Why no mirror telephotos for DSLR Canon?
Wow - time to get one and either reactivate my minolta film slrs
or buy a sony dslr.
no doubt in-body IS must play a role here, but above all if we consider
how it is possible to AF a f/8 lens using standard PD sensors... it would
mean quite a revolution should Canon decide to build such a f/8 CAT.
There are f/5.6 500mm Rubinars but they are loosing all benefits of
being light and small (Minolta-Sony 600/8 is quite tiny).
I've old 500/8 mirror, bought over 20 yrs. ago - it is a typical no brand,
el-cheapo lens, and yet... when focused carefully it can hold it's own,
even with 2x and 1.4x teleconverters:
all shots taken with 40D, ISO 400 (focused with LV, 550EX sync.at
1/250 sec was used to freeze any motion)
top row (from the left):
1) at the native 500mm f/8,
2) for comparison purposes - EF 300/4L IS + 2x mkII TC (painted black, see just below),
3) cat 500/8 + 1.4x pro300dg of Kenko.
bottom row (from the left):
4) 100% crop of the native 500 f/8,
5) how does 1000mm look like: 500/8 CAT with the 2x mkII and lens hood on 400D, (there is a 12mm ET together with M42 to EF-mount adapter equipped with a confirm chip between the cat, and 2x TC) - notice how small the cat is in comparison to this 2x TC,
6) cat 500/8 + 2x mkII TC;
panels 1-3) and 6) are resized in the same way; so, they can be
compared between all four;
panel 4) is the actual 100% crop of the panel 1) - before resizing
street candids (non-interactive):
music and dance:
wildlife & macro:
Comments and critique are always welcome!
Bill MacBeth wrote:
Here's what I mean by 'eyepiece projection'. I've used the technique many times on my on reflector, and on a larger refractor at a university. An eyepiece (normally used for visual observation) is moved away from the visual focal location, so that it profects a focused image about four inches outside itself. The film plane or sensor plane of the camera is placed at that location. No lens is used on the camera.
Oh. This was used with eyepiece projection through my little Canon S3IS compact, which obviously had a lens on it, with the lens set at maximum wide angle (36mm-equivalent).
This was through the same eyepiece, at maximum telephoto (432mm-equivalent):
(see profile for equipment)
- Canon EOS M58.8%
- Panasonic G85/G803.3%
- Panasonic FZ2500/FZ20001.9%
- Panasonic LX10/LX151.2%
- Panasonic GH5 development3.6%
- Sony a99 II15.9%
- Nikon KeyMission 170 and 801.0%
- Fujifilm GFX 50S development28.3%
- Olympus E-M1 II development18.7%
- Olympus E-PL80.1%
- Olympus 25mm F1.2 Pro1.5%
- Olympus 12-100mm F4 IS Pro1.9%
- Olympus 30mm F3.5 Macro0.1%
- Sigma 85mm F1.4 Art3.6%
- Sigma 12-24mm F4 Art2.6%
- Sigma 500mm F4 DG OS HSM Sport2.4%
- YI M12.2%
- GoPro Hero50.8%
- GoPro Karma drone2.2%
|Sunflower Field by GrannyMeg|
from An impressionist piece
|Flag from Staten Island Ferry by wam7|
|Windswept juniper by Kreber|
from Wind power
|SAND SCULPTURE by duskman|
from Landscape - Black and White #4