Search results for 'back focus' - page 657
FA 35/2
Hello Oscar and thanks for your input. I think you have a point. Most of my images are shot with a normal prime (50mm analog) and I guess thatīs something that Iīve grown into since way back. I might be old fashion, but I really enjoy the speed and the results of the primes and I seldom use the ...
Posted by matsoberg on 14/11/2006 - 07:31
16-45 vs 24-90
I would prefer a filter on the front to protect the front element... I wouldn't be so sure of that :| I have both the 16-45 and the 24-90. Both had Hoya Pro-1 UV0 slimline filters to "protect" the lens. Managed to drop the 24-90 (*ist-D and lens slipped round my shoulder while kneeling dow...
Posted by MattMatic on 16/11/2006 - 09:26
Old lenses
As George says (by what he's written, and what he hasn't :wink: ) the 50mm is a great lens, and you should get good use from that one. The other two probably won't be quite as nice... However, that's not to say they're not worth trying. The 28mm may well be fine, the zoom may be a bit more vari...
Posted by Daniel Bridge on 16/11/2006 - 18:58
getting ready to buy some new glass
Yes, Tokina and Pentax worked together on the 12-24, the 10-17 fisheye, and the new range of "*" lenses due next spring. There's almost nothing in terms of angle of view, and both are very capable lenses. And yes, there's quite a price difference. However, I bought my 12-24 from Germany...
Posted by MattMatic on 20/11/2006 - 20:47
1.7 x converter with SMC Pentax-A 1:5.6 400mm
Would I be able to use a 1.7 x converter with a 400mm 5.6 A lens, if so would the auto focus work and what F stops would I lose 1 or 2. Has anyone used this combination and if so what sort of results have they had.
Posted by mille19 on 20/11/2006 - 20:41
1.7 x converter with SMC Pentax-A 1:5.6 400mm
The SMC Pentax-A 1:5.6 400mm is manual focus not auto focus. EDIT Aaaargh :oops: , just re read the OP, suppose it would if its the Pentax 1.7x
Posted by McBrian on 20/11/2006 - 22:27
1.7 x converter with SMC Pentax-A 1:5.6 400mm
F5.6 is the minimum rated aperture for the AF system in Pentax bodys, so with the 1.7x AF converter the minimum rated aperture will be something like F3.5. Unlike certain other brands however, the AF circuits in Pentax cameras don't cut out completely beyond that aperture, all that happens is they ...
Posted by Mongoose on 21/11/2006 - 11:32
The shape of the field of focus
Who knows what the geometric section of the area in focus looks like for the majority of lenses out there? Is it a linear section such that all areas of a wall (for instance) will be in focus? Or is it radial such that everything within a specific range from the lens is in focus? Just another...
Posted by kcmadr on 21/11/2006 - 05:57
The shape of the field of focus
The natural plane of focus for a lens is curved, which can be clearly seen in many cheap cameras. As price increases steps are taken to make the focus point fall on the film or CCD at all points, but this will break down at wide apertures and close distances for many modern zooms. Try photographi...
Posted by johnriley on 21/11/2006 - 07:57
Where to buy non-DA autofocus lenses (in the UK)?
I don't know about availbility, but the FA Limited lenses are still in production, and the FA 50mm f/1.4 is still being produced, although it tends to sell out as soon as it hits the stores. If you don't mind manual focus, the A lenses do all the things they're supposed to do, but they are not au...
Posted by Arthur Dent on 22/11/2006 - 03:05
Where to buy non-DA autofocus lenses (in the UK)?
Goodness, Zaphod Beeblebrox and Arthur Dent together in the same thread! 8) Stick with eBay, F and FA lenses do crop up from time to time but don't forget that A series lenses will also provide focus confirmation on the K100D (I don't think M series do though).
Posted by Kimbo on 22/11/2006 - 04:59
Where to buy non-DA autofocus lenses (in the UK)?
Thanks for all the suggestions. To be honest I do prefer the A-series; they just have a much better feel to them and I like focusing manually. The problem is I sometimes find it hard to focus manually on the K100d; it's a tiny viewfinder and I wear glasses, and the diopter adjustment can only do so ...
Posted by ZaphodB on 22/11/2006 - 11:22
Where to buy non-DA autofocus lenses (in the UK)?
M-series IMO are best avoided for digital use. Unless I've being doing it completely wrong, M lenses require you to hold down the shutter release for metering. I find even using M42 lenses with an adapter much easier - just stop down and it meters no problem. Zaphod: Use your heads! :D T...
Posted by Arthur Dent on 22/11/2006 - 14:58
Sigma 135-400mm f/4.5-5.6 DG APO
Hi, Has anybody here used this lens? I have a Samsung GX-1L dSLR and am looking at a big gun lens to replace a 300mm Chinon Mirror and an aging 300mm Paragon. The main emphasis of my photography is in photographing shipping out on the River Humber. I have the 50-200mm kit lens an...
Posted by Trawlerman on 22/11/2006 - 09:16
Sigma 135-400mm f/4.5-5.6 DG APO
........... though Pentax seem reluctant to make super teles. Take a look at the lens road map. Pentax concentrated rightly on first making new digitally optimised lenses at the wide and middle parts of the focal length spectrum, and next year will be tackling the long end with a new 300mm (450mm e...
Posted by George Lazarette on 22/11/2006 - 11:05
Sigma 135-400mm f/4.5-5.6 DG APO
ah the K10D...... i'd love to have one in my outfit but having just gotten a GX-1L back in September I don't think I can justify getting another new body just yet. Especially as I have just this month finished paying it off my credit card. I do intend getting a good Manfrotto Tripod and Head...
Posted by Trawlerman on 23/11/2006 - 20:49
Wide angle
Whatever the Sigma is like optically, in terms of physical design I'd much prefer one of the Pentax DA lenses. Even on the cheap 18-55mm (the one I have), there's the quick-shift focus that lets you focus manually while in AF mode (works very well) and the little tab that can be removed from the len...
Posted by ZaphodB on 23/11/2006 - 22:54
pentax 16-45 vs. Sigma 17-70
[edit] I just found another site that the 16-50 will be a new DA* lens with USM motor, it looks the same as the Tokina lens... Will these USM lenses work on the older bodies? Or are they exclusively for the K10D and upwards? [/edit] I'm guessing its another Pentax/Tokina joint project. I am also in...
Posted by Mongoose on 23/11/2006 - 23:54
pentax 16-45 vs. Sigma 17-70
First, power zoom has not been fully resurrected. The power contacts are there for the new lenses, and the old PZ lenses can tap the power for the zoom motor, but the K10D body provides no functionality. Second, it will be very interesting to see what Pentax do about backwards compatibility for...
Posted by George Lazarette on 24/11/2006 - 09:59
pentax 16-45 vs. Sigma 17-70
Just came back from the store with a 16-45 and the 50-200. Sadly they didn't have the sigma on stock with a Pentax mount, so I couldn't judge the optical quality. I made my decision on the feel of the two units. The Pentax is quite a bit lighter and I must say that the DS feels good with the 16-45...
Posted by golfdiesel on 16/12/2006 - 13:48
