Eggplantt

Eggplantt

Joined on Sep 24, 2020
About me:

:-) interested in curious lenses.

Eggplantt's recent activity

  • Aside from your reasoning, have you considered an enlarger lens? Probably the lightest setup you can get for macro work.
  • This is part of an interesting class of earlier telephoto zoom lenses that were a bit faster than what came after. That naturally makes me curious for the chromatic aberration performance given ...
  • Hopefully this is a fair bump- as someone who owns one of these (200mm f/3.5 AF) which is in nice, working condition- I was curious about the structure as an internal-focus 200mm lens. Well, from P ...
  • Well one of the described benefits is (1) Wide well corrected field off axis performance is similar to a Newtonian. CHief correctors contribute very little to the off-axis aberrations.
  • Also- the Makowsky design doesn't count as one of these TCTs as it was merely a cut-out section of an admittedly very fast Cassegrain- obviously making it expensive to produce: Now a TCT such as ...
  • I suppose it's also worth noting some designs, which I can't find right now, can weather quite high tolerance errors. Maybe not off-axis ones though...
  • Imo the argument stops here when it's just so heavy. I have the 200-500mm f6.9 which is okay up to 350mm wide open, but it weighs a tonne. It seems old telephoto zooms a tricky category to get ...
  • Yeah I had a thought that using such a gigantic screen would dwarf any texture pattern seen in people's previous attempts. I would be curious to see a video which continually shrinks the lens ...
  • This thread went in my favourite direction... Note: Alan has more experience here than I do. Alan's mentioned a lot about tolerances, and doublet with folded flats, I will focus on tilted-component ...
  • Replied in 300/5.6?
    I've had an eBay saved search for this for ages- nothing has ever come up :-( :-( :-( :-( I would happily trade my Vivitar 800mm f11 for it, amongst other things.. EDIT: How did I miss out?? More ...
  • Replied in 300/5.6?
    In terms of mirror lens design- I am waiting for someone to combine a telephoto, off-axis tilted component telescope (TCT) design (no donut bokeh) with solid glass lenses to shorten it: Pictured- ...
  • Replied in 300/5.6?
    Lots of posts, where to start? Arguably 100mm refracting lenses are little larger than a typical 50mm prime - see the Olympus for example The equivalent centrally-obstructed Cassegrain mirror lens ...
  • What Prof Hank didn't also mention is these mirror lenses need time to acclimatise to the environment they're shooting in, if it's significantly different to indoors. Try waiting 30-45 minutes and ...
  • Seperate, but maybe related: would be nice if we could adopt angle of view (AOV) to group similar lenses across sensor sizes, and then lens aperture (like in telescopes).

    Perhaps abit alien but...

  • It's probably worth a mention that in the cinema world, a confusing place, people have seemingly settled on sensor height + describing aspect ratio.

    From what I can see it's used to settle matters...

  • Sorry, I can't edit that post now, but for clarity- "Voigtlander has recomputed their rangefinder lens designs to work better on Sony E mount cameras" - but chose not to here , which might explain ...
  • Out of the various 135mm f2.8 lenses tested here I found the Pentacon 135mm f2.8 to be the best balance of price/performance ...
  • This would be an interesting comparison between two lenses. The Adaptall-2 60-300mm was an SP lens, and the Tokina, whilst part of their AT-X line, was more on the consumer end, and (sadly) not ...
  • I agree but if you're not using a full frame digital camera then it's sort of wasted.

    But fast APS-C native mirrorless lenses with the same equivalent depth of field have been produced by...

  • I have been going through Voigtlander catalogs (2016/2019/2021/2022), so hoping I can shed some light- they appear optically identical: E Mount VM Mount The optical design did not change between ...
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