Search results for 'back focus' - page 806
Canon to Pentax converter
There is a 645 convertor but they aren't cheap and remember you will have no auto focus or iris - manual everything! A 400mm lens is a 400mm lens no matter what format.
Posted by gartmore on 25/08/2009 - 12:17
Canon to Pentax converter
Both the 645 and 67 lenses are designed to cover a larger film area than 35mm so the effect that you'll see is similar to using lenses designed for 35mm on digital cameras - in other words you'll be using the central "sweet spot" of the lens (a good thing!) with the drawback being that the lens is l...
Posted by hefty1 on 25/08/2009 - 14:39
Whats the difference
Were there equally definitive definitions for formats bigger than 35mm? Generally speaking folk who use larger format, from 6x6cm through to 10x8in cameras are experienced, probably mostly professionals. Professionals generally just talk in terms of focal length, in 35mm, digital or any other f...
Posted by lemmy on 26/08/2009 - 17:45
Whats the difference
Professionals generally just talk in terms of focal length, in 35mm, digital or any other format, since when you are using camera equipment every day you will know their relationship to format size. For example, I'd often hear 'can I borrow your 250 for the Hassel'. I've never heard 'Can I borrow...
Posted by ChrisA on 26/08/2009 - 19:09
Whats the difference
No not really Danny. Telephoto In photography and cinematography, a telephoto lens is a lens where the focal length is significantly longer than the focal length of a normal lens. For a 35 mm camera with a 24 by 36 mm format, the normal lens is 50 mm and a lens of focal length 70 mm or more is c...
Posted by Anvh on 26/08/2009 - 20:03
Whats the difference
I've also heard 'long focus' used in reference to plate cameras but these are actually long focus rather than telephoto. What's the difference between these? A long focus 500mm lens will have 500mm back focus but a tele will have a shorter back focus making it more compact. The long focus lens ne...
Posted by lemmy on 27/08/2009 - 16:01
Found lenses!
I have just been in my storage cupboard and found some more lenses. 1. A vivitar 80-200mm 1:4.5 macro zoom with a 2x tele converter Pentax pk mount. 2. A Tamron Adaptall 2 SP 52A 70-210mm with macro, this lens has a Minolta mount. 3. A focal 2.8-70mm macro with a 2x auto teleplus converter, also...
Posted by bresail on 26/08/2009 - 18:23
Most lenses of one focal length ?
I think I can go close Let me see 55mm 1.8 Tak 50mm 1.4 Tak 50mm M 4.0 macro 50mm M 1.7 50mm A 2.0 x 3 Not sure where all these came from :roll: 50mm FA 1.4 Hmmm that makes 8, Oh well back in the draw they go :lol:
Posted by Clarky on 27/08/2009 - 10:18
Most lenses of one focal length ?
I agree with the evaluation of the Pentax A 28/2.8 as being unspectacular. In fact, I think a mark of 7 might be generous. The Komine made Vivitar K01 and K02 deserve my highest praise. The K03 is right up there but does not focus as closely. The Kiron-made K11 and it's Kiron equivalent f/2 are a...
Posted by rparmar on 28/08/2009 - 11:56
Most lenses of one focal length ?
back on topic - I think I can claim the prize for the 50mm cleptomania (or is it sad old b****r)- I have 17 M F1.4 x 3 M F1.7 x 5 M F2 x 4 A F1.7 x 2 A F2 x 1 M F4 x 1 all on LX, Super A and other bodies in my collection (except the 50mm F4 macro) (and if you add in 55mm, can add a...
Posted by Steve Chasey on 28/08/2009 - 23:14
Most lenses of one focal length ?
back on topic - I think I can claim the prize for the 50mm cleptomania (or is it sad old b****r)- I have 17 Kleptomania? I have Kleptomania, but I'm taking something for it. Sorry, I couldn't resist. :wink:
Posted by Lance B on 29/08/2009 - 02:37
Tamron Adaptall mount - DIY repair?
Hi John thanks for the reply. I did have a brief go at removing screws, starting with the tiny tiny tiny silver ones which stick out of the side of the mount (they protrude about 1 mm from the curved part of the mount). I removed both of them but it didn't seem to loosen anything! I then lost my ner...
Posted by thoughton on 27/08/2009 - 15:55
Tamron Adaptall mount - DIY repair?
On the PK mount there's only one spring associated with an arm/roller. I don't know whether the contacts on the PKA mount are spring loaded? I didn't lose the spring, but you do need to ensure you put the spring back correctly. I did on the second attempt! I just took my time; lots of notes a...
Posted by JohnX on 27/08/2009 - 19:21
Scarce as Chicken's Teeth
Easy, it's in a big case under the bed. :lol: Sorry, couldn't resist. The K 500mm is a fine lens and much better balanced on a tripod than the 135-600mm ever was. The tripod collar is much better placed on the 500mm and when you change focus, the lens barrel extends and contracts on both sides...
Posted by Mannesty on 27/08/2009 - 22:27
Scarce as Chicken's Teeth
I have the 400mm but haven’t used it since getting a DA* 300mm – it was too difficult to focus accurately with the K10 (how I miss the superb viewfinder on my LX). Now my K7 has arrived I will dig it out again, if it ever stops raining here and brightens up. :roll:
Posted by Dave_Evanson on 28/08/2009 - 11:12
help: dropped a lens, what can i do
I feel stupid and quite annoyed. I dropped my Pentax 100 D FA macro lens. The glass seems to be intact and still working but the focus ring is really really stiff. I think there is a dent on the focus ring that is causing a lot of friction. I have taken a few pictures after I dropped it so it see...
Posted by ericp on 30/08/2009 - 19:01
help: dropped a lens, what can i do
I feel stupid and quite annoyed. I dropped my Pentax 100 D FA macro lens. The glass seems to be intact and still working but the focus ring is really really stiff. I think there is a dent on the focus ring that is causing a lot of friction. I have taken a few pictures after I dropped it so it see...
Posted by Tooks on 30/08/2009 - 19:38
help: dropped a lens, what can i do
I have a Tamron 24-135mm AF SP which was my first ever lens purchase and while I was living in Spain I put it on a table next to the window. We had a terrible stormy day, the wind caught the wooden shutter which in turn wacked the lens for 6 onto a hard tiled floor. I sent it off to the UK Tamron...
Posted by Mike-P on 30/08/2009 - 19:54
help: dropped a lens, what can i do
Thank you all for your help and advice. Who do I contact to have the lens repaired? Is it better to go through SRS say or direct to Pentax? I just want to get a quote as I would be happy to pay at most £50 say. If you go onto the Pentax web site it will give you all the details to have a repair...
Posted by Mike-P on 30/08/2009 - 21:02
help: dropped a lens, what can i do
Thank you all for your help and advice. Who do I contact to have the lens repaired? Is it better to go through SRS say or direct to Pentax? I just want to get a quote as I would be happy to pay at most £50 say. If you go onto the Pentax web site it will give you all the details to have a repair...
Posted by ericp on 30/08/2009 - 21:48
