Mist

by Jakub

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6,368 reputation
1022
bio website
location Oslo, Norway
age 44
visits member for 4 years, 6 months
seen 18 hours ago

Software engineer, hobby photographer and model-builder.


Jun
6
comment What difference is there between the 50mm in a zoom lens, a 50mm prime lens, and a 50mm macro?
A 50mm prime will tend (yes, tend) to have a larger max aperture than a zoom. But this is not an inviolate law of nature. 50-150mm f/2.8 zooms do exist, and I happen to own a 50mm f/3.5 prime! It is quite a tiny lens however, and the 50-150mm is a big one.
Jun
3
reviewed Approve If the zoom number doesn't tell me magnification, what does?
Jun
1
reviewed Approve Why does this article say that a 1.5× crop factor sensor is 43% smaller than a 35mm film cell?
Jun
1
reviewed Approve Canon EOS 70D frozen suddenly?
May
21
reviewed Approve Can add-on lenses for mobile phone cameras improve the image quality?
May
13
reviewed Approve Photographing a waterfall but also have a person in foreground
Mar
11
comment What extender can I use with the Canon TS 24mm?
Ah, this is surprising... I haven't looked at the rear of my 24 TS/E mk I in a while, it never occurred to me that it might have room for a Canon converter!
Mar
11
answered What extender can I use with the Canon TS 24mm?
Feb
26
comment What vintage mechanical camera looks like the Fuji x20?
A word of warning about the light-meters on such old cameras: They tend to be designed for use with mercury batteries, such as PX13 or PX625, which are (for obvious reasons) not easy to get hold of these days. A modern battery, even if it has the same voltage, is NOT a drop-in replacement for one of these, the light-meter readings will be off, and in a non-linear manner. Adapters ("MR-9") to let you use modern batteries are available, fortunately, but may cost more than the camera.
Jan
25
awarded  Yearling
Dec
3
answered What is the purpose of the little metal cylinder the focus ring of certain FD lenses?
Sep
24
awarded  Autobiographer
Sep
12
comment Clear container to take photographs through
Polarizers are not 100% effective, unfortunately, although it can get a LOT better with one. However, to get the reflection-reducing effect at all you have to shoot at a particular angle to the reflecting surface plusminus not a lot. It is not a panacea.
Sep
10
comment Why do macro lenses have such recessed front elements?
...and consider what would happen if the inner and outer tubes were much shorter and the lens elements were in the same position as they are today. At minimum extension it would not matter much, but at maximum extension the structure would inevitably be kinda wobbly. Plastic is cheap, so why go there...
Sep
10
comment Why do macro lenses have such recessed front elements?
I agree with Imre... look at the photos in the question of the 90mm macro at minimum versus full extension. At full extension, the front element is located somewhere around the end of the fixed part of the lens housing, well supported by the lens structure. The excess bits of plastic in the inner tube in front of the front element seem to be there simply as padding to keep everything nicely aligned when the lens is at minimum extension, when the front element is very close to the camera body.
Aug
21
answered Low light photography with lens limitation
Aug
21
comment Focusing Screen for a Canon 60D using an 85mm f1.2 lens
Probably wise... I can't help you there, I do have an 85/1.2L (mark one) but am using it on a full-frame 1DsII with the Canon super precision matte screen. I do rely on autofocus, the 85L is painfully slow to focus in manual mode. Not that it is pleasantly fast to autofocus either of course :)
Aug
20
revised Focusing Screen for a Canon 60D using an 85mm f1.2 lens
Corrected wordage.
Aug
20
answered Focusing Screen for a Canon 60D using an 85mm f1.2 lens
Jul
23
awarded  Nice Answer