Search results for 'back focus' - page 990
adapter ring for MEsuper
I don't think you'll be able to find an adapter for these, sad to say. The problem is that the lens needs to be at a specific distance from the film plane in order for it to focus properly. Generally an adapter would move the lens further away, meaning you'd lose infinity focus and be unable to f...
Posted by Dangermouse on 05/08/2011 - 17:05
Samyang/Falcon 500mm f8 preset lens
From the reviews I managed to find, the preset lens outperforms the mirror lens by quite a margin. That's the main reason I was interested in it. Here's a to a discussion of the preset lens with some pics, a few of which look very sharp. However, it does have a minimum focus distance of 30 feet.
Posted by aliengrove on 07/08/2011 - 00:36
Silly question again - sorry
A is manual focus and F is the first generation of autofocus. The aperture of both can be controlled from the body of a DSLR. John
Posted by johnwhit on 05/08/2011 - 19:21
Silly question again - sorry
Is that Cobalt Naptherwotzit what makes it auto focus then?
Posted by doingthebobs on 06/08/2011 - 22:21
Pentax-M 28mm f3.5 SMC
From experience it's very close behind the original SMC Pentax 28mm f3.5 - the older lens is sharper at f3.5 but they're even by f8. When I used mine on digital I tended to leave it set to f8 and infinity, then just meter and shoot. Due to the depth of field it was pretty much focus free. I now use ...
Posted by Dangermouse on 07/08/2011 - 02:53
Pentax-M 28mm f3.5 SMC
Mine is lovely, just a shame it doesn't focus correctly and the expense of getting it fixed is similar to a new one. Bret
Posted by bretti_kivi on 07/08/2011 - 09:38
Pentax-M 28mm f3.5 SMC
If it's anything like the other M series lenses then you should be able to fix it yourself without much trouble. If you unscrew the finishing ring around the front element it will reveal some screw heads. If you then loosen these you should be able to adjust the infinity setting. You will need a ...
Posted by Dangermouse on 07/08/2011 - 10:01
Pentax-M 28mm f3.5 SMC
It's very difficult to focus a 24-28mm accurately beyond about 10m. I've done some tests on a wall 22m away at f/5.6 and f/8 both MF and using the green light in the viewfinder and the best way seems to be set the lens to INFINITY (providing it's OK on the camera at infinity). There's very l...
Posted by Algernon on 11/08/2011 - 11:54
Asahi Pentax Takumar 2x KA Teleconverter
The 300mm is on the limit of the design parameters for the converter anyway - you might need an L version for the longer lenses, but then it's back to the full price SMC Pentax converters. The Takumar converter is an S design for shorter lenses, which indeed the low cost range will be.
Posted by johnriley on 07/08/2011 - 11:02
Super zooms
Hi Ian I would not argue with you at all - these shots are far from being bad, in fact IMHO the first shot is very good indeed and the Tammy did a reasonable job given the subjects and distance - I think you probably coaxed the best you are likley to get out of that lens. As you know - I was ...
Posted by fritzthedog on 07/08/2011 - 18:41
Super zooms
Does it really matter? I think we know what Ian was asking - or have I got it wrong Ian? No it doesn't really matter but just wondering. Ian didn't use the term but you did actually and my question was therefore somewhat directed at you. I've used the Sigma 100-300 and that was a very fast lens ...
Posted by Anvh on 07/08/2011 - 21:26
Super zooms
[quote:3496ace15f="fritzthedog"] Ian didn't use the term but you did actually and my question was therefore somewhat directed at you. I've used the Sigma 100-300 and that was a very fast lens to focus, if it works well with a 1.4x converter that one would be great as well although i'm talking in...
Posted by fritzthedog on 07/08/2011 - 22:59
Super zooms
and that 100-300 is definatley on my "one day" list It's on mine too, i thought the DA*60-250 would be able to stand up against it but the IQ of the Sigma is better, the Bokeh is smoother and it focus 4 times as fast, only the build quality is slightly less. I wonder how the Sigma 120-300 f/2.8 wil...
Posted by Anvh on 07/08/2011 - 23:27
Super zooms
Well I've recently acquired the Sigma 150-500mm and good as it appears to be I wouldn't want to be pointing at the sky for long. It's blooming heavy!:( Nwver realy thought about the wait and support needed but with spinal damage it looks like I will also have to take this point into consideration a...
Posted by philstaff on 08/08/2011 - 15:13
Super zooms
and that 100-300 is definatley on my "one day" list It's on mine too, i thought the DA*60-250 would be able to stand up against it but the IQ of the Sigma is better, the Bokeh is smoother and it focus 4 times as fast, only the build quality is slightly less. I wonder how the Sigma 120-300 f/2.8 wil...
Posted by philstaff on 08/08/2011 - 15:17
Super zooms
Well I've recently acquired the Sigma 150-500mm and good as it appears to be I wouldn't want to be pointing at the sky for long. It's blooming heavy!:( Nwver realy thought about the wait and support needed but with spinal damage it looks like I will also have to take this point into consideration a...
Posted by Blythman on 08/08/2011 - 16:09
Super zooms
I should have a 1.4x for my 100-300 soon. at 250mm, 1/320, f5 (!!), ISO 125: that's on a Monopod. It really is a heavy thing; it brings the weight of a gripped K5 rapidly towards 3kg. I can do some 100% crops, but to be honest, if you're worried about weight, then the best thing real...
Posted by bretti_kivi on 08/08/2011 - 19:47
Super zooms
Thanks Stefan,Bret and Mike I will check out the Tok Bret suggested. However looking at the shot of the Deer with the pentax and converter this looks a very good option. Would a 1.4 give a better IQ and also how much focal length would I loose compared to a 2x converter. Thinking back to the show I ...
Posted by philstaff on 09/08/2011 - 10:30
Super zooms
the 1.4 / 2x comparison was posted recently by - i think - thoughton - and the 1.4 is slightly better than the 2.x. I'm interested to see how the 100-300 behaves with a 1.4 on the back, as I will have the combo hopefully in a couple of weeks. 100-300 x 1.4 = 140-420mm / f5.6 Bret
Posted by bretti_kivi on 09/08/2011 - 11:21
I am in mourning
Send it to Pentax repair (via SRS) for an estimate. I only say that as a friend of mine had the exact same situation with her Canon 17-40mm lens that dropped on the stone floor at Manchester cathedral with her 5D. Both went off to the repairers and both were repaired (the 17-40 had split in two lik...
Posted by Offertonhatter on 10/08/2011 - 20:37
