Search results for 'back focus' - page 1115
Focusing fast lenses wide open.
It is absolute fact that recomposing will move the plane of focus off your subject, but only at the close distances I am talking about. i.e. sitting next to your child at the table or macro work. The example from your manual is so far away it would not be affected by recomposing. Yes if its a close...
Posted by JAK on 12/12/2013 - 11:35
Focusing fast lenses wide open.
Ok - I get it for close stuff, but for general use it's the technique I use most of the time. Recomposing usually consists of moving the camera (with my eye against the viewfinder) sideways by a couple of inches - I wouldn't have thought this would have any significant impact on the focus plane?
Posted by LennyBloke on 12/12/2013 - 11:56
Focusing fast lenses wide open.
It doesn't have any relevant effect LennyBloke, unless we are at macro lens distances. The loss of focus will be much more likely to be camera and subject movement as we recompose. This only matters when using very wide apertures, but with lots of practice the success rate will increase.
Posted by johnriley on 12/12/2013 - 12:32
Focusing fast lenses wide open.
It doesn't have any relevant effect LennyBloke, unless we are at macro lens distances. The loss of focus will be much more likely to be camera and subject movement as we recompose. This only matters when using very wide apertures, but with lots of practice the success rate will increase. Dammmmm ...
Posted by LennyBloke on 12/12/2013 - 12:41
Focusing fast lenses wide open.
You can see it happening in the viewfinder. You have to move back and forth to re-establish focus. Whether that is because of movement of the camera, or the focal plane (or whatever) shifting because the camera was moved in an arc, is largely irrelevant. The fact is the subject has gone out of focus...
Posted by Darkmunk on 12/12/2013 - 13:38
Focusing fast lenses wide open.
Some heretical thoughts : The stock Pentax viewfinder screen is really cr*p with lenses faster than about f2.8. A cut down Canon Ee-s screen makes all the difference. I've always used centre focus and recompose - old habits die hard. I could never see the point of having dozens of AF focus poi...
Posted by kh1234567890 on 12/12/2013 - 13:41
Focusing fast lenses wide open.
For testing it's worth trying out the Live View. That shows exactly what's hitting the sensor - so is helpful in checking what the lens can actually do ;) Once you have that referenced you can work from there... and possibly add in some focus adjustment to correct the phase detection autofocus an...
Posted by MattMatic on 12/12/2013 - 13:53
Old Pentax K-Bayonet lenses on new digital bodies?
I was correcting the (as saw it) overly negative impression your previous post was giving about using manual lenses. You mentioned 'faffing around' on a Canon, I just wanted to stand up for what I see as the special value, and excellent functionality, we are lucky to have with our manual lenses. ...
Posted by Gamka on 12/12/2013 - 19:49
Old Pentax K-Bayonet lenses on new digital bodies?
Exactly. Mount the lens, set to Manual metering, select aperture, focus, press green button to set exposure and CLICK. Not much "faffing around" in that process. :D :? :wink: Yeah, piece of cake! But in reality, the only item you list there that is extra to autofocus operation is : ' press...
Posted by McGregNi on 12/12/2013 - 20:16
Old Pentax K-Bayonet lenses on new digital bodies?
As well as Pentax not making a FF camera at the moment the lenses cannot be used on a Canon due to the aperture lever which will hit the mirror of a FF body. As for your lenses, there is probably less than £100 worth in total. To use them on your 500D do a search on Ebay for a K-mount to EF adapt...
Posted by Mike-P on 12/12/2013 - 23:38
Old Pentax K-Bayonet lenses on new digital bodies?
Re-reading this thread reminded me to dig out an old manual Chinon 50mmm F1.7 like (bought mine with a Chinon CE5, which is the only K-mount film body I still have). Seems quite reasonable, and certainly pretty much as sharp at F2.0 as the 18-135 is wide open at the 50mm setting in low light/cl...
Posted by jeallen01 on 23/12/2013 - 18:58
Macro on a budget?
I am wanting to have a bash at macro photography but cannot afford too much. I recently bought the manual focus 50mm f2.8 Macro lens and I really like it but it isn't true macro, it's only 1:2. I bought a Vivtar teleconverter but the resulting photos don't seem as sharp as they could be. What ...
Posted by Daydreamjay on 12/12/2013 - 17:13
Macro on a budget?
Tubes? What's that then? Basically a tube? Does it harm IQ? I don't mind using an manual focus lens as I am used to it.
Posted by Daydreamjay on 12/12/2013 - 17:22
Macro on a budget?
these were done using a Teleplus x2 Macro converter that gives 1:1 with a 50mm lens, i used an FA50 f1.7. the converter is PK fit so no electrical contact with camera but works a treat with catch in focus. it was a breezy day so they were not happy flying for long periods and landed frequently.
Posted by redbusa99 on 12/12/2013 - 18:23
Macro on a budget?
You can not compare tubes with tele converters. Tubes do not degrade the image at all, because no extra glass is involved. With tubes you can easy get 1:1 or even 0.1:1 but you loose a fair amount of light. You then have problems with hand held shots. Also normally the 50mm F1.4's and 1.2's are n...
Posted by Horst on 13/12/2013 - 12:50
Telephoto Lens
Hi everybody. have just come back to photography having been given a K10D. I am currently using this with a SMC DA 18-55mm lens, but would like to add a lens to extend my focal range. I do not have a specific subject I photograph and am on a pretty limited budget of about £120. Am probably being ...
Posted by Bluey on 13/12/2013 - 11:37
Telephoto Lens
What he ^ said. Cracking lens, pretty sharp, quick focusing and great for close-ups and portraits. Lovely creamy bokeh (out of focus areas). It suffers from purple fringing in high contrast, but there's a simple fix for that - just ask here.
Posted by Darkmunk on 13/12/2013 - 11:57
Telephoto Lens
Couldn't agree more: you can take some great shots with this lens. However, it is quite bulky. The Pentax 50-200 is obviously not as long, but it's amazingly compact and very nicely made. I'm not sure of its close focus ability, though.
Posted by bwlchmawr on 13/12/2013 - 21:17
Telephoto Lens
I would stick with the smallest zoom range as the longer it gets the worse it can be as a rule:D 18 to 200 or 18 to 270 lenses have the convenience but I am told the image quality is the trade off, basically the larger the differences between the higher and lower figure the more challenging the l...
Posted by Stuey on 14/12/2013 - 10:51
Using UV Filters
That's a sort of summing up from ChrisA, but to be fair there are those who have experienced filters fragmenting and damaging front elements. I'm not sure that anyone who uses a hood has damaged an unprotected front element. Just thinking back to around 1978 ... two of us were doing a series cover...
Posted by Gamka on 16/12/2013 - 12:25
