Search results for 'back focus' - page 1031
Weird Ricoh AF 50mm Lens
Has anyone ever come across one of these before: Is it a) compatible with Pentax DLSRs? b) likely to need repair, or is the infinity focus down to the seller missing something? c) any good?
Posted by graevy on 23/02/2012 - 20:10
Weird Ricoh AF 50mm Lens
I think you may have difficulty mounting it on a Pentax DSLR, since the focus mechanism looks as if it will be obstructed by the viewfinder/flash. I have a Vivitar mirror lens that I can only mount on extension tubes for the same reason. In answer to your other questions: b) I don't know h...
Posted by sorted78 on 23/02/2012 - 20:59
Weird Ricoh AF 50mm Lens
It doesn't appear to have the Ricoh Kr connection which suggests it's really old (I can't think of a reason why they'd omit it). As sorted mentioned it'd probably foul the pentaprism of my K-5 (do all Pentax DSLR prisms overhang the mount?), but might fit the 'M' cameras whose prisms are flush with ...
Posted by johnha on 24/02/2012 - 00:16
Decision made about Pentax FA* 300mm f2.8
Cheers Mike.I used to have the Pentax AF 1.7x converter too that I used with a Sigma 500mm f4.5. I found it didn't perform too well with the 1.7x on and instead tended to use the 1.4x most of the time. Sold both the Sigma lens and the 1.7x a few years back before I got the 300mm, as I only really us...
Posted by genesisphil on 24/02/2012 - 11:51
Decision made about Pentax FA* 300mm f2.8
It was sold a while back
Posted by Mike-P on 28/07/2013 - 23:08
SDM Lenses
My 300 failed and was sent back for repair under warranty. Now works but not as fast as it used to!
Posted by walkeja on 25/02/2012 - 11:44
SDM Lenses
No problems (other than wishing they would focus a bit quicker) with 16-50, 50-135, 60-250 and 55. Regards George
Posted by carmagw on 25/02/2012 - 13:58
SDM Lenses
My experience with SDM lenses has not been all positive, in fact they are the least reliable of all my lenses (which are mainly Pentax, with a couple of Sigmas, a Tamron and a Samyang). I have not experienced SDM failure but both my SDM lenses (17-70 and 16-50) sometimes fail to lock focus even in v...
Posted by smudge on 25/02/2012 - 15:50
SDM Lenses
I have had 30 year old Pentax lenses (Manual Focus) that were still a pleasure to use, the focusing being so smooth.But I don't think my DA* 16-50 or DA* 50-135 will still be Autofocusing in 30 years time,I have my fingers crossed that I get 3 years trouble free, the 16-50 had to go back to Pentax t...
Posted by Still27 on 25/02/2012 - 18:55
SDM Lenses
Bill has a point about modern lenses being incredibly complex compared with manual focus ones. This applies to all marques of course, but I don't expect the lenses to survive as AF ones in quite the same way as lenses of 40 years ago have. However, even after motors have worn out they may still ...
Posted by johnriley on 26/02/2012 - 00:20
SDM Lenses
Nice to hear that plenty of users here have SDM lenses that work well and don't actually have issues! What happens if they do go wrong though? Does the focus jam, or anything else stop working, or can they still be used fully functionally minus having to focus manually?
Posted by Spaceman_Spiff on 27/02/2012 - 12:04
SDM Lenses
From information posted elsewhere on the net, if SDM stops working the lens can continue to be used as a manual focus lens on any digital Pentax camera. If you have a K10D or earlier camera you may be able to make the lens work as a screw drive focus lens. To do this on a K10 you have to uninstall...
Posted by Ed110 on 27/02/2012 - 21:39
SDM Lenses
I wouldn't worry too much, any teething problems will be way behind us by now. However, there are some lenses that are SDM only and they will only manually focus with pre-K10D with firmware 1.03 camera bodies. The 17-70mm is one. They are designated mount KAF3.
Posted by johnriley on 28/02/2012 - 07:54
Dilemma, 150-500 lens or superzoom.
If you have the funds available I would buy the 150-500. If you can find a good second hand one you will almost certainly get you money back selling it when you get home.
Posted by apeksdiver on 25/02/2012 - 19:23
Pentax SMC DA 55-300mm F4-5.8 ED Lens
The Greenfinch I posted this week in my portfolio is the same lens at 300mm (equivalent to 450mm on a 35mm size sensor) from about three metres away in our garden. The robin before it is at about six metres away in our local reservoirs park. I don't tend to use at 55mm as my standard 18 - 55mm ki...
Posted by wvbarnes on 26/02/2012 - 11:54
Which one should I keep?
For me it depends how important using the Tamron on another system would be, or which mount(s) you have for it. For a DSLR a 'KA' mount is preferable but I also have the 'KM' mount which repeats the aperture scale in the right place to show up in the finder of an MX/LX. The Pentax will focus the ...
Posted by johnha on 26/02/2012 - 12:47
Which one should I keep?
Sell them both and get one of the Vivitar Close Focus varieties. :D
Posted by rparmar on 27/02/2012 - 00:40
Which one should I keep?
Sell them both and get one of the Vivitar Close Focus varieties. :D I have one of those but prefer my K28/3.5. K.
Posted by womble on 27/02/2012 - 12:52
Which one should I keep?
Sell them both and get one of the Vivitar Close Focus varieties. :D I have one of those but prefer my K28/3.5. K. Who wouldn't? :-) It's probably Pentax's best 35mm. But almost as rare as hen's teeth. G
Posted by George Lazarette on 27/02/2012 - 13:39
Which one should I keep?
[quote:3496ace15f="rparmar"]Sell them both and get one of the Vivitar Close Focus varieties. :D I have one of those but prefer my K28/3.5. K. Who wouldn't? :-) It's probably Pentax's best 35mm. But almost as rare as hen's teeth. G[/quote]I think you will find that it is hens' teeth.
Posted by greynolds999 on 27/02/2012 - 13:58
