Search results for 'back focus' - page 1044
Sigma Macro lenses - 50mm vs 105mm
I am in the process of upgrading my 70-300mm Tamron lens with a Pentax 55-300 DA :D. I know that for telephoto the Pentax is a good upgrade on the Tamron, but the Tamron also has a useful macro function. I have been looking at Sigma macro lenses, and have found examples of both the 50mm and 105mm...
Posted by AndrewH on 04/05/2012 - 21:02
Sigma Macro lenses - 50mm vs 105mm
^^^^ liking the above ^^^^ Don't forget the 90mm too from Tamron. (and old ones from Sigma). You will probably be manual focusing when really close so autofocus is not a must. Have a look at . She uses a stealthy creeping technique. The Cosina/Vivitar/Pentax 100mm f3.5 is cheap cheer...
Posted by dougf8 on 04/05/2012 - 22:04
Sigma Macro lenses - 50mm vs 105mm
I have an older manual focus version of the 50mm and it is great. I take Mike's point about the working distance with insects, but I don't find this to be a problem at all and have taken a lot of good shots of bugs with this lens. It also seems pretty good when teamed up with a teleconverter - I u...
Posted by davidstorm on 04/05/2012 - 22:08
Sigma Macro lenses - 50mm vs 105mm
I don't usually find a 50mm working length a problem when doing macros, even when I add tubes, but there is little doubt that being able to close focus when further away would be a benefit. I often find myself pursuing something into a corner or tight spot and sometimes can't get the 50mm close e...
Posted by milamber on 04/05/2012 - 22:11
Sigma Macro lenses - 50mm vs 105mm
I often find myself pursuing something into a corner or tight spot and sometimes can't get the 50mm close enough into the small space to focus. That's a good point and probably one reason why the longer focal lengths are more popular. Regards David
Posted by davidstorm on 04/05/2012 - 22:15
Sigma Macro lenses - 50mm vs 105mm
Just as an additional thought. As you have the M 50mm anyway it might be worth getting a set of decent auto extension tubes which will cost around £15, perhaps less if you keep your eye on Ebay or a 2x macro converter which will cost around £40. It might be more challenging than the Sigma 105m...
Posted by milamber on 04/05/2012 - 22:37
Sigma Macro lenses - 50mm vs 105mm
If you are considering the tripod for macro work then you might want to just think twice before you splash out. I bought one primarily for use with macro, but it's more or less impossible to use it for insects unless you have heaps of patience standing in one spot. If, like me, you are going to b...
Posted by milamber on 05/05/2012 - 08:45
Sigma Macro lenses - 50mm vs 105mm
When I had the Sigma I did a quick comp of it vs the MF Vivitar 55mm and a good prime with tubes and an achromatic +5 close up filter (not cheap). If you want to chase insects then the longer the focal length will be better, if you have mainly static subjects you can achieve nearly (maybe better it...
Posted by dougf8 on 05/05/2012 - 09:48
Sigma Macro lenses - 50mm vs 105mm
Hi Andrew I have the sigma 50mm f2.8 EX DG Macro :D I use this quite a lot as a walk around lens as well but it can be a bit long for this use sometimes but nice for happening upon the odd unexpected macro opportunity :D. As for insects the extra reach of the 90, 100 and 105mm lenses will...
Posted by Stuey on 05/05/2012 - 12:46
Sigma Macro lenses - 50mm vs 105mm
I have the 50mm F2.8 Sigma, you do have to get very close for 1:1 BUT it works every distance in between too and shows you the ratio on the extending barrel. It's a fabulous and quite fast bargain as a portrait lens too. If I have the money I may get the 70 and 105mm versions in the future. I sad...
Posted by wvbarnes on 05/05/2012 - 13:09
DA 15mm F4 or FA 31mm F1.8?
Thank you all folks for your very useful comments. I must admit I was expecting a sort of 'either this or that lens' debate. That probably reflects my 'novice enthusiast' status as opposed to veterans Pentaxians! To Fletcher: your idea of renting either lens from SRS is very sensible and I might j...
Posted by major on 07/05/2012 - 14:03
DA 15mm F4 or FA 31mm F1.8?
How many DA-Ltd's can you get for the price of a FA31-Ltd and the sale of of the 17-70? Just planting seeds... A nice full-prime set-up with the DA18-135 as your WR and travel-zoom back-up... Again... Just planting seeds...
Posted by DaveHolmes on 08/05/2012 - 15:24
Lens pins
Tried self repair but lost one of them and when i realized it was too late. I just vacuumed :) I mean the gold metal things on the bayonet of the lens that transfer information to the camera about f-stop and focus. Now the lens has AF, but the aperture information is not transferred correctly.
Posted by amplified on 11/05/2012 - 10:46
Sigma 180mm F2.8 macro
Ideally I would recommend a set which permits full communication with the lens. But I've not seen a set for a little while, and they tend to be about £140, but they do support all modes and metering. Note I deliberately short out the Data pin to fool the K-5 into thinking that any lens attache...
Posted by Col K10 on 11/05/2012 - 23:46
Sigma 180mm F2.8 macro
Ay least the Pentax 1.4x-S lets you set the focal length, even though it's manual focus. Most TC's fix it at 300mm or whatever. The Kenko 1.5x TC's seem OK with the 55-300mm as well.
Posted by Algernon on 12/05/2012 - 10:28
pentax kx compatible problem
I`m new to dslr so please forgive the question. Bought a Pentax ozeck 80-200mm lense from ebay. The lense fitted okay and could focus via the view finder. But the camera seems to fail to recognise the lense. It doesnt show any f numbers and fails to take a picture. Sorry the description is so...
Posted by nilsac on 12/05/2012 - 22:34
Lens and lens mounts
Hi, Try the following :- http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p5197.m570.l1313&_nkw=m42+to+pk&_sacat=See-All-Categories http://www.ebay.co.uk/sch/i.html?_nkw=m42+to+olympus&_sacat=0&_odkw=m42+to+pk&_osacat=0&_trksid=p3286.c0.m270.l1313 Can't comment on using M42 lenses on...
Posted by Frogherder on 14/05/2012 - 16:21
Lens and lens mounts
It's a complex issue that depends not only on fitting the lens, but also on the back-focus distance to the sensor. Not all lenses can be fitted to all cameras. When they can, sometimes they don't focus to infinity and sometimes they are not easy to use. SRB-Griturn are the experts on what is poss...
Posted by johnriley on 18/05/2012 - 23:59
Lens and lens mounts
The rear focus distance for OM lenses is 46mm, (about 1/2mm more than the PK mount) so if the mount fits inside the PK body an adapter would be possible, I do't think it does - but I've never tried. For macro work you can get adapters to allow the use of just about any lens on any SLR (with a bel...
Posted by petrochemist on 19/05/2012 - 09:13
One "all-in-one" lens for beginner
My advice for a novice is to buy a 50mm and nothing else. You will learn more about photography with a single fixed-focus lens. It will teach you how to 'find' a photograph by walking around a subject rather than standing in the same spot and zooming in. I'm not saying that zooms are bad, but I...
Posted by greynolds999 on 14/05/2012 - 13:08
