture. Especially at close distances this means very little depth of field. This aids the focusing process. When you take the picture, the lens stops down to the selected aperture. Thus you will then have more DOF. ...
Posted by johnriley on 27/06/2011 - 19:01
Pentax FA 100mm Macro Lens
John, How do you focus one third of the way into a scene?
Posted by col55555ine on 27/06/2011 - 19:08
Pentax FA 100mm Macro Lens
John, How do you focus one third of the way into a scene? You can actually forget that because it's wrong. The focus does not always extend 2/3th to the back and 1/3th to the front. With 1:1 magnification so macro it's actually very close to 1/2 and 1/2 and when you focus near the horizon it can ...
Posted by Anvh on 27/06/2011 - 19:36
Pentax FA 100mm Macro Lens
When you focus, either with AF or MF, you are looking through the lens at full aperture. Especially at close distances this means very little depth of field. This aids the focusing process. When you take the picture, the lens stops down to the selected aperture. Thus you will then have more DOF ....
Posted by GlynM on 27/06/2011 - 19:53
Pentax FA 100mm Macro Lens
Focusing one third of the way into a scene is a "rule of thumb" that will in most cases secure the maximum DOF without recourse to tables or scales. This is useful in practice. You focus one third of the way in by deciding where your closest focusing point should be and where the furthest shou...
Posted by johnriley on 27/06/2011 - 21:06
