Search results for 'back focus' - page 1215
Third party lenses
I guess its second hand or new irix then. just looked at their 150mm macro and its impressive. It is a macro lens i'm looking for specifically. I think even if the others still made lenses I would still go for the Irix ... it looks excellent and there is a thread all about it on Pentaxforums. Rememb...
Posted by Lubbyman on 18/05/2020 - 21:42
Third party lenses
I have always had excellent results from the Pentax M and A series 100mm macro The FA and F versions are equally good if you are desperate for AF. There is simply no need to buy expensive new ones. If you drop back slightly to 90mm you can have the universally acclaimed Tamron offering for £100 - 15...
Posted by davidwozhere on 19/05/2020 - 00:57
New f1.4 85mm* lens
I feel it is the way the market is going as the pace of digital innovation slows more attention has moved to creating lenses of previously unknown optical quality. When the DA*11-18mm was released at what was it £1400 or £1500 I thought "That's me out". I've already got the Sigma 10-20mm which is a ...
Posted by Nigelk on 25/05/2020 - 12:15
New f1.4 85mm* lens
I begin to worry about the new APS-C camera, if I remember correctly the K-3II and the KP were originally around the £1300 mark when new so if they start thinking 2K then Pentaxfolk are going to get a big shock. The *istD originally came out at £1200-1300 IIRC, with an FA-J 18-35mm lens. The only c...
Posted by ilovesaabs on 28/05/2020 - 10:24
DFA*f2.8 70-200mm
Has anyone else seen the latest YouTube from Cameraville? Not for the first time he rips into this lens for focus breathing and inaccuracy at 200mm claiming it is more akin to 135mm, also lacking sharpness compared to a similar Tamron lens. He claims to have had four copies so his experience isn’t o...
Posted by RobL on 01/06/2020 - 18:32
DFA*f2.8 70-200mm
What I would like to see is a comparison against the Tamron 70-200. And what we actually get for double the price ? Never been convinced its a lot but name... Wasn't there one when the lens was first released? Look around, I'm very sure there may have been one on PF. Edit: I also wanted t...
Posted by HarisF1 on 01/06/2020 - 21:42
DFA*f2.8 70-200mm
Apart from the annoying presenting style the content is rubbish. 1. He is using unprocessed raw files as a comparison. 2. the focus point in the two comparisons are not the same. 3. if he has tried 4 copies and gets the same results then clearly the camera is in need of AF/FA calibration. ...
Posted by pschlute on 01/06/2020 - 23:10
DFA*f2.8 70-200mm
Nikkor 70-200/2.8 VR2 also focus-breathes - never bothered me. Not had the opportunity to use my D-FA* determinedly yet thanks to lockdown, but I won't let these 'experts' ruin my enjoyment of the lens.
Posted by ilovesaabs on 02/06/2020 - 10:13
DFA*f2.8 70-200mm
There's some great ideas being mulled over in this thread, although like everything else it all takes time and somebody has to do lots of work to make things happen. One thing that I do think is that the lens in question is definitely worth buying and if the buyer didn't like the copy they receiv...
Posted by johnriley on 03/06/2020 - 12:11
DFA*f2.8 70-200mm
I have had the DFA 70-200mm f/2.8 for about 12 months now and have to agree with him up to a point. Having had the Canon MKII version I would say the Pentax (Ricoh?) lens is lacking in contrast slightly and it's certainly not as sharp as the Canon wide open. Having said that it's all easily recti...
Posted by Mike-P on 04/06/2020 - 09:45
DFA*f2.8 70-200mm
Well Cameraville has just done his last Pentax video. Interesting concept, use Pentax and its loyal users to gain enough visibility to gain momentum and hits, then shift to Sony or others. Hmm More comebacks than................. John Wow, he doesn't like the 70-200 :) , I stopped when h...
Posted by robbiec on 10/06/2020 - 14:04
Terminology - Focus Breathing
The [link=https://www.pentaxuser.com/forum/topic/dfa-f2-8-70-200mm-63792 ]thread on the DFA 70-200[/link] refers to "Focus Breathing". - What is this please, and - what effects, if any, might it have on usability and photograph quality?
Posted by kea828 on 02/06/2020 - 18:10
Terminology - Focus Breathing
I'm going to have a go at this. I think if you for example have the lens set at 200mm on a distant subject the lens does indeed give you the 200mm magnification that is claimed for the lens however if you then focus on a close subject with the lens still set at 200mm it gives you a lower level of m...
Posted by Nigelk on 02/06/2020 - 18:34
Terminology - Focus Breathing
Yes Nigel, and difference can be surprising. Several years ago I observed this using a 135 prime and the 18-135 zoom set at 135. For a distant scene the angle of view for both was similar, but for a subject at about 5 feet, the zoom at 135 gave a FoV more like a 90 mm lens. Philip
Posted by MrB on 02/06/2020 - 19:17
Terminology - Focus Breathing
The Pentax 60-250 is known for this. At closest focus distance the FL is more like 190mm. This effect happens to most zooms and is quite normal.
Posted by pschlute on 02/06/2020 - 21:45
Terminology - Focus Breathing
I've never looked for this phenomenon but those variations are much greater than I would have imagined.
Posted by Nigelk on 02/06/2020 - 22:36
Terminology - Focus Breathing
From what I understand, it occurs more strongly on internal focus lenses as a bit of a necessary compromise. I'm sure that Physics would allow for internal focusing lenses that also don't have focus breathing but this would probably require additional complexity in the lens design.
Posted by HarisF1 on 02/06/2020 - 23:02
Terminology - Focus Breathing
Gets a bit more fun in video too, where you change the focal point in the scene and suddenly the field of view is changing as well. Similar fun when you want to zoom in or out, but that changes the focus point in non parfocal lenses. Video tends to highlight flaws you can usually gloss over or a...
Posted by richandfleur on 03/06/2020 - 01:16
Terminology - Focus Breathing
I suppose if the angle of view widen as the lens breathes it is less of a problem if you are critically framing something rather than having to recompose and focus constantly if your composition is significantly cropped. Probably explains why this phenomenon hasn't really bothered me much. As a ...
Posted by ilovesaabs on 03/06/2020 - 11:38
Zoom Lenses
I love the 150-400, it is a superb tool for the price; I am using a more expensive Nikon Tele zoom on my D500 which is super (on the D500). However, if the new Pentax APSC body coming out this year can focus and track anything like the Nikon D500 then I will die a happy man and sell the Nikon...
Posted by Daronl on 12/06/2020 - 19:31
